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NBME 24 Answers

nbme24/Block 1/Question#48 (22.1 difficulty score)
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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xxabi  Great explanation - I think you have a minor typo, LVEDV will be increased* bc SV is decreased +15  
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. +5  



Radshopeful had a good explanation but a few typos may confuse people, so to recap:

The patient is suffering from systolic HF secondary to chronic HTN. The LV has lost contractile function (decreased LV systolic function from Qstem) which leads to decreased SV (and subsequently decreased CO since CO = HR x SV, the HR in this patient is also within normal limits). Finally, LVEDV is the amount of volume left in the LV at the end of diastole (or filling) and since the blood from systole was not able to be pumped forward efficiently (decreased SV) this leftover blood will cause this value to be increased.