When PEEP is set past the optimal level, which parameter is most affected?

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Study for the Mechanical Vent 2 Exam 2. Prepare with flashcards and multiple-choice questions that include detailed explanations and hints. Ace your exam with confidence!

Multiple Choice

When PEEP is set past the optimal level, which parameter is most affected?

Explanation:
Raising PEEP beyond the optimal level increases intrathoracic pressure, which reduces venous return to the heart (lower preload). With less preload, stroke volume and then cardiac output fall. In practical terms, the drop in cardiac output tends to cause a fall in arterial blood pressure, so BP decreases—the most apparent and direct effect among the options. Plateau pressure would usually rise with higher PEEP, not stay the same, and C(a-v)O2 changes are secondary responses to altered perfusion rather than the primary effect.

Raising PEEP beyond the optimal level increases intrathoracic pressure, which reduces venous return to the heart (lower preload). With less preload, stroke volume and then cardiac output fall. In practical terms, the drop in cardiac output tends to cause a fall in arterial blood pressure, so BP decreases—the most apparent and direct effect among the options. Plateau pressure would usually rise with higher PEEP, not stay the same, and C(a-v)O2 changes are secondary responses to altered perfusion rather than the primary effect.

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