1.28 Cardiac Pathophysiology

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Questions and Answers

According to the CDC, heart disease is the leading cause of death for which groups in the United States?

  • Women only
  • Both men and women (correct)
  • Men only
  • Children under 10

Which of the following is a key characteristic of atherosclerosis?

  • Nodular deposits of fatty material (correct)
  • Thinning of arterial walls
  • Reduced blood pressure
  • Increase in arterial elasticity

Which of the following best describes the relationship between CAD and CHD?

  • CAD is caused by CHD
  • CHD is caused by CAD (correct)
  • CAD and CHD are unrelated
  • CAD and CHD are the same

What is meant by the term 'sclerosis' in the context of atherosclerotic heart disease?

<p>Hardening (A)</p>
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Which of the following is considered a modifiable risk factor for coronary artery disease (CAD)?

<p>Tobacco use (B)</p>
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What is the primary role of cholesterol in the body?

<p>As an essential compound (D)</p>
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HDL cholesterol is often referred to as 'good' cholesterol because it:

<p>Protects against CHD (A)</p>
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What is the significance of the LDL:HDL ratio in assessing cholesterol-related blockages?

<p>Provides a composite risk marker (A)</p>
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Which of the following is the earliest detectable lesion in the development of atherosclerosis?

<p>Fatty streak (C)</p>
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In the context of myocardial ischemia, what triggers increased oxygen demand?

<p>Exercise (C)</p>
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Which assessment finding is a classic symptom of ischemia?

<p>Pressure or heaviness (A)</p>
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Which situation typically characterizes chronic stable angina?

<p>Associated with exertion (C)</p>
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Unstable angina is characterized by:

<p>Chest pain at rest (C)</p>
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Which type of angina occurs almost exclusively at rest due to coronary artery spasm?

<p>Prinzmetal's angina (D)</p>
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What crucial change occurs on an EKG during myocardial ischemia?

<p>T wave inversion (C)</p>
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Which of the following defines myocardial infarction (MI)?

<p>Interruption of blood supply (A)</p>
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Following a myocardial infarction (MI), approximately how long does it take for a weak fibrotic scar to form?

<p>10-14 days (B)</p>
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Which of the following is characteristic of subendocardial MI but NOT transmural MI?

<p>ST-segment depression (D)</p>
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Which of the following criteria must be present to diagnose an MI? (Select at least 2)

<p>Rise of cardiac enzymes (B), Anginal symptoms (D), EKG Changes (E)</p>
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Which cardiac enzyme is highly cardiac specific and therefore the preferred marker for detecting myocardial damage?

<p>Troponin (C)</p>
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Which of the following best describes cardiac/ventricular remodeling?

<p>Changes in heart physiology (C)</p>
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What causes cardiac muscle pump dysfunction?

<p>Cardiac muscle dysfunction (D)</p>
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What is a key characteristic of heart muscle pump failure?

<p>Leads to a decrease EF (C)</p>
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Which condition is defined as the heart's inability to pump enough output to meet the body's metabolic demands?

<p>Congestive Heart Failure (A)</p>
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Which set of symptoms are characteristics of CHF?

<p>Dyspnea and peripheral edema (A)</p>
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What is the Frank-Starling mechanism in the context of diastolic heart function?

<p>Ventricular filling (A)</p>
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An overall finding typically exists with diastolic heart failure:

<p>Elevated diastolic pressures (D)</p>
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In the context of heart failure, what is meant by 'HFrEF'?

<p>Heart failure with reduced ejection fraction (B)</p>
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Pulmonary and systemic venous congestion are characteristic of:

<p>Left sided heart failure (B)</p>
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If a patient has jugular venous distension (JVD), liver engorgement, ascites, and peripheral edema, where is the heart failure?

<p>Right-side (C)</p>
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What is the effect of increased levels of circulating arginine vasopressin in heart failure?

<p>Vasoconstriction (C)</p>
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Which of the following is a compensatory system for CHF?

<p>Autonomic System (B)</p>
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What is the overall goal when treating CHF?

<p>Reduce workload (A)</p>
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Which of the following best describes the primary characteristic of cardiomyopathy (CM)?

<p>Changes of the myocardium (C)</p>
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What distinguishes dilated cardiomyopathy (DCM) from other types of cardiomyopathy?

<p>Increase in ventricular size (A)</p>
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A patient presents with cardiac symptoms and is found to have considerable cardiac mass. What condition could this be?

<p>Hypertrophic CM (B)</p>
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A lack of ventricular filling would lead to this type of CM:

<p>Rigid ventricular walls (D)</p>
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What is the focus of treating valve disease?

<p>Reduce workload (B)</p>
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A patient's blood flow is going in more than one direction and you identify the valves are not closing properly, what is this valve dysfunction?

<p>Insufficient (B)</p>
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Which valvular condition is most associated with the aorta?

<p>Aortic Insufficiency (B)</p>
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What is a key indicator of structural heart defects?

<p>Electrical abnormalities (A)</p>
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Localized dilatation and weakening of the wall of a blood vessel is what condition?

<p>Aneurysm (B)</p>
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If damage is impacting the aorta near the valve what area is directly impacting the aorta?

<p>Ascending aorta (A)</p>
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A tear distal to the left subclavian atery would lead to what outcome?

<p>Aggrssive drug therapy (C)</p>
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What is a rare condition of the heart from typically a bacterial infection?

<p>Endocarditis (B)</p>
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A potential life threatening cause of the heart that results in excess fluid around the heart is:

<p>Cardiac Tamponade (D)</p>
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A hemangiosarcomas results in what condition?

<p>Malignant Tumors (A)</p>
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Which of the following statements is most accurate regarding the relationship between elevated cardiac troponin levels and myocardial injury, based on the NYP Algorithm for High Sensitivity Troponins?

<p>The level must always be interpreted in conjunction with a detailed clinical assessment that considers risk stratification and potential alternative diagnoses. (D)</p>
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According to the CDC, approximately how often does someone in America die from heart disease?

