WHAT IS IT? Drop in blood pressure of more than 10 mmHg during inspiration phase.
HOW IS IT DONE? Done via manual blood pressure cuff; inflate above SBP and then deflate slowly (1-2 mmHg per second); the first Korotkoff sound is heard during expiration and then, finally, during both. If the difference between these two pressure readings is the >10 mmHg, it is pulsus paradoxus.
Diff Dx: Used in the evaluation of cardiac tamponade (LR 3.3), pericarditis, COPD, bronchial asthma, restrictive cardiomyopathy, hemorrhagic shock, massive PE, tricuspid stenosis, and mitral stenosis.
REFERENCES
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