Module 7 CV Dysfunction Valve Disorders Part 4

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which of the following best describes the impact of mitral valve stenosis on blood flow dynamics?

  • It results in a higher stroke volume due to increased preload in the left ventricle.
  • It leads to increased blood flow velocity through the mitral valve during diastole to maintain cardiac output.
  • It causes a decrease in the pressure gradient between the left atrium and left ventricle during diastole.
  • It obstructs blood flow from the left atrium to the left ventricle, increasing left atrial pressure. (correct)

In a patient with mitral regurgitation, what compensatory mechanism would you expect to observe in the left ventricle over time, and what is its primary consequence?

  • Increased afterload leading to reduced stroke volume.
  • Increased contractility leading to a decrease in ejection fraction.
  • Eccentric hypertrophy leading to increased left ventricular end-diastolic volume. (correct)
  • Concentric hypertrophy leading to decreased myocardial wall stress.

A patient presents with a high-pitched, blowing systolic murmur that is best heard at the apex, radiating to the axilla. Which valvular abnormality is most likely causing this murmur?

  • Mitral regurgitation. (correct)
  • Tricuspid regurgitation.
  • Mitral stenosis.
  • Aortic stenosis.

What is the primary hemodynamic consequence of aortic stenosis on the left ventricle?

<p>Pressure overload due to increased resistance to ejection. (A)</p> Signup and view all the answers

Which statement accurately describes the relationship between valvular disorders and myocardial oxygen demand?

<p>Valve regurgitation increases myocardial oxygen demand due to the increased volume of blood being pumped. (C)</p> Signup and view all the answers

In the context of aortic regurgitation, what is the significance of a widened pulse pressure, and how does it relate to the pathophysiology of the disorder?

<p>It represents increased systolic pressure and decreased diastolic pressure due to the backflow of blood into the left ventricle. (A)</p> Signup and view all the answers

A patient with known mitral valve prolapse presents with new-onset atrial fibrillation. What is the most likely underlying mechanism connecting these two conditions?

<p>Chronic inflammation and fibrosis of the atrial tissue due to mitral valve leaflet abnormalities. (B)</p> Signup and view all the answers

How does the Frank-Starling mechanism contribute to maintaining cardiac output in the early stages of mitral regurgitation, and what are the limitations of this compensation?

<p>It increases preload to enhance contractility, but excessive preload can lead to pulmonary congestion. (A)</p> Signup and view all the answers

A patient with aortic stenosis develops angina pectoris despite having no significant coronary artery disease. What is the most likely explanation for this phenomenon?

<p>Increased myocardial oxygen demand due to left ventricular hypertrophy and increased wall stress. (D)</p> Signup and view all the answers

What is the relationship between atrial fibrillation and mitral stenosis, and how does atrial fibrillation impact the management of mitral stenosis?

<p>Atrial fibrillation can lead to loss of atrial kick, decreased cardiac output, and increased risk of thromboembolism in mitral stenosis. (B)</p> Signup and view all the answers

What is the significance of identifying the location where a murmur is best auscultated on the chest wall, and how does it correlate with specific valvular abnormalities?

<p>The location of maximal intensity corresponds anatomically to the valve responsible for the murmur. (B)</p> Signup and view all the answers

A patient with chronic aortic regurgitation remains asymptomatic for many years. What compensatory mechanism allows for this prolonged asymptomatic period, and what is the eventual consequence of this compensation?

<p>Left ventricular dilation and hypertrophy maintain stroke volume, eventually leading to heart failure. (B)</p> Signup and view all the answers

How does mitral stenosis affect pulmonary capillary wedge pressure (PCWP), and what is the underlying mechanism for this change?

<p>It increases PCWP due to elevated left atrial pressure and pulmonary venous congestion. (B)</p> Signup and view all the answers

A patient with severe aortic regurgitation develops a bounding pulse and a positive Corrigan's sign (visible carotid pulsations). What is the pathophysiological basis for these findings?

<p>Rapid ejection of a large stroke volume into the aorta and subsequent rapid diastolic runoff. (A)</p> Signup and view all the answers

In the management of mitral regurgitation, what is the rationale for using afterload-reducing agents such as ACE inhibitors or ARBs?

<p>To decrease the systemic vascular resistance, facilitating forward flow and reducing the regurgitant fraction. (C)</p> Signup and view all the answers

How does the development of left ventricular hypertrophy (LVH) in aortic stenosis affect the risk of sudden cardiac death, and what is the underlying mechanism?

<p>LVH increases the risk of sudden cardiac death due to increased myocardial fibrosis and electrical instability. (B)</p> Signup and view all the answers

A patient with mitral stenosis is being evaluated for percutaneous balloon valvuloplasty. What is the primary goal of this procedure, and what factors would make a patient a suitable candidate?

