Which of the following are potential effects of positive-pressure ventilation on the cardiovascular system?
I.decreased venous return
II.decreased cranial perfusion pressures
III.increased pulmonary blood flow
IV.decreased ventricular stroke volume

Question

Quizplus · Accepted Answer

Positive-pressure ventilation can cause a reduction in venous return to the right atrium because the positive pressure in the thorax decreases the gradient for venous return. This can cause a decrease in ventricular stroke volume. Therefore, options I and IV are correct. Option II is incorrect because positive-pressure ventilation can increase cranial perfusion pressures. Option III is incorrect because positive-pressure ventilation can cause a redistribution of pulmonary blood flow, but it does not necessarily increase overall pulmonary blood flow.

Which of the Following Are Potential Effects of Positive-Pressure Ventilation