<p>1 in 5 deaths (B)</p>
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What is the most common type of heart disease?

<p>Coronary heart disease (C)</p>
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Which of the following describes 'athero' in the term 'atherosclerosis'?

<p>Gruel-like, soft deposit (D)</p>
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What is the primary characteristic that defines 'sclerosis' in the context of atherosclerosis?

<p>Hardening of the arteries (C)</p>
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Which of the following scenarios would cause myocardial ischemia?

<p>Increased myocardial oxygen demand (A)</p>
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What is the underlying cause of Prinzmetal's angina?

<p>Coronary artery spasm (A)</p>
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Which of the following is a typical symptom that women reporting with myocardial infarction (MI)?

<p>Unusual fatigue, sleep disturbances, and indigestion (C)</p>
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Which EKG change is commonly associated with myocardial ischemia?

<p>T wave inversion (C)</p>
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A patient is diagnosed with a NSTEMI. Which of the following is true about this classification of MI?

<p>It represents an acute injury to the myocardium that does NOT extend through the full thickness of the wall. (B)</p>
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Which of the following best describes Type 2 MI?

<p>Myocardial ischemia due to oxygen supply-demand imbalance (B)</p>
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Per the information presented, at least how many criteria must be present to diagnosis an MI?

<p>2/3 (A)</p>
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Following an MI, what type of tissue forms the scar?

<p>Fibrotic (A)</p>
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A patient is experiencing heart muscle dysfunction. What manifestations may result from this?

<p>Congestive Heart Failure (CHF) and/or Cardiomyopathy (CM) (B)</p>
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What does the Frank-Starling mechanism refer to in the context of diastolic heart function?

<p>The relationship between ventricular end-diastolic pressure and ventricular contraction. (C)</p>
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A common manifestation of right-sided heart failure is the presence of jugular venous distension (JVD). What is the underlying cause?

<p>Increased right atrial and venous pressure (B)</p>
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In which type of heart failure would one typically observe pulmonary and systemic venous congestion?

<p>Left-sided heart failure (C)</p>
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What is the difference between compensated and decompensated heart failure?

<p>Compensated heart failure refers to a stable state where symptoms are controlled, while decompensated heart failure involves worsening symptoms and abnormalities. (A)</p>
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What is the purpose of non-drug interventions in the treatment of CHF?

<p>Manage sodium and water retention (A)</p>
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What is meant by the term 'cardiac remodeling'?

<p>Changes in the size, shape, structure, and physiology of the heart after injury. (A)</p>
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Which of the following describes the ventricular changes that occur with ventricular remodeling?

<p>Changes from elliptical to spherical (B)</p>
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Which compensatory mechanism is triggered by decreased cardiac output and leads to increased heart rate and contractility?

<p>SNS (Sympathetic Nervous System) (B)</p>
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With the Renin-Angiotensin-Aldosterone System(RAAS) which of the following is TRUE?

<p>Increases renin release (C)</p>
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A patient presents with low cardiac output and fluid retention. Elevated level of circulating arginine vasopressin is suspected. Which is true about this suspicion?

<p>It could be a contributing factor. (C)</p>
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A patient with heart failure has increased levels of natriuretic peptides. What effect do these peptides have that makes it a beneficial compensatory mechanism?

<p>Vasodilation and increased sodium and water excretion (B)</p>
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What is the main difference between systolic and diastolic heart failure?

<p>Systolic heart failure involves problems with ventricular contraction, while diastolic involves problems with ventricular filling. (D)</p>
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A patient has a decreased stroke volume and afterload is increased. What classification of HF is this?

<p>Increased Afterload (D)</p>
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What causes a decreased filling of the left ventricle due to increased stiffness in diastolic heart failure?

<p>Decreased End Diastolic Volume (EDV) (A)</p>
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Which characteristic is associated with left ventricular failure?

<p>Pulmonary edema (A)</p>
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In which type of cardiomyopathy does considerable cardiac mass occur without ventricular dilation?

<p>Hypertrophic cardiomyopathy (HCM) (C)</p>
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Which of the following best describes Restrictive Cardiomyopathy (RCM)?

<p>Restrictive filling due to endocardial or myocardial disease. (A)</p>
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Which best describes a heart afterload?

<p>The resistance against which the ventricles must pump blood (D)</p>
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What is the main goal when treating of valvular heart disease?

<p>Reducing severity of symptoms (B)</p>
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What finding is most often associated with mitral valve prolapse?

<p>Audible click (D)</p>
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A sudden cardiac death most directly results from what event?

<p>Cardiac arrest due to a fatal arrhythmia (D)</p>
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What causes a localized dilatation and weakening of the blood vessel wall?

<p>Aneurysm (A)</p>
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In an endocarditis diagnosis, what causes the inflammation?

<p>Microbial infection (A)</p>
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A patient presents complaining of mid-abdominal or low back pain. Rupture of what condition would be indicated by severe back or abdominal pain?

<p>Aneurysm (C)</p>
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Pericarditis has several symptoms, what can it progress to?

<p>Pericardial effusion (C)</p>
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What is considered rare and can be healed with surgery of an abnormal growth?

<p>Cardiac Tumors (A)</p>
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Which of the following would most likely to have a worse response of arterial pulse due to prior circulatory collapse?

<p>Arrythmia (B)</p>
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Which of the following statements is TRUE regarding aortic aneurysms?

<p>Dissections distal to the left subclavian artery are often managed with aggressive drug therapy. (C)</p>
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A patient is diagnosed with heart failure and their EF correlates with exercise. What type of CHF is this?

<p>Musculoskeletal (C)</p>
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An experimental drug selectively inhibits the release of aldosterone. What effects would such a drug be expected to have on a patient with CHF?