<p>To increase mitral valve area, reduce left atrial pressure, and improve cardiac output; suitable candidates have pliable valve leaflets, minimal calcification, and no mitral regurgitation. (A)</p> Signup and view all the answers

What is the physiological rationale for recommending sodium restriction in patients with valvular heart disease, particularly in those with regurgitant lesions?

<p>Sodium restriction decreases fluid retention, reduces blood volume, and alleviates pulmonary congestion. (A)</p> Signup and view all the answers

How does aortic regurgitation affect left ventricular end-diastolic pressure (LVEDP), and what are the implications of this change on myocardial perfusion?

<p>It increases LVEDP, which can compromise subendocardial perfusion and increase the risk of ischemia. (B)</p> Signup and view all the answers

A patient with known aortic stenosis presents with syncope during exertion. What is the most likely mechanism linking aortic stenosis to exertional syncope?

<p>Inadequate increase in cardiac output to meet the demands of exercise due to fixed obstruction and potential for arrhythmias. (A)</p> Signup and view all the answers

In the context of valvular heart disease, what is the significance of brain natriuretic peptide (BNP) levels, and how do they guide clinical decision-making?

<p>Elevated BNP levels suggest increased cardiac wall stress and heart failure, guiding the need for more aggressive medical or surgical intervention. (A)</p> Signup and view all the answers

A patient with mitral regurgitation is scheduled for valve repair surgery. What are the advantages of mitral valve repair over mitral valve replacement, and which patients are most suitable for repair?

<p>Valve repair preserves left ventricular function, avoids lifelong anticoagulation, and is suitable for patients with pliable leaflets and minimal structural damage. (D)</p> Signup and view all the answers

A patient with long-standing aortic stenosis develops left ventricular dilation and reduced ejection fraction. What is the significance of this transition, and how does it impact prognosis?

<p>These changes signify a transition to irreversible myocardial damage and a worse prognosis. (C)</p> Signup and view all the answers

What is the role of endocarditis prophylaxis in patients with valvular heart disease, and which patients are considered high-risk and require antibiotic prophylaxis before certain procedures?

<p>Antibiotic prophylaxis is reserved for high-risk patients with prosthetic valves or a history of endocarditis undergoing procedures with a high risk of bacteremia. (D)</p> Signup and view all the answers

A patient with suspected aortic stenosis undergoes echocardiography. What specific echocardiographic parameters are most critical in determining the severity of aortic stenosis?

<p>Peak aortic jet velocity, mean pressure gradient across the aortic valve, and aortic valve area. (C)</p> Signup and view all the answers

How does the timing of surgical intervention impact the outcomes in patients with severe asymptomatic aortic stenosis?

<p>Early surgical intervention can prevent irreversible myocardial damage and improve long-term survival compared to waiting for symptoms to develop. (D)</p> Signup and view all the answers

In the management of patients with mitral valve stenosis, what is the role of diuretics, and what are the potential risks associated with their use?

<p>Diuretics reduce preload and alleviate pulmonary congestion, but they can cause excessive volume depletion and hypotension. (B)</p> Signup and view all the answers

A patient with severe mitral regurgitation is being considered for chordal replacement during mitral valve repair. What is the primary goal of chordal replacement, and how does it improve valve function?

<p>To improve leaflet coaptation, restore valve geometry, and prevent recurrent regurgitation. (D)</p> Signup and view all the answers

What is the primary advantage of using transcatheter aortic valve replacement (TAVR) over surgical aortic valve replacement (SAVR) in selected patients with aortic stenosis?

<p>TAVR is less invasive, results in faster recovery, and is suitable for patients at high surgical risk. (D)</p> Signup and view all the answers

A patient with valvular heart disease is being evaluated for potential cardiac resynchronization therapy (CRT). What specific criteria would make them a suitable candidate for CRT, and how does CRT improve cardiac function?

<p>Wide QRS complex, left ventricular ejection fraction &lt; 35%, and presence of heart failure symptoms despite optimal medical therapy; CRT improves ventricular synchrony and cardiac output. (A)</p> Signup and view all the answers

In the context of aortic stenosis, what is the significance of the aortic valve calcification score on computed tomography (CT), and how does it influence treatment decisions?

<p>A higher aortic valve calcification score correlates with increased severity of aortic stenosis and may influence the choice between TAVR and SAVR. (D)</p> Signup and view all the answers

A patient with mitral valve prolapse presents with symptomatic palpitations and anxiety despite being on beta-blockers. What alternative or adjunctive therapies might be considered, and what is the rationale for their use?

<p>Selective serotonin reuptake inhibitors (SSRIs) or cognitive-behavioral therapy (CBT) to manage anxiety and improve autonomic nervous system regulation. (B)</p> Signup and view all the answers

In caring for a patient with aortic regurgitation, how does the understanding of ventricular-arterial coupling influence treatment strategies, and what interventions are used to optimize this coupling?

