Hypovolemic shock reduces stroke volume mainly due to a decrease in which parameter?

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Prepare for the Pediatric Cardiac Arrest Test using flashcards and multiple choice questions. Each question is accompanied by helpful hints and detailed explanations to ensure you're ready for the exam!

Multiple Choice

Hypovolemic shock reduces stroke volume mainly due to a decrease in which parameter?

Explanation:
In hypovolemic shock, the primary event is a loss of circulating blood volume, which directly lowers venous return to the heart. With less blood returning during diastole, the end-diastolic volume ( preload) decreases, so the heart fibers are less stretched when they contract. According to the Frank-Starling relationship, this reduced stretch translates into a weaker contraction and a smaller stroke volume. Even though the body may compensate by increasing heart rate and vasoconstriction (which can raise afterload), these changes can’t fully overcome the drop in filling, so stroke volume falls mainly because preload is reduced.

In hypovolemic shock, the primary event is a loss of circulating blood volume, which directly lowers venous return to the heart. With less blood returning during diastole, the end-diastolic volume ( preload) decreases, so the heart fibers are less stretched when they contract. According to the Frank-Starling relationship, this reduced stretch translates into a weaker contraction and a smaller stroke volume. Even though the body may compensate by increasing heart rate and vasoconstriction (which can raise afterload), these changes can’t fully overcome the drop in filling, so stroke volume falls mainly because preload is reduced.

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