In advanced obstructive sleep apnea, what happens to left ventricular end-diastolic pressure and why?

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Study for the NBME Form 13 Test with our comprehensive quiz collection, featuring flashcards and multiple-choice questions to ensure your readiness. Enhance your knowledge with detailed explanations for each question.

Multiple Choice

In advanced obstructive sleep apnea, what happens to left ventricular end-diastolic pressure and why?

Explanation:
Left ventricular end-diastolic pressure mainly reflects preload, which depends on pulmonary venous return to the left atrium. In advanced obstructive sleep apnea, recurrent apneas cause hypoxemia that triggers hypoxic pulmonary vasoconstriction, increasing pulmonary vascular resistance and reducing overall pulmonary blood flow. With less blood returning to the left atrium, filling of the left ventricle at the end of diastole is diminished, so LVEDP decreases.

Left ventricular end-diastolic pressure mainly reflects preload, which depends on pulmonary venous return to the left atrium. In advanced obstructive sleep apnea, recurrent apneas cause hypoxemia that triggers hypoxic pulmonary vasoconstriction, increasing pulmonary vascular resistance and reducing overall pulmonary blood flow. With less blood returning to the left atrium, filling of the left ventricle at the end of diastole is diminished, so LVEDP decreases.

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