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. 2015 Sep;17(9):1407-14.
doi: 10.1093/europace/euu361. Epub 2015 Feb 5.

Reduction in coronary microvascular resistance through cardiac resynchronization and its impact on chronic reverse remodelling of left ventricle in patients with non-ischaemic cardiomyopathy

Mitsuaki Itoh  1 , Toshiro Shinke  2 , Akihiro Yoshida  1 , Amane Kozuki  1 , Asumi Takei  1 , Koji Fukuzawa  1 , Kunihiko Kiuchi  1 , Kimitake Imamura  1 , Ryudo Fujiwara  1 , Atsushi Suzuki  1 , Tomoyuki Nakanishi  1 , Soichiro Yamashita  1 , Akinori Matsumoto  1 , Hiromasa Otake  1 , Ryoji Nagoshi  1 , Junya Shite  1 , Ken-ichi Hirata  1
Affiliations

Reduction in coronary microvascular resistance through cardