[Pre-ejection flow in the left ventricular outflow tract: a pulsed Doppler echocardiographic study].
Pre-ejection flow (PEF) has been recognized as the flow of short duration toward the cardiac base in the left ventricular outflow tract. In the present study, PEF was analyzed by pulsed Doppler echocardiography to determine the contribution of left ventricular contraction to the genesis of PEF. The study subjects consisted of 20 patients with lone atrial fibrillation (Af) and 30 patients with premature ventricular contractions (PVC) without other cardiovascular diseases. Phonocardiogram and electrocardiogram were simultaneously recorded with Doppler signal of PEF. PEF was clearly detected in only 18 patients with PVC; in the remaining 12, it was not recorded or could not be differentiated from the signals of the preceding left ventricular diastolic filling. Results were as follows: 1. PEF in the cases with sinus rhythm appeared before the Q wave; whereas, it appeared after the Q wave in the cases with Af or PVC, and the peak of PEF coincided with the first heart sound on the phonocardiogram. 2. The duration of PEF was 93.6 +/- 15.4 msec in sinus rhythm, 60.6 +/- 14.2 msec in Af, and 87.5 +/- 19.4 msec in PVC. 3. Peak velocities of PEF in Af and PVC were significantly less than peak velocity of PEF in sinus rhythm. 4. Peak velocity of PEF in PVC with left bundle branch block tended to be less than that in PVC with right bundle branch block.(ABSTRACT TRUNCATED AT 250 WORDS)
Yamanaka
T
T
Department of Cardiology, Koshigaya Hospital, Dokkyo University School of Medicine.
Hayashi
T
T
Shimizu
M
M
Morooka
S
S
Takabatake
Y
Y
D001281:Atrial Fibrillation / Q000503:physiopathology*; D005117:Cardiac Complexes, Premature / Q000503:physiopathology*; D015150:Echocardiography, Doppler; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013318:Stroke Volume; D016277:Ventricular Function, Left