Which one of the following does not cause pulsus paradoxus?: (A) Severe aoic regurgitation, (B) Cardiac tamponade, (C) Constrictive pericarditis, (D) Acute severe bronchial asthma
Answer is A. Causes of pulsus parodoxus :Cardiac - common with cardiac tamponade, infrequent with constrictive pericarditisPulmonary - bronchospasm as in severe asthma or emphysema, pulmonary embolismMiscellaneous - obesity possibility due to excessive compression of IVC at thoracic inlet, after thoracotomyHypovolemic shockSVC obstructionReversed pulsus paradoxus - inspiratory rise in aerial systolic and diastolic pressure.Seen in HOCM, during intermittent positive pressure breathing (IPPB), isometric ventricular rhythm.