<p>Decreased sodium retention and decreased blood volume (D)</p>
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A patient has been diagnosed with CHF, and an echocardiogram reveals an enlarged heart, pulmonary edema, and signs of both systolic and diastolic dysfunction. Which NYHA class best describes this patient's condition if they are significantly limited in physical activity and experience symptoms even at rest?

<p>Class IV (D)</p>
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According to available research, approximately what percentage of total CVD deaths are attributable to coronary heart disease in the US?

<p>40.3% (D)</p>
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Which of the following correctly describes the composition of a fatty streak?

<p>Mixture of foam cells and lipids in the subendothelial space. (C)</p>
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Which of the following statements accurately describes the role of hypertension in the development of atherosclerosis?

<p>Hypertension increases the risk of atherosclerosis by promoting endothelial injury and dysfunction. (D)</p>
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What is the clinical significance of elevated levels of triglycerides in relation to cardiovascular risk?

<p>High triglycerides are associated with increased cardiovascular risk, especially when combined with other risk factors. (D)</p>
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According to the provided information, what LDL:HDL ratio would correlate to lower risk?

<p>Less than or equal to 3:1 (D)</p>
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Which statement accurately contrasts stable and unstable angina?

<p>Stable angina is predictable and relieved by rest or nitroglycerin, whereas unstable angina is new, worsening, or occurs at rest. (A)</p>
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A patient reporting chest pain described as "pressure" or "heaviness" is most indicative of which condition?

<p>Classic symptom of ischemia (A)</p>
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Under what circumstances does Prinzmetal's angina typically occur?

<p>Almost exclusively at rest, often due to coronary artery spasm. (A)</p>
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What is the primary mechanism by which cocaine use can induce myocardial infarction (MI)?

<p>Leading to severe vasoconstriction (B)</p>
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After an MI, at what time does visible necrosis present?

<p>Within 2-4 days s/p MI (B)</p>
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How does subendocardial MI differ from transmural MI in terms of EKG findings?

<p>Subendocardial MI demonstrates ST-segment depression, transmural MI shows ST-segment elevation, and it indicates a full thickness injury. (B)</p>
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According to the NYP Algorithm for high sensitivity troponins, if a patient presents with symptoms suggestive of NSTEMI has an initial troponin level of ≤ 2 ng/L what risk is indicated?

<p>Low risk (D)</p>
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What is the primary goal of treatments like Beta Blockers for an MI?

<p>Reduce myocardial oxygen demand (C)</p>
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Which of the following best describes the underlying cause of heart failure?

<p>Impairment in the heart's ability to pump and/or accept blood. (C)</p>
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What mechanisms are true about compensation for CHF?

<p>Sympathetic Nervous System, RAAS and Natriuretic Peptide Counter-regulatory system (A)</p>
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A patient with right ventricular failure is MOST LIKELY to exhibit which of the following signs and symptoms?

<p>Dependent edema, liver engorgement, and ascites (B)</p>
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How would one categorize a patient with considerable cardiac mass without ventricular dilation?

<p>Hypertrophic cardiomyopathy (A)</p>
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A patient's chart indicates the finding of valvular insufficiency. What will also be true about this patient's symptoms?

<p>The valve leaflets do not close properly and allow backflow of blood. (C)</p>
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A patient presenting with syncope and a family history of sudden death most likely has which condition?

<p>Arrhythmia-Induced Sudden Cardiac Death (C)</p>
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A patient is diagnosed with Marfan syndrome, which is associated with aortic aneurysms. Which type of aortic aneurysm is most likely to be associated with this condition?

<p>Thoracic (B)</p>
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Flashcards

Leading cause of death in US

Heart disease is the primary cause of death in the US for both men and women across most racial and ethnic groups.

Coronary Heart Disease (CHD)

The buildup of plaque in the heart's arteries, leading to potential heart attacks.

CHD vs. CAD

Terms used interchangeably, but CHD is actually caused by CAD.

Athero-

Gruel-like, soft deposits.

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Sclerosis

Hardening of arteries.

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Modifiable CAD risk factors

Tobacco use, high saturated fat diet, excessive alcohol consumption, and physical inactivity.

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Cholesterol

Essential compound used by the body for cell membrane structure and enzymatic activity; comes from body and diet.

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Total Cholesterol

A measure of LDL, HDL, and other lipid components.

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Fatty Streak

Earliest detectable atherosclerotic lesion; appears as lipid foam cells.

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Myocardial Ischemia

Occurs when myocardial oxygen demand exceeds supply.

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Angina Pectoris

Classic symptom of Ischemia, described as pressure or heaviness.

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Chronic Stable Angina

Angina associated with stable O2 demand.

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Unstable Angina

Angina without the demands which usually generate it.

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Myocardial Infarction (MI)

Complete interruption of blood to an area of the myocardium.

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Response to MI: Cell death

Cells die necrotic tissue referred to as the zone of infarct.

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Subendocardial MI

Injury only extends through part of the heart wall.

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Transmural MI

Injury extends through the whole heart wall.

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Type 1 MI

Acute injury with plaque rupture or erosion, can be both STEMI and NTSMI.

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Type 2 MI

Myocardial ischemia due to oxygen supply-demand imbalance for other reasons.

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Anginal Symptoms

Chest pressure, heaviness, DOE, fatigue, syncope and belching.

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Diagnosis of MI

At least 2/3 of Cardiac Enzymes, Anginal Symptoms, and/or EKG changes

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NYPH stroke protocol

At New York Presbyterian Hospital, we instruct our patients to stay within 20-25 bpm of baseline in the first 6-8 weeks.

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Cardiac Muscle Pump Dysfunction

Cardiac muscle dysfunction that produces small cardiac impairment seen by small decreases in SV, CO, EF.

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Cardiac Muscle Pump Failure

Cardiac muscle fails to contract/relax enough and results in significant decreases in SV, CO, EF.

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Congestive Heart Failure (CHF)

Syndrome where the heart is unable to pump enough output to meet body's needs.

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Systolic Heart Failure

Failure during ventricular contraction time.

