The quick sniff causes some blood emptying from the inferior vena cava, a large vein that delivers blood to the right atrium. A collapse under 50% is consistent with increased right atrial pressure seen with intrathoracic abnormalities like pericardial effusion or constriction. Your RA pressure was normal. We're they looking for pericardial problems in your case?
Answered 4/22/2023
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