Presystolic tricuspid valve closure: an alternative mechanism of diastolic sound genesis.
We describe a previously unrecognised cause of an added diastolic heart sound. The patient had first-degree heart block and diastolic tricuspid regurgitation, leading to presystolic closure of the tricuspid valve and the production of a loud diastolic sound. Unlike previously described mechanisms for diastolic sounds, this sound was generated by the sudden acceleration of retrograde AV flow in late diastole.
Lee
C H
CH
Cardiac Department, Royal Brompton and National Heart Hospital, London, UK.
Xiao
H B
HB
Gibson
D G
DG
D000368:Aged; D003971:Diastole; D015150:Echocardiography, Doppler; D004562:Electrocardiography; D005260:Female; D006327:Heart Block / Q000503:physiopathology*; D006339:Heart Rate; D006347:Heart Sounds; D006801:Humans; D014262:Tricuspid Valve Insufficiency / Q000503:physiopathology*; D016276:Ventricular Function