Low-dose dobutamine induces left ventricular mechanical dyssynchrony in patients with dilated cardiomyopathy and a narrow QRS: A study using real-time three-dimensional echocardiography

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• 作者：Yoshimi Yagishita-Tagawa ; MD^a ; Yukio Abe ; MD^b ; ^{abeyukio@aol.com} ; Kotaro Arai ; MD^a ; Daigo Yagishita ; MD^a ; Atsushi Takagi ; MD ; FJCC^a ; Kyomi Ashihara ; MD^a ; Morio Shoda ; MD^a ; Takahiko Naruko ; MD ; FJCC^b ; Akira Itoh ; MD ; FJCC^b ; Kazuo Haze ; MD ; FJCC^b ; Junichi Yoshikawa ; MD ; FJCC^c ; Nobuhisa Hagiwara ; MD ; FJCC^a
• 关键词：Dyssynchrony ; Inotropic agents ; Echocardiography ; Heart failure ; Cardiomyopathy
• 刊名：Journal of Cardiology
• 出版年：2013
• 出版时间：April, 2013
• 年：2013
• 卷：61
• 期：4
• 页码：275-280
• 全文大小：438 K

文摘

Aims

The effects of inotropic agents on left ventricular (LV) synchrony in heart failure patients are still unknown. The purpose of this study was to investigate the effects of dobutamine on LV mechanical dyssynchrony and LV systolic performance in patients with dilated cardiomyopathy (DCM) and a narrow QRS using real-time three-dimensional echocardiography (RT3DE).

Methods and results

Thirty-three patients with idiopathic DCM and a narrow QRS underwent low-dose dobutamine stress echocardiography (LDSE) with RT3DE. A time-global LV volume curve and time-regional LV volume curves were derived from RT3DE. Regional LV stroke volumes were summed in each stage, and the dobutamine-induced increase in the sum of regional LV stroke volumes was considered as the sum of regional contractile reserve. Systolic dyssynchrony index (SDI) was calculated as follows: (standard deviation of time to minimal volume for regional LV segments) ??#xA0;100/RR duration. Among the 33 patients, low-dose dobutamine increased global LV stroke volume (SV) in 28 (85 % ), but decreased global LVSV in the remainder (15 % ). The sum of regional contractile reserve was modestly correlated with the dobutamine-induced increase in global LVSV (R = 0.57, p < 0.001). In contrast, low-dose dobutamine increased SDI in 14 (42 % ) patients without a significant change in QRS duration, and there was an inverse correlation between the increase in SDI and the increase in global LVSV induced by dobutamine (R = ?0.67, p < 0.001).

Conclusions

Dobutamine may induce LV mechanical dyssynchrony in a substantial proportion of patients with DCM and a narrow QRS. In such cases, regional LV contractile reserve does not fully contribute to an increase in global LVSV.