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Diastolic Heart Failure

Failure during filling of the ventricles.

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Edema Due to CHF

When edema starts to occur due to CHF

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NYHA Classification

New York Heart Assocation - Classifies heart failure according to severity of symptoms.

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NYHA classification sections

Class I,II,III,IV relating with functional limitation and A,B,C,D relating to the severity of cardiovascular disease.

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Goals of Treatment for CHF

Improve ability to pump, Reduce workload, Control sodium intake, Fluid restriction.

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Non-Drug Management of CHF

CARDIAC REHABILITATION, Education, Diet + Nutrition, etc.

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Medical management of CHF

Decrease venous return & work of heart, Increase work of heart, Diuretics/Aspirin etc.

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Surgical management of CHF

Pacemaker/Stenting, Bypass, IABP/Ventricular Assist, Heart Transplant

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Compensated CHF

Chronic heart failure with controlled symptoms through medication.

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Decompensated CHF

Chronic heart failure that has worsened beyond baseline.

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Cardiomyopathy (CM)

A diverse group of myocardial abnormalities.

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Dilated CM (DCM)

Characterized by enlargement of all 4 heart chambers.

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Hypertrophic CM (HCM)

Characterized by a considerable increase in cardiac mass - risk of sudden death.

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Restrictive CM (RCM)

Characterized by the restriction of ventricular filling.

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Treatment of CM

What treatment option is Lifestyle changes, Medication, Surgery and Nonsurgical Procedures are used.

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Normal Valve Function

Heart valves ensure that blood flows in one direction.

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Valve Stenosis

A valve that is Narrowed or constricted - all valves are involved.

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Valve of regurgitation

Valve where the backflow of blood is occurring - more common on the left side.

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Valve Prolapse

Commonly seen in Mitral Valve can cause clicking sound.

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Treating Valve Disease

Correct or correct valve disease but may regulate heart rhythms and reduce HR.

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Sudden Cardiac Arrest

When an arterial pulse goes without prior circulatory collapse.

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Ventricular Fibrillation

When there is no pulse with chaotic depolarizaiton.

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Aneurysm

Localized dilatation and weakening of the wall of a blood vessel produces blowing murmur.

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Types of Aneursym

Saccular - spherical

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Dissecting of Aneurysm

When blood pools between the vessels layers.

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Infrarenal

Below renal arteries, and may be symptomatic or asymptomatic.

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Thoracic Aneuryms

Due to Artherosclerosis and trauma related accidents.

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Aortic Dissection

What vessels are damaged or torn.

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Endocarditis

Infection of lining that can lead to fatal heart failure.

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Pericardidis

Inflammation due to viral or tumours causing pain.

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Treatment for Pericarditis

Occurs from Positioning due to pain and Aspirin use.

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Cardiac Tumours

Generally very rare a curable with surgery that are sarcomas.

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Study Notes

Cardiac Pathophysiology: The Numbers

  • About 702,880 Americans died from heart disease in 2022; this is approximately 1 in every 5 deaths
  • Coronary heart disease is the most common type of heart disease, killing more than 375,476 people in 2021
  • Approximately 20.1 million adults aged 20 and older have CAD
  • Heart disease is the leading cause of death for both men and women in most racial and ethnic groups in the U.S.
  • Heart disease costs the United States $252.2 billion each year (2019-2020)
  • This total includes the cost of health care services, medications, and lost productivity due to death
  • Heart disease is the leading cause of death for people of most racial/ethnic groups in the United States, including African Americans, America Indian, Alaska Native, Hispanic, and White men
  • For women of Asian or Pacific Islander, American Indian, Alaska Natives, or Hispanic descent, heart disease is second only to cancer

Medicine Admission Note

  • Patient is a 93-year-old male with ischemic cardiomyopathy (ICM) with an ejection fraction (EF) of 30-35%
  • The patient has severe pulmonary hypertension (pHTN), 3+ mitral regurgitation (MR), and presents with dyspnea for one day
  • Recent admission was for congestive heart failure (CHF) exacerbation with discharge (d/c) to a skilled nursing facility (SAR)
  • The patient reports that their daughter sets up their medications
  • The patient often forgets to take their Lasix

Objectives of Cardiac Pathophysiology Study

  • Explain the basics of Coronary Heart Disease and how atherosclerotic plaques are formed
  • Identify the types of angina
  • Explain myocardial infarction, including types and zones of infarction
  • Identify how MI is diagnosed and the basic treatment
  • Explain the difference between cardiac pump dysfunction and failure
  • Explain the differences between right and left heart failure, as well as systolic and diastolic heart failure
  • Identify the consequences of CHF and ventricular remodeling
  • Identify how CHF is diagnosed and basic treatment
  • Effectively describe the types of cardiomyopathy
  • Accurately describe valvular heart disease, sudden cardiac death, aneurysms, endocarditis, pericarditis, and cardiac tumors

Topics in Cardiac Pathophysiology

  • Ischemic Heart Disease, including Atherosclerotic Heart Disease, Coronary Artery Disease, Coronary Heart Disease, Angina, and Myocardial Infarction
  • Cardiac Muscle Dysfunction, including Heart Failure and Cardiomyopathy
  • Valve Disease
  • Sudden Cardiac Death
  • Aneurysms that may cause Vascular Disease
  • Endocarditis
  • Pericarditis
  • Tumors

Coronary Heart Disease (CHD) Overview

  • CHD involves the buildup of plaque in the heart's arteries, which can cause a heart attack
  • CAD is Coronary Artery Disease
  • CHD is Coronary Heart Disease
  • The terms CAD and CHD are often used interchangeably
  • CHD is actually caused by CAD
  • Ischemia
  • Infarction

Atherosclerotic Heart Disease

  • Atherosclerotic Heart Disease is also known as Coronary Artery Disease
  • Athero means gruel or soft deposit
  • Sclerosis means hardening
  • Atherosclerotic Heart Disease is characterized by nodular deposits of fatty material that line the walls of the artery (plaques)
  • Vessel walls may lose their elasticity and become sclerotic; This is known as "Hardening of the Arteries"