<p>Understanding ventricular-arterial coupling guides the use of vasodilators to reduce afterload, improve forward flow, and optimize ventricular function. (C)</p> Signup and view all the answers

What is the significance of evaluating right ventricular function in patients with left-sided valvular heart disease, and how does right ventricular dysfunction impact outcomes?

<p>Right ventricular dysfunction is a late manifestation of severe left-sided valvular heart disease and is associated with increased mortality and morbidity. (A)</p> Signup and view all the answers

A patient with severe mitral stenosis and pulmonary hypertension is being evaluated for lung transplantation. What is the rationale for considering lung transplantation in this context, and what are the contraindications?

<p>Lung transplantation is considered only if pulmonary hypertension is irreversible despite mitral valve intervention; contraindications include severe left ventricular dysfunction and systemic disease. (D)</p> Signup and view all the answers

In managing patients with valvular heart disease and atrial fibrillation, what factors influence the choice between rate control and rhythm control strategies, and what are the potential benefits and risks of each approach?

<p>The choice depends on the severity of symptoms, left atrial size, and patient preferences; rate control reduces symptoms but increases thromboembolic risk, while rhythm control maintains atrial synchrony but carries risks of antiarrhythmic drugs. (D)</p> Signup and view all the answers

Flashcards

Stenosis

Valve is narrowed or stiff, requiring more pressure to push blood through it.

Regurgitation

Valve does not close completely, causing blood to flow backwards.

Mitral Stenosis

Mitral valve narrowing, obstructing blood flow from the left atrium to the left ventricle.

Mitral Regurgitation

Backward flow of blood from the left ventricle into the left atrium during systole.

Signup and view all the flashcards

Causes of Chronic Mitral Regurgitation

Rheumatic fever, infective endocarditis, dysfunction of papillary muscle, aging valve tissue.

Signup and view all the flashcards

Cause of Acute Mitral Regurgitation

Papillary muscle rupture secondary to acute MI, requiring medical emergency intervention.

Signup and view all the flashcards

Chronic Mitral Regurgitation

LV dilation and hypertrophy and LA dilation and hypertrophy.

Signup and view all the flashcards

Aortic Stenosis

Aortic valve narrowing, obstructing blood flow from the left ventricle to the aorta.

Signup and view all the flashcards

Aortic Regurgitation

Backward flow of blood from the aorta into the left ventricle during diastole.

Signup and view all the flashcards

Tricuspid Stenosis

Tricuspid valve narrowing, obstructing blood flow from the right atrium to the right ventricle.

Signup and view all the flashcards

Tricuspid Regurgitation

Backward flow of blood from the right ventricle into the right atrium.

Signup and view all the flashcards

Aortic valve auscultation location

Second right interspace

Signup and view all the flashcards

Pulmonic valve auscultation location

Second left interspace

Signup and view all the flashcards

Mitral valve auscultation location

Fifth left interspace (mitral apical)

Signup and view all the flashcards

Things to know about murmurs

To understand where to listen with a stethoscope, symptoms and medical management

Signup and view all the flashcards

Study Notes

  • Cardiac valve disorders include stenosis and regurgitation

Stenosis

  • Valve becomes narrowed or stiff
  • Requires more pressure to facilitate blood flow through it

Regurgitation

  • Valve does not close completely
  • Results in backward blood flow

Mitral Valve Regurgitation

  • Backward blood flow diminishes blood supply to the periphery and backs up into the pulmonary circuit

Mitral Regurgitation Causes

  • Rheumatic fever due to Beta-hemolytic streptococcus
  • Infective endocarditis
  • Papillary muscle dysfunction
  • Aging valve tissue

Mitral Regurgitation - Chronic

  • Left ventricular dilation and hypertrophy can occur
  • Left atrial dilation and hypertrophy can also occur

Mitral Regurgitation - Clinical Manifestations

  • Weakness and fatigue
  • Exertional dyspnea
  • Palpitations
  • Left ventricular failure
  • Atrial fibrillation

Mitral Regurgitation - Acute:

  • Papillary muscle rupture (secondary to acute MI)
  • Medical emergency

Stethoscope Placement

  • Important considerations when auscultating for murmurs are:
  • Where to listen for a specific murmur
  • Where is the optimal stethoscope placement for hearing a specific murmur
  • Recognizing the signs and symptoms of valvular dysfunction
  • Understanding pertinent medical and nursing management

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

Related Documents

More Like This

Mitral Regurgitation Management Quiz
18 questions
Understanding Mitral Regurgitation
18 questions
Causes of Mitral Regurgitation
10 questions
Use Quizgecko on...
Browser
Browser