Moderate rises in pleural pressure during positive-pressure ventilation have a minimal effect on cardiac output in normal subjects. What are some reasons for this lack of effect?
1) Compensatory dilation of the large arteries
2) Compensatory increase in venomotor tone
3) Compensatory increase in the cardiac rate

Question

Quizplus · Accepted Answer

Compensatory increases in venomotor tone and cardiac rate help maintain cardiac output despite moderate rises in pleural pressure during positive-pressure ventilation. Compensatory dilation of large arteries is not a primary mechanism for this effect.

Moderate Rises in Pleural Pressure During Positive-Pressure Ventilation Have a Minimal