Cardiology Quiz #6: Cardiac Output, Preload, Afterload and Stroke Volume

1. A 68-year-old male with a history of hypertension and chronic kidney disease presents to the emergency department with signs of congestive heart failure. An echocardiogram is performed, showing an increase in left ventricular end-diastolic volume. Which of the following parameters is directly increased as a result of this echocardiographic finding? 

Question 1 of 5

2. A research study is evaluating the effects of various drugs on cardiac function. One of the drugs under investigation decreases systemic vascular resistance. Which of the following effects is this drug most likely to have on cardiac output and afterload, assuming all other factors remain constant? 

Question 2 of 5

3. A 45-year-old woman with no past medical history presents with palpitations and mild shortness of breath. Her heart rate is found to be 160 beats per minute. Assuming her stroke volume remains unchanged, what immediate effect does this heart rate have on her cardiac output? 

Question 3 of 5

4. During a physiology lecture, a professor explains the mechanism of action of a class of drugs used to manage heart failure. These drugs work by inhibiting the renin-angiotensin-aldosterone system, leading to a decrease in blood volume. Which of the following best describes the immediate effect of this class of drugs on stroke volume? 

Question 4 of 5

5. A 55-year-old man is diagnosed with aortic stenosis. This condition is characterized by a narrowing of the aortic valve, which impedes blood flow from the left ventricle into the aorta. How does aortic stenosis primarily affect the heart’s function? 

Question 5 of 5


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