IBSC Certified Critical Care Paramedic (CCP-C) Practice Test

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Compared to unassisted systolic pressure, IABP assisted systolic pressure is typically lower due to what mechanism?

Higher than unassisted systolic

Lower than unassisted systolic

IABP support lowers the pressure the left ventricle has to generate during systole by deflating just before contraction, which reduces afterload. With less afterload to push against, the ventricle ejects blood more easily and at a lower systolic pressure in the aorta. The device’s inflation during diastole raises diastolic pressure to improve coronary perfusion, but that diastolic effect does not raise systolic pressure. So, the typical result is a lower systolic pressure compared with unassisted circulation.

The same as unassisted systolic

Higher systolic afterload with augmentation

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