CAD Risk Factors

  • Lifestyles are the modifiable risks
  • Tobacco use
  • Diet high in saturated fat, cholesterol, and calories
  • Excess alcohol consumption
  • Physical inactivity
  • Biochemical or Physiologic Characteristics are modifiable risks
  • Blood lipid abnormalities
  • Cholesterol production
  • Elevated blood triglycerides
  • Hyperglycemia / DM
  • Obesity
  • Hypertension
  • Personal Characteristics are non-modifiable risks
  • Gender
  • Age
  • Family history of CAD
  • Personal history of CAD

Cholesterol Fundamentals

  • Cholesterol is an essential compound used by the body for cell membrane structure and enzymatic activity
  • Cholesterol transports fatty acids and lipids
  • The body synthesizes 75% of cholesterol
  • Food sources comprise 25% of cholesterol, found only in animal products

LDL Cholesterol

  • LDL (Low-Density Lipoprotein) is considered "bad" cholesterol
  • A higher LDL number signifies a higher risk
  • Desirable LDL: <100
  • Near optimal LDL: 100-129
  • Borderline high LDL: 130-159
  • High LDL: 160-189
  • Very high LDL: >190
  • An LDL of <70 is recommended for patients with Coronary Heart Disease or vessel disease
  • An LDL of <100 is recommended for those with Diabetes Mellitus or other risk factors

HDL Cholesterol

  • HDL (High-Density Lipoprotein) is considered "good" cholesterol
  • A higher HDL number signifies a lower risk
  • Optimal HDL: >60
  • Low HDL: <40 for men and <50 for women
  • HDL Cholesterol protects against Coronary Heart Disease by removing LDLs from the blood and preventing their buildup in arteries

Triglycerides Overview

  • Triglycerides are part of the lipoprotein profile
  • High triglyceride levels equal high risk
  • Triglycerides are fats carried in the blood from food
  • Normal triglycerides: <150
  • Borderline high triglycerides: 150-199
  • High triglycerides: 200-499
  • Very high triglycerides: >500

Total Cholesterol Insights

  • Total Cholesterol is a measure of LDL, HDL, and other lipid components
  • Desirable: <200
  • Borderline high: 200-239
  • High: >240

LDL:HDL Ratio

  • This ratio provides a composite risk marker
  • A ratio of < or = 3:1 is low risk
  • A ratio of > or = 5:1 indicates increased risk

Total Cholesterol (CHOL):HDL Ratio

  • Useful as a predictor for development of cholesterol related blockages
  • A ratio of >4.5 is increased risk of atherosclerosis

Atherosclerotic Lesions

  • Atherosclerotic Lesions can develop because of abnormal lipid metabolism, excessive intake of cholesterol/saturated fats, and/or genetic predisposition

Pathogenic Mechanism of Plaque Formation Basics

  • The earliest detectable atherosclerotic lesion is the fatty streak (lipid foam cells)
  • Fatty streak becomes fibrous plaque

The Lipid Hypothesis

  • Increased plasma LDL levels penetrate the arterial wall, leading to lipids accumulating in smooth muscle cells and macrophages (foam cells)
  • LDL increases smooth muscle cell hyperplasia and migration of cells into sub-intimal and intimal regions
  • As the fatty streak and fibrous cap enlarge, they tear the endothelium, where platelets aggregate causing thrombus formation

Chronic Endothelial Injury

  • Injury to the interior of the cell wall by macrophages causes platelets, monocytes, lipids, and smooth muscle cells to migrate from the media to the intima
  • Cells aggregate where they form a fibrous cap
  • Platelets form clots and release proteins with tough fibers, hardening the artery
  • This can block blood flow or break off and throw a clot

Review of Cardiac Blood Supply

  • Coronary Arteries arise from, terminate in vessel that supply the heart
  • Left Coronary Artery supplies blood to most of left parts and septum of the heart
  • Right Coronary Artery supplies blood to the posterior septum and inferior parts of the heart

Understanding Myocardial Ischemia

  • Myocardial Ischemia occurs when myocardial oxygen demand is greater than the supply
  • Myocardial Ischemia is reversible
  • Myocardial Ischemia can be caused by increased oxygen demand from exercise or stress
  • Myocardial Ischemia can be caused by decreased oxygen supply due to decreased coronary blood flow
  • Myocardial Ischemia is diagnosed by exercise stress test, arrhythmias and T wave inversion on an EKG that later becomes ST elevation

Angina Pectoris (Angina) Overview

  • Is described as pressure or heaviness in the substernal (midchest) area, over the heart (precordial), or in the shoulder, arm, throat or jaw
  • Types of angina are Chronic and Unstable

Chronic Stable Angina

  • Is generally associated with a set level of O2 demand and usually lasts several minutes
  • Chronic Stable Angina is precipitated by exertion, emotional stress, or heavy meals
  • Symptoms include pressure and heaviness
  • Relief with nitroglycerin (NTG)

Unstable Angina

  • Involves angina symptoms without the demands to generate it
  • Displays change in typical pattern or symptoms at rest (without O2 demand)
  • Evidenced by complex coronary stenosis plaque rupture/ulceration, and Hemorrhage and thrombus formation
  • An unstable situation may progress to complete occlusion and infarction

Prinzmetal's Angina

  • Occurs almost exclusively at rest due to coronary artery spasm
  • Often responds to NTG but not always
  • Often severe, awakening patient from sleep
  • Usually involves the RCA
  • Associated with arrhythmias and conduction defects as well as acute MI
  • Silent Ischemia is asymptomatic

Myocardial Infarction (MI) Explained

  • Is a COMPLETE interruption of blood supply to an area of the myocardium
  • Is caused by sudden arterial or venous insufficiency that produces an area of necrosis
  • Develops from ischemia

