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NBME 24 Answers

nbme24/Block 1/Question#48

A 70-year-old man is brought to the emergency ...

Stroke volume: decreased;
Left ventricular end-diastolic volume: increased;
Cardiac output: decreased

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This patient has decompensated left heart failure. Decompensation occurs because of the hearts inability to keep up with demand any longer. This leads to a decrease in SV mainly because of a contractile issue which leads to a decrease in CO (CO = SV x HR). Lastly, the LVEDV will be decreased because the SV is decreased leaving more blood in the left ventricle after systole since it cannot be pumped forward. Hope this helps!!

xxabi  Great explanation - I think you have a minor typo, LVEDV will be increased* bc SV is decreased +6  
smoothie  More blood left in the ventricle after systole is LVESV. I thought LVEDV increases because more blood remains after systole and on top of that blood from left atria from diastole is now also added. +