Which of the following physiologic effects is associated with the Valsalva maneuver?
A. increased right ventricular preload
B. decreased left ventricular afterload
C. increased cardiac output
D. increased venous return
?ANS: B
A. Incorrect response: Venous return to the right side of the heart decreases. Consequently, right ventricular preload decreases.
B. Correct response: A Valsalva maneuver involves performing an expiratory maneuver against a closed glottis. During a Valsalva maneuver, the pleural pressure increases, and the left ventricular afterload decreases.
C. Incorrect response: Because venous return to the heart decreases during a Valsalva maneuver, the cardiac output decreases.
D. Incorrect response: Because of the high pleural pressure that develops, venous return to the left ventricle decreases when a Valsalva maneuver is performed.
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