M. Okamoto et al., TIME-INTERVAL DETERMINATION FROM LEFT ATRIAL APPENDAGE EJECTION FLOW IN PATIENTS WITH MITRAL-STENOSIS, Journal of clinical ultrasound, 25(3), 1997, pp. 97-102
Citations number
23
Categorie Soggetti
Radiology,Nuclear Medicine & Medical Imaging",Acoustics
The feasibility of determining the time interval from left atrial appe
ndage (LAA) flow was examined using transesophageal Doppler echocardio
graphy. Time intervals were compared between LAA flow and mitral flow
patterns during late diastole in 8 patients with mitral stenosis and i
n 12 controls. The start of ejection flow from the LAA was later than
the initiation of mitral flow, but the termination was same in both fl
ows, indicating the contribution of LAA ejection to the latter half of
the left atrial booster pump function. The pre-ejection time and the
time interval from P-wave to end-ejection correlated significantly wit
h left atrial dimensions (r = 0.55, and r = 0.70, respectively). The p
re-ejection time, duration of the ejection flow from the LAA, and dura
tion of mitral flow in the atrial contraction phase were significantly
longer in patients with mitral stenosis (126 +/- 14 msec, 131 +/- 36
msec, and 167 +/- 28 msec, respectively) than in the controls (109 +/-
13 msec, 108 +/- 15 msec, and 141 +/- 17 msec, respectively). These r
esults indicate that electrical conduction time from the right atrium
to LAA can be estimated from the LAA ejection flow, and the time is re
lated to the left atrial size. In patients with mitral stenosis, LAA c
ontraction may contribute to left ventricular filling in the latter ha
lf of the atrial contraction phase. (C) 1997 John Wiley & Sons, Inc.