QuestionDecember 14, 2025

During congestive heart failure due to a leaky aortic valve you'd expect to see which of the following changes to Wiggers Diagram? A larger volume of blood in the ventricle during diastole A decrease in the interval between successive P waves An increase in the length of diastole A decrease in blood leaving the ventricle during systole (as compared to a normal animal) An increase in the amount of blood leaving the left ventricle D An increase in the amount of blood leaving the right ventricle (if the chart was created using blood flow and pressures on the right instead of the left side of the hea

During congestive heart failure due to a leaky aortic valve you'd expect to see which of the following changes to Wiggers Diagram? A larger volume of blood in the ventricle during diastole A decrease in the interval between successive P waves An increase in the length of diastole A decrease in blood leaving the ventricle during systole (as compared to a normal animal) An increase in the amount of blood leaving the left ventricle D An increase in the amount of blood leaving the right ventricle (if the chart was created using blood flow and pressures on the right instead of the left side of the hea
During congestive heart failure due to a leaky aortic valve you'd expect to see which of the following changes to Wiggers Diagram? A larger volume of blood in the ventricle during diastole A decrease in the interval between successive P waves An increase in the length of diastole A decrease in blood leaving the ventricle during systole (as compared to a normal animal) An increase in the amount of blood leaving the left ventricle D An increase in the amount of blood leaving the right ventricle (if the chart was created using blood flow and pressures on the right instead of the left side of the hea

Solution
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Answer

A larger volume of blood in the ventricle during diastole Explanation 1. Identify the physiological change A **leaky aortic valve (aortic regurgitation)** allows blood to flow back from the aorta into the left ventricle during **diastole**, causing volume overload in the ventricle. 2. Analyze ventricular volume change Regurgitation during diastole increases **end-diastolic volume**, so the Wiggers diagram will show a **larger ventricular volume during diastole**. 3. Analyze effect on stroke volume and systolic blood leaving Although total stroke volume may seem high due to the extra volume, **effective forward flow** (blood exiting the ventricle into systemic circulation) is **reduced**, since part of the stroke volume regurgitates backward. 4. Exclude unrelated changes The **P-P interval** (heart rate) and **length of diastole** usually remain unchanged. The **right ventricle** is not directly affected in early stages.

Explanation

1. Identify the physiological change<br /> A **leaky aortic valve (aortic regurgitation)** allows blood to flow back from the aorta into the left ventricle during **diastole**, causing volume overload in the ventricle.<br /><br />2. Analyze ventricular volume change<br /> Regurgitation during diastole increases **end-diastolic volume**, so the Wiggers diagram will show a **larger ventricular volume during diastole**.<br /><br />3. Analyze effect on stroke volume and systolic blood leaving<br /> Although total stroke volume may seem high due to the extra volume, **effective forward flow** (blood exiting the ventricle into systemic circulation) is **reduced**, since part of the stroke volume regurgitates backward.<br /><br />4. Exclude unrelated changes<br /> The **P-P interval** (heart rate) and **length of diastole** usually remain unchanged. The **right ventricle** is not directly affected in early stages.
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