Causes of Myocardial Infarction

  • Prolonged myocardial ischemia, usually due to plaque rupture/thrombus formation
  • Prolonged vasospasm, inadequate myocardial blood flow or excessive metabolic demand
  • Embolic occlusion, aortitis, vasculitis or coronary artery dissection
  • Cocaine and other stimulants may cause severe vasoconstriction resulting in MI
  • Leads to focal death of myocardial tissue in the area supplied by the involved coronary artery, in the left ventricle

Response to Myocardial Infarction

  • Cells die, and necrotic tissue is referred to as the zone of infarct
  • Between 18 – 24 hours post MI is an inflammatory response to necrosis
  • Visible necrosis is present, and myocardial recovery begins in 2-4 days after MI
  • From 4 – 10 days after MI, debris is cleared, and matrix is laid down
  • Between 10 and 14 days after MI, there is formation of a weak fibrotic scar and Revascularization is present
  • Scar tissue is inelastic and cannot contract and relax like healthy myocardial tissue

Zones Affected by an Infarction

  • Zone of Infarct
  • Zone of Injury
  • Zone of Ischemia

MI Classification with EKG

  • Subendocardial MI is partial thickness and defined by non-ST segment elevation (NSTEMI)
  • NSTEMI stems from an acute injury to the myocardium that does not extend through the full thickness of the wall with ST-segment depression on EKG
  • Transmural MI is full thickness and defined by elevated ST segment (STEMI)
  • STEMI stems from full thickness extending through the entire wall muscle with ST-segment elevation, significant Q wave indicates acute infarction
  • Note: ST returns to baseline in 24-48 hours with a STEMI

Newer Classification of Myocardial Infarctions

  • Type 1 MI stems from acute coronary atherothrombotic myocardial injury with plaque rupture or erosion. It can be STEMI or NSTEMI
  • Type 2 MI occurs when Evidence of myocardial ischemia caused by oxygen supply-demand imbalance for other reasons than atherothrombotic injury

MI Location Depends On

  • Anatomic distribution of occluded vessel
  • More proximal a lesion – greater area of infarction
  • Presence of additional stenotic lesions
  • Collateral circulation
  • Anterior Wall MI involves the Left Anterior Descending artery (LAD)
  • Lateral wall MI involves the Left Circumflex artery (LCX)
  • Inferior wall MI involves the Right Coronary Artery (RCA)

Myocardial Infarction Diagnosis Criteria (2/3 Must Occur)

  • Anginal Symptoms such as chest pressure, heaviness, pain in the arm or jaw, DOE, fatigue, syncope, and belching
  • EKG Changes such as peaked T waves and ST elevation
  • Rise of Cardiac Enzymes such as troponin

Variations in Women's Myocardial Infarctions

  • Women are slightly more likely than men to report unusual symptoms for MIs
  • 78% of women in a multi-center study of 515 women reported at least one symptom for more than one month before their heart attack
  • Frequently reported symptoms were unusual fatigue, sleep disturbances, shortness of breath, indigestion and anxiety

Silent Myocardial Infarction

  • Involves no symptoms of angina
  • Can occur in any patient but more common in those with Diabetes Mellitus and/or chronic alcohol abuse
  • May be related to the presence of peripheral neuropathies
  • Ruled in by EKG changes and Cardiac Enzymes

MI Diagnosis & EKG Changes

  • EKG Changes are almost always present
  • Peaked T Waves
  • ST Elevation
  • Q Wave Present
  • T Wave Inversion

Troponin Use in MI

  • Troponin is the preferred marker for myocardial infarctions as of 2004
  • It is highly cardiac specific and is released into the blood
  • Troponin I and Troponin T are types of troponins, specifically the high sensitivity troponins
  • Troponin is elevated between 4-6 hours post MI, remain elevated for several days, and peaks at 24 hours after MI

Role of CK-MB and Myoglobin in MI

  • Creatine Kinase is released when cells die
  • Elevated CK-MB band is specific for myocardial cell necrosis
  • Creatine Kinase is elevated 4 – 8 hours post MI, returns to normal in 2- 3 days, peak elevations occur during the first 24 hours, and produces many false results
  • Myoglobin is a protein released with injury to the myocardium
  • Elevated in 1-4 hours
  • Useful in patients that get to ER quickly

Diagnosis of Acute MI: Additional Tests

  • CXR that is not very specific for myocardial infarctions
  • TEE (Transesophageal Echocardiogram)
  • Coronary Angiography (Angiogram)
  • Cardiac Catheterization that can rule in for myocardial infarctions if uncertain and/or used as a treatment option

Medical Treatment of MIs

  • Utilize Pharmacological Agents that reduce myocardial oxygen demand, increase myocardial oxygen supply, or improve myocardial muscle function
  • Decrease myocardial oxygen demand with Beta Blockers and Calcium Channel Blockers
  • Increase myocardial oxygen supply with Vasodilators (Nitroglycerin)
  • Improve myocardial muscle function with Digitalis Glycosides

Surgical Treatment of MIs

  • Thrombolysis is an option
  • Intra-aorta Balloon Pump (IABP) can be used
  • Percutaneous Transluminal Coronary Angioplasty/Percutaneous Coronary Intervention (PTCA/PCI) with or without Stent Placement can be leveraged
  • Coronary Artery Bypass Graft (CABG) is another option
  • Left Ventricular Assist Device (LVAD) can be used
  • Cardiac Transplantation is the most extreme option

Post-MI Protocol

  • Patients should stay within 20-25 bpm of baseline (resting heart rate) in the first 6-8 weeks post MI
  • Perform light warm-up exercises in sitting
  • Undertake a walking program

Cardiac Muscle Pump Dysfunction vs Failure Explained

  • Cardiac Muscle Pump Dysfunction causes small cardiac impairment and leads to small decreases in SV, CO, EF with less marked functional effects
  • Cardiac Muscle Pump Failure causes a failure of muscle to contract and results in significant decreases in SV, CO, EF
  • Both will increase pressures in the Heart Chambers, Pulmonary artery, and throughout the peripheral & pulmonary vasculature

