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Influence of oxygen ventilation on Doppler microemboli signals in patients with artificial heart valves

The purpose of this study was to evaluate the influence of inhalation of 100% oxygen on microembolic signal (MES) counts in patients with artificial cardiac valves. A total of 134 outpatients were examined. Transcranial Doppler baseline monitoring (45-minute duration) was performed in all patients u...

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Published in:Stroke (1970) 1997-11, Vol.28 (11), p.2189-2194
Main Authors: GEORGIADIS, D, WENZEL, A, LEHMANN, D, LINDNER, A, ZERKOWSKI, H. R, ZIERZ, S, SPENCER, M. P
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cited_by cdi_FETCH-LOGICAL-c389t-147b09102398de02803ce5504d925d0175ebb5c77c895307d1f20fb398a99f893
cites cdi_FETCH-LOGICAL-c389t-147b09102398de02803ce5504d925d0175ebb5c77c895307d1f20fb398a99f893
container_end_page 2194
container_issue 11
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container_title Stroke (1970)
container_volume 28
creator GEORGIADIS, D
WENZEL, A
LEHMANN, D
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SPENCER, M. P
description The purpose of this study was to evaluate the influence of inhalation of 100% oxygen on microembolic signal (MES) counts in patients with artificial cardiac valves. A total of 134 outpatients were examined. Transcranial Doppler baseline monitoring (45-minute duration) was performed in all patients under resting conditions. The first 30 patients subsequently underwent transcranial Doppler monitoring for at least 20 minutes under noninvasive positive pressure ventilation with 100% oxygen and for an additional 30 minutes under resting conditions. The same protocol was applied to all following patients with a baseline MES count > or = 10, while the examination was discontinued in the remaining patients. Baseline MES counts < 10, which remained unchanged during oxygen inhalation and the subsequent resting period, were observed in 26 of 30 initial patients. A total of 46 patients with MES counts > or = 10 were identified. Oxygen application was feasible in 43 patients. An exponential MES decrease was noted in 42 patients during oxygen inhalation (statistically significant in 38 patients), followed by a subsequent increase in 38 of 43 patients (statistically significant in 25 patients) under resting conditions. The exponential reduction of MES counts observed in this study corresponds to blood denitrogenation, thus strongly arguing for nitrogen bubbles as underlying embolic material in prosthetic valve carriers.
doi_str_mv 10.1161/01.STR.28.11.2189
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identifier ISSN: 0039-2499
ispartof Stroke (1970), 1997-11, Vol.28 (11), p.2189-2194
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1524-4628
language eng
recordid cdi_proquest_miscellaneous_79406909
source Alma/SFX Local Collection
subjects Adolescent
Adult
Aged
Aged, 80 and over
Biological and medical sciences
Coronary Disease - diagnostic imaging
Coronary Disease - etiology
Embolism - diagnostic imaging
Embolism - etiology
Female
Heart Valve Prosthesis - adverse effects
Humans
Investigative techniques, diagnostic techniques (general aspects)
Male
Medical sciences
Middle Aged
Nervous system
Oxygen
Positive-Pressure Respiration
Respiration
Ultrasonic investigative techniques
Ultrasonography
title Influence of oxygen ventilation on Doppler microemboli signals in patients with artificial heart valves
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