Podcast
Questions and Answers
Which of the following scenarios would most significantly disrupt the coordinated sequence of the cardiac cycle?
Which of the following scenarios would most significantly disrupt the coordinated sequence of the cardiac cycle?
- A mild increase in systemic blood pressure due to temporary stress.
- A localized blockage in a small coronary artery causing minor myocardial ischemia.
- Damage to the atrioventricular node affecting the transmission of electrical signals. (correct)
- A slight decrease in blood volume due to dehydration.
If the duration of ventricular systole were significantly prolonged, what compensatory mechanism would the body likely employ to maintain cardiac output?
If the duration of ventricular systole were significantly prolonged, what compensatory mechanism would the body likely employ to maintain cardiac output?
- Decrease the heart rate to reduce myocardial oxygen demand.
- Increase the force of atrial contraction to augment ventricular preload.
- Decrease systemic vascular resistance to facilitate ventricular ejection.
- Increase the duration of diastole to allow for greater ventricular filling. (correct)
A patient presents with a markedly shortened PR interval on an ECG. Which alteration in the cardiac cycle is most likely responsible for this finding?
A patient presents with a markedly shortened PR interval on an ECG. Which alteration in the cardiac cycle is most likely responsible for this finding?
- Prolonged ventricular repolarization.
- Increased refractory period in the ventricles.
- Delayed atrial depolarization.
- Accelerated conduction through the AV node. (correct)
A patient's echocardiogram reveals severely impaired diastolic relaxation. How would this most directly affect the subsequent cardiac cycle?
A patient's echocardiogram reveals severely impaired diastolic relaxation. How would this most directly affect the subsequent cardiac cycle?
In a scenario where atrial contraction is completely absent, what percentage decrease in ventricular filling would likely occur in a healthy individual at rest?
In a scenario where atrial contraction is completely absent, what percentage decrease in ventricular filling would likely occur in a healthy individual at rest?
If the mitral valve were to suddenly become stenotic (narrowed), which phase of the cardiac cycle would be most immediately affected?
If the mitral valve were to suddenly become stenotic (narrowed), which phase of the cardiac cycle would be most immediately affected?
Which of the following interventions would have the most direct impact on increasing the rate of ventricular pressure development during isovolumetric contraction?
Which of the following interventions would have the most direct impact on increasing the rate of ventricular pressure development during isovolumetric contraction?
How would a significant increase in afterload most directly affect the duration of the isovolumetric contraction phase?
How would a significant increase in afterload most directly affect the duration of the isovolumetric contraction phase?
Which of the following best describes the relationship between end-diastolic volume (EDV) and stroke volume (SV) as defined by the Frank-Starling mechanism?
Which of the following best describes the relationship between end-diastolic volume (EDV) and stroke volume (SV) as defined by the Frank-Starling mechanism?
A patient with severe aortic regurgitation will likely exhibit which of the following changes in their cardiac cycle hemodynamics?
A patient with severe aortic regurgitation will likely exhibit which of the following changes in their cardiac cycle hemodynamics?
During exercise, which adaptation contributes most significantly to the increase in cardiac output?
During exercise, which adaptation contributes most significantly to the increase in cardiac output?
Which of the following scenarios would result in the greatest increase in myocardial oxygen consumption?
Which of the following scenarios would result in the greatest increase in myocardial oxygen consumption?
What effect would a significant increase in blood viscosity have on the cardiac cycle?
What effect would a significant increase in blood viscosity have on the cardiac cycle?
A patient is diagnosed with constrictive pericarditis, which impairs ventricular filling. Which of the following compensatory mechanisms is least likely to occur?
A patient is diagnosed with constrictive pericarditis, which impairs ventricular filling. Which of the following compensatory mechanisms is least likely to occur?
What is the primary mechanism by which the Bainbridge reflex affects the cardiac cycle?
What is the primary mechanism by which the Bainbridge reflex affects the cardiac cycle?
In the context of the cardiac cycle, what is the significance of the dicrotic notch?
In the context of the cardiac cycle, what is the significance of the dicrotic notch?
A patient with a significantly prolonged QRS complex on an ECG might experience which of the following alterations in their cardiac cycle?
A patient with a significantly prolonged QRS complex on an ECG might experience which of the following alterations in their cardiac cycle?
How does the administration of a drug that selectively blocks the $I_{f}$ channels in the sinoatrial (SA) node affect the cardiac cycle?
How does the administration of a drug that selectively blocks the $I_{f}$ channels in the sinoatrial (SA) node affect the cardiac cycle?
Which of the following is the most direct consequence of impaired calcium reuptake by the sarcoplasmic reticulum in cardiac myocytes?
Which of the following is the most direct consequence of impaired calcium reuptake by the sarcoplasmic reticulum in cardiac myocytes?
In a scenario involving complete heart block, where the atria and ventricles beat independently, what determines the ventricular contraction rate?
In a scenario involving complete heart block, where the atria and ventricles beat independently, what determines the ventricular contraction rate?
Flashcards
Cardiac Cycle
Cardiac Cycle
The cardiac cycle consists of two main phases: diastole and systole, representing the relaxation and contraction of the heart, respectively.
Study Notes
- Cardiac cycle will be discussed in two ways
- First, diagrams will be used
- Second, graphical representation of events during the cardiac cycle will be presented
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