Cardiac Muscle Dysfunction Overview

  • Impairs the heart's ability to pump or accept blood
  • May cause Congestive Heart Failure or Cardiomyopathy

Congestive Heart Failure (CHF) Basics

  • CHF is a syndrome where the heart is unable to pump enough output to meet the body's metabolic demands
  • It may result from structural or functional cardiac disorder that impairs the filling or pumping ability of the ventricles
  • CHF is affected by: CAD, HTN, DM, Valvular and congenital heart disease, Arrhythmias, or ETOH/drug abuse

Characteristics of Congestive Heart Failure

  • Dyspnea
  • Tachypnea
  • Paroxysmal Nocturnal Dyspnea
  • Orthopnea
  • Fatigue
  • Peripheral edema
  • Cyanosis
  • Weight gain
  • Hepatomegaly
  • Jugular Vein Distension
  • Rales/crackles (especially wet)
  • S3 heart sound
  • Sinus tachycardia
  • Poor exercise tolerance

CHF Classification

  • Systolic versus Diastolic Heart Failure
  • Left Sided versus Right Sided Ventricular Failure
  • Heart Failure with Reduced Ejection Fraction (HFrEF) versus Heart Failure with Preserved Ejection Fraction (HFpEF)

Systolic Heart Function

  • Is measured by the time for ventricular contraction
  • Relies on Preload, Afterload, Contractility of the myocardium, and Rate of contraction

Diastolic Heart Function

  • Is measured by the time for filling of the ventricles
  • Relies on the Frank-Starling mechanism, namely Left ventricular end-diastolic pressure (LVEDP) and amount of muscle fiber stretch at end of diastole, as it impacts the strength of the ventricular contraction

Systolic Heart Failure

  • Decreased CONTRACTILITY leads to pump failure
  • Is the most common problem with heart failure
  • Leads to increased PRELOAD, resulting in pump failure
  • Leads to increased PRELOAD, resulting in pump failure
  • Affects CHRONOTROPY, resulting in a heart rate that is too slow or too rapid and leads to pump failure

Diastolic Heart Failure

  • Is caused by impaired Diastole dueto excessive hypertrophy of ventricles and changes in composition of myocardium
  • Reduced End Diastolic Volume(EDV) may be caused by decreased filling of the left ventricle from increased stiffness
  • Can have an increase in ventricular pressure because of decreased compliance of the left ventricle
  • Overall see elevated diastolic pressures that may cause decreased cardiac output

Edema and CHF

  • Edema may be caused by increased EDV which leads to increased pulmonary capillary pressure, which will lead to transudation of fluid
  • Pulmonary edema develops with Pressure in pulmonary vasculature at 25 mmHg

Left-Sided Ventricular Failure Characteristics

  • Left ventricle is not working efficiently, leading to Decreased SV and CO, Increased LVEDV, Decreased LV compliance, Increased left atrial dilatation, Increased pressure in pulmonary vessels and Transudation of fluid from pulmonary capillaries
  • Increased LVEDP can occur
  • Mitral valve regurgitation can occur if LV dilatation may stretch mitral valve annulus.
  • Caused by myocardial diseases, cardiomyopathy, hypertension, dysrhythmia/arrhythmia, or medication toxicity

Right Sided Ventricular Failure Characteristics

  • Right ventricle not working effectively: Prolonged pulm HTN, Increased right ventricle afterload, and Anatomical changes to right ventricle
  • Right ventricular end-diastolic pressure (EDP) increases and Reflects back up to right atrium and venous system May can be caused by Jugular vein distension (JVD), liver engorgement, ascites, and peripheral edema or pulmonary vasoconstriction
  • It can result from Pulmonary HTN, Mitral Valve regurgitation, Chronic/acute pulmonary dz (ex: PE, COPD), Left HF, Cardiomyopathy

Heart Failure with Reduced Ejection Fraction

  • Heart failure with reduced ejection fraction (HFrEF) is most frequently associated with heart failure and is caused by low CO at rest/with exertion

Heart Failure with Preserved Ejection Fraction

  • Heart failure with preserved ejection fraction (HFpEF) often indicates a volume overload
  • Total cardiac output is lower than "normal" but is considered "preserved"

Cardiac Ventricular Remodeling

  • Refers to changes in size, shape, structure and physiology of the heart after injury to the myocardium from MI or chronic HTN
  • Includes Physiologic or Pathologic changes
  • Occurs structurally and functionally in the zones of infarction, injury, ischemia
  • Begins minutes post MI and continues over time
  • The Left ventricle may change from elliptical to spherical
  • Apoptosis, or programmed death of cells, may occur

Ventricular Remodeling

  • This is an Increase ventricular (usually left) size
  • The Heart becomes more spherical
  • Functional mitral regurgitation occurs
  • Systolic performance worsens

Physiologic Consequences of Chronic Heart Failure

  • Decreased myocardial performance. There will be an increased venous return and a contraction of vasculature due to increased peripheral vascular resistance.
  • The sympathetic stimulation also desensitizes the heart to β1-adrenergic receptor stimulation and increases heart’s force.
  • Pulmonary edema can occur in severe cases due to increased filling pressures
  • CO decreases renal blood flow, which causes a change to the glomerular filtration rate. This causes the sodium and retaining of fluids in the kidney. Heart failure is associated to circulating levels of arginine vasopressin with the vasoconstrictor function and inhibitor of water in extraction.

