title: Obstructive sleep apnea is a false-negative cause of flow velocity paradoxus in pericardial effusion: case report.
abstract: We report on a patient with obstructive sleep apnea in whom percutaneous transmyocardial revascularization was complicated by hemopericardium. Absence of phasic variation in the transmitral and transtricuspid Doppler inflow velocities during apneic episodes and marked variation during spontaneous respiration were identified with a respirometer, and helped us identify a novel false-negative cause of flow velocity paradoxus.
authors.affiliation: Division of Cardiology, Case Western Reserve University, 11100 Euclid Avenue, Cleveland, OH 44106-5029, USA. bdh6@po.cwru.edu
authors.forename: H
authors.initials: H
authors.lastname: Paydak
authors.forename: R
authors.initials: R
authors.lastname: Nair
authors.forename: B D
authors.initials: BD
authors.lastname: Hoit
mesh_terms: D000368:Aged; D001783:Blood Flow Velocity / Q000502:physiology*; D015150:Echocardiography, Doppler; D005188:False Negative Reactions; D006801:Humans; D008297:Male; D010490:Pericardial Effusion / Q000175:diagnosis* / Q000209:etiology* / Q000503:physiopathology; D020181:Sleep Apnea, Obstructive / Q000150:complications* / Q000175:diagnosis* / Q000503:physiopathology