Defined as a fall in systolic BP greater than 12 mm Hg upon inspiration.
Etiologies
     Pericardial tamponade
     Severe asthma exacerbations
          However, its absence does not rule-out severe disease.
          Although initially present, a pulsus paradoxus may disappear after only minimal improvement in air flow through the larger airways.
     Tension pneumothorax

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