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Journal of Ultrasound in Medicine, Vol 13, Issue 2 129-135, Copyright © 1994 by American Institute of Ultrasound in Medicine
Gas bubble emboli detected by transcranial Doppler sonography in patients with prosthetic heart valves: a preliminary report
M. Dauzat, G. Deklunder, A. Aldis, M. Rabinovitch, F. Burte and P. M. Bret
Vascular Laboratory, Centre Hospitalier Universitaire, Nimes, France.
After observing spikes in the Doppler signal of cerebral arteries of
patients with neurologic symptoms and prosthetic heart valves, we then
studied two groups of patients with prosthetic heart valves: seven patients
with neurologic symptoms and 65 asymptomatic patients. Using transcranial
Doppler sonography of the middle cerebral artery, we found Doppler spikes
in six symptomatic and 24 asymptomatic patients with mechanical heart
valves. No spikes were found in one symptomatic and 21 asymptomatic
patients with biological valves or in 20 asymptomatic patients with
mechanical valves. We concluded that gas cavitation during the opening or
closure of the valve, producing bubble emboli, is the most probable
explanation for these Doppler spikes in patients with mechanical prosthetic
heart valves.
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