Pulsus paradoxus is most characteristic of which condition?

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Multiple Choice

Pulsus paradoxus is most characteristic of which condition?

Pulsus paradoxus is an exaggerated drop in systolic blood pressure during inspiration, typically more than 10 mmHg. This happens because, in conditions that restrict the heart’s filling, such as pericardial tamponade, the inspiratory increase in venous return to the right ventricle pushes the interventricular septum toward the left ventricle. That septal shift reduces left ventricular filling and stroke volume on inspiration, causing the noticeable fall in systolic pressure. Pericardial tamponade is the classic setting for this sign. The tamponade physiology also features impaired filling due to elevated intrapericardial pressure, leading to hypotension, JVE, and often muffled heart sounds. While pulsus paradoxus can occur in other situations with significant airflow obstruction (like severe asthma or COPD), it is most characteristic of tamponade. Other conditions listed don’t typically produce this same inspiratory BP drop. Heart failure can have reduced cardiac output but not the hallmark inspiratory decrease in systolic pressure. Hypertrophic cardiomyopathy involves dynamic outflow tract obstruction with murmur and timing changes, not a classic pulsus paradoxus. Atrial fibrillation causes an irregular pulse without the inspiratory variation that defines pulsus paradoxus.

Pulsus paradoxus is an exaggerated drop in systolic blood pressure during inspiration, typically more than 10 mmHg. This happens because, in conditions that restrict the heart’s filling, such as pericardial tamponade, the inspiratory increase in venous return to the right ventricle pushes the interventricular septum toward the left ventricle. That septal shift reduces left ventricular filling and stroke volume on inspiration, causing the noticeable fall in systolic pressure.

Pericardial tamponade is the classic setting for this sign. The tamponade physiology also features impaired filling due to elevated intrapericardial pressure, leading to hypotension, JVE, and often muffled heart sounds. While pulsus paradoxus can occur in other situations with significant airflow obstruction (like severe asthma or COPD), it is most characteristic of tamponade.

Other conditions listed don’t typically produce this same inspiratory BP drop. Heart failure can have reduced cardiac output but not the hallmark inspiratory decrease in systolic pressure. Hypertrophic cardiomyopathy involves dynamic outflow tract obstruction with murmur and timing changes, not a classic pulsus paradoxus. Atrial fibrillation causes an irregular pulse without the inspiratory variation that defines pulsus paradoxus.

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