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Contractility Dispersion in long QT syndrome
Iranian Cardiovascular Research Journal. 2009; 3 (3): 164-166
em Inglês | IMEMR | ID: emr-101309
ABSTRACT
Previous studies, using M mode echocardiography, provided unexpected evidence of a mechanical alteration in patients with long QT syndrome. The aim of this study was to evaluate entire left ventricular [LV] wall motion characteristics in patients with long QT syndrome using tissue Doppler imaging. We enrolled 17 patients with congenital long QT syndrome [11 female and 6 male, aged 21 to 45 years. 10 subjects without cardiac disease were also selected as control group. Two-dimensional tissue Doppler imaging [TDI] recording of the LV was obtained from the basal and mid-segments from apical four-chamber, two-chamber, and long-axis views. 'Myocaridal Contraction Duration' [MCD] was defined as the time from start of R wave on ECG to end of S wave on TDI. MCD was measured in the six LV wall positions septal, anteroseptal, lateral, inferior, posterior and anterior positions. LV contractility dispersion was significantly greater in long QT syndrome patients compared to control group [0.051 +/- 0.011 vs. 0.016 +/- 0.06; P<0.001]. Our study evaluated left ventricular dispersion of contractility duration in patients with long QT syndrome. This mechanical dispersion may be a reflection of the inhomogeneity of repolarisation in the long QT syndrome
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Índice: IMEMR (Mediterrâneo Oriental) Assunto principal: Ecocardiografia / Disfunção Ventricular Esquerda / Ultrassonografia Doppler / Contração Miocárdica Limite: Feminino / Humanos / Masculino Idioma: Inglês Revista: Iran. Cardiovasc. Res. J. Ano de publicação: 2009

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Índice: IMEMR (Mediterrâneo Oriental) Assunto principal: Ecocardiografia / Disfunção Ventricular Esquerda / Ultrassonografia Doppler / Contração Miocárdica Limite: Feminino / Humanos / Masculino Idioma: Inglês Revista: Iran. Cardiovasc. Res. J. Ano de publicação: 2009