Consequences of Heart Failure

  • Muscle wasting & possible muscles skeletal disorders and osteoporosis are possible as a result to activities and co-morbidities. Due to the vascular and impared ability to lead to sedentary results with Inability to increase HR. Diastolic causes exercise intolerant with low ejection fracture.
  • Anemia and abnormal red white blood cells and hemostatic.
  • Cardiac cirrhosis happens due to hepatic results such as: hypoperfusion to decreased in the venous congestions. With also increasing the factor to myocardial as pressant.
  • See anorexia that result to malnutrition

Summary of Body's Compensation Mechanisms for CHG

  • Sympathetic NS (SNS)
  • Renin-angiotensin-aldosterone system (RAAS)
  • Natiuretic peptide counter-regulatory system

The SNS Compensation for Congestive Heart Failure

  • Compensation starts with decreased Cardiac Output sensed by the baroreceptors
  • The body's sympathetic nervous system increases to improve Cardiac Output. This results to increase systemic with the vasoconstrictor stimulate the releasing of renal function in the kidneys.
  • Leads to increased Release of norepinephrine with increases HR and SV myocardial to help improved cardiac output.

The RAAS Compensation for Congestive Heart Failure

  • Compensation starts to help cardiac and balance pressure to the setting of what cause that to being depletion. Increases with venous and atrial contractions. Increasing the retaining on salts and water to help triggered norepinephrine to be balanced.
  • With the Angiotensin factor will help powerful blood that can effect the functions with the reduced renal perfusion or lead to causes that will promote aldosterone. Which can results in the releasing of red blood cells, the process that can help kidneys with actions of kidneys.
  • Maintaings BP and CO with balances

Hormones Involved in Congestive Heart Failure

  • Norepinephrine
  • Renin
  • Angiotensinogen
  • Aldosterone
  • All contribute to further the disease process, and their concentration correlates with severity and prognosis

Counter-regulatory Hormones in Congestive Heart Failure

  • Natriuretic peptides (NP): ANP, atrial NP (atria). C type NP (endothelial)—contributes to vasodilation
  • Release of ANP, BNP stimulates the ventricles and high fillings in pressure. Have systemic that relates to kidneys with water diuretics. Also, relax the lusitropic with myocardium functions.
  • Can help reflect the amount of water through the acute and chronic overload.

Clinical Manifestations of Congestive Heart Failure

  • Progressive Dyspnea that exertion results from pulmonary edema, pallor, cyanosis, diaphoresis, tachypnea, anxiety, agitation, and cerebral hypoxia
  • Dependent edema, hepatomegaly, ascites and fatigue
  • Anorexia, rales and bloating can be caused by right sided of the heart such as weight gains and pain with the level of the amount of urinating.

Diagnosis of Congestive Heart Failure

  • Use an Echocardiogram, Blood test with high/low counts to see if the threshold is to affect that level
  • Use Hematology/Lab, Electrolytes,Renin , and Liver test to to test levels

Radiologic Findings in Imaging

  • Find if Cardiac area can show an Interstitial region around to alveolars or Perivascular
  • Show more fluids and atelectasis on the lungs.

NYHA: Classification of Congestive Heart Failure

  • The classification for it the way that can depend on functions by placing the patients to see if their on to be limit or to be physical for certain activity. It also depend on how much objective they are into to see how much function
  • Uses functional classification to place patients in one of four categories in terms of limits placed during physical activity
  • Uses objective assessment

NYHA Disease

  • Is when the cardiac muscle isn’t to allow to carry any activities without being discomfort. For I-no is when the limit in physical. And II as slight then III as markets

Treatment is directed at the underlying cause in Congestive Heart Failure

  • Goals of treatment include ability to pump, work to reduce the extra load, and balancing the intake of sodium and water tension
  • This can be done with medical and non-medical ways

Non-Medication Management of CHF

  • Education on how to maintain a cardio to rehabilitate any other complications that is related. Such, Symptoms education. Maintaining with good exercise with less salt in it. Check the scale and weight.

Medication Management of Congestive Heart Failure

  • The goals are the work load.
  • Work and maintain with diuretics, beta blocker, ACE antiol, inotopes
  • Also use check dialysis

Surgical Management of Congestive Heart Failure

  • Includes Cardiac resynchronization therapy with athrectomy
  • Angioplasty with rotational of removing the stenting material to create the bypass
  • Laser treatments can be use to help promote the heart.
  • Use mechanical device such as balloon , a-v,and a implant

Compensated vs Decompensated Congestive Heart Failure

  • Chronic HF patients are generally on a cocktail of medications
  • Displays mild to moderate symptoms with degree of volume overload
  • Decompensation may occur, resulting in worsening of baseline abnormalities

Causes of Cardiomyopathy (CM)

  • Cause a variety of issues associated myocardial that cause effect to contracts or muscles around the the chambers of CM
  • Includes dilated, hypertrophic or restrictive.

Dilated Cardiomyopathy (DCM)

  • Can be caused by large amount mass and Dilation with all the 4 chambers. With little of thichening then has systolic from no working properly when that is damage to the to work with the heart.
  • Can lead for issues when breathing it gets and lead for more symptoms of heart failure by causing dyspnea and fatigue. As with this that that can occur to cause more symptomatic to ventricles with increase oxygen
  • As with is, the reasons is for many as the heart to disease. Can lead to infections. Also other things with chemicals by toxin then there the hereditaries factor on it.

Results and Risk for Dilated Cardiomyopathy

-Decreases the process to working properly -Can damage your ability with exercising properly -Can damage left and right Ventricle -Can leads to clinical to heart and failure.

Hypertrophic Cardiomyopathy (HCM)

  • Is caused by hypertrophic and masses for the heart. With an limited on cavity
  • There are two classifications and May lead with a rapid ventricular.
  • Is found through routine for patient that have S that may have a heart problem

Restrictive Cardiomyopathy (RCM)

  • Is very rare because of infection the in the ventricular and endocardial and also the myocardial issue.
  • As result you can have fluid, cause the heart to enlarge and heart failure with increase in the ventricular problems.

Treatment for Cardiopulmonary

  • The goal to cause is to help manage what ever conditions were a side cause. Help control any warning to be for heart or any sudden infection. and reduce by complication

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