Which of the following will cause an increase in systemic vascular resistance?
A) Decrease left ventricular preload.
B) Increase right ventricular preload.
C) Increase left ventricular afterload.
D) Decrease right ventricular afterload.

Question

Quizplus · Accepted Answer

Afterload is increased when aortic pressure and systemic vascular resistance are increased,by aortic valve stenosis,and by ventricular dilation.When afterload increases,there is an increase in end-systolic volume and a decrease in stroke volume.Afterload does not immediately alter preload; however,preload changes secondarily to changes in afterload.Increasing afterload reduces stroke volume and increases left ventricular end-diastolic pressure (LVEDP)(i.e.,increases preload).This occurs because the increase in end-systolic volume is added to the venous return into the ventricle and this increases end-diastolic volume.This increase in preload activates the Frank-Starling mechanism to partially compensate for the reduction in stroke volume caused by the increase in afterload.

Which of the Following Will Cause an Increase in Systemic