Author Question: Moderate rises in pleural pressure during positive-pressure ventilation have a minimal effect on ... (Read 105 times)

jho37 · **on:** Jul 16, 2018

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
a. 2 and 3 only
b. 1 and 2 only
c. 1, 2, and 3
d. 1 and 3 only

Question 2

Which of the following parameters are set when volume-supported ventilation (VSV) is used? 1. Tidal volume 2. Maximum peak pressure 3. Positive end expiratory pressure (PEEP) 4. Flow

a. 1 and 3 only
b. 2 only
c. 1, 2, 3, and 4
d. 1, 2, and 3 only

Koolkid240 · **Reply #1 on:** Jul 16, 2018

Answer to Question 1

ANS: A
Compensatory mechanisms used to counter the decrease in stroke volume include an increased heart rate, an increase in systemic vascular and peripheral venous resistance, and shunting of blood away from the kidneys and lower extremities, which results in a consistent blood pressure.

Answer to Question 2

ANS: D
In VSV, a desired tidal volume, maximum peak pressure, FiO2, and PEEP are set.