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The hemodynamic effect of dobutamine stress on myocardial bridging-mural coronary artery / 中华心血管病杂志
Chinese Journal of Cardiology ; (12): 899-901, 2006.
Artigo em Chinês | WPRIM | ID: wpr-238494
ABSTRACT
<p><b>OBJECTIVE</b>Patient with myocardial bridging (MB) usually has a benign prognosis, but some MB patients might experience myocardial ischemia, infarction and sudden cardiac death, especially during active physical activities. The purpose of the study was to study the stress-induced blood flow changes of the mural coronary artery in MB patients determined by intracoronary Doppler.</p><p><b>METHODS</b>In 8 patients with MB, the basic average peak velocity (bAPV), hyperemic average peak velocity (hAPV) of blood flow, coronary flow reverse (CFR) proximal and distal to the mural coronary artery were measured before and during intravenously dobutamine (10 microg kg-1 min-1, then add 10 microg kg-1 min-1 at 3 min interval till 40 microg kg-1 min-1) by intracoronary Doppler.</p><p><b>RESULTS</b>The baseline mural coronary diameter reduction was (51.7+/-21.4)% and significantly increased to (90.0+/-12.7)% (P<0.01) during dobutamine infusion. bAPV on the segments proximal and distal to the mural coronary artery significantly increased from (19.83+/-5.84) cm/s and (20.75+/-4.91) cm/s to (31.52+/-10.93) cm/s and (30.46+/-9.01) cm/s (all P<0.05 vs. baseline) respectively post dobutamine infusion. CFR measured at proximal and distal to myocardial bridging also significantly decreased from (2.91+/-0.62) and (2.46+/-0.82) to (2.17+/-0.66) and (1.83+/-0.51) (all P<0.01).</p><p><b>CONCLUSION</b>Stress can significantly increase the compression of intramural coronary artery and reduce CFR on coronary segments both proximal and distal to the MB. Thus, active exercise might induce myocardial ischemia in patients with myocardial bridging.</p>
Assuntos
Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Farmacologia / Velocidade do Fluxo Sanguíneo / Cardiotônicos / Circulação Coronária / Anomalias dos Vasos Coronários / Vasos Coronários / Dobutamina Limite: Feminino / Humanos / Masculino Idioma: Chinês Revista: Chinese Journal of Cardiology Ano de publicação: 2006 Tipo de documento: Artigo

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Texto completo: DisponíveL Índice: WPRIM (Pacífico Ocidental) Assunto principal: Farmacologia / Velocidade do Fluxo Sanguíneo / Cardiotônicos / Circulação Coronária / Anomalias dos Vasos Coronários / Vasos Coronários / Dobutamina Limite: Feminino / Humanos / Masculino Idioma: Chinês Revista: Chinese Journal of Cardiology Ano de publicação: 2006 Tipo de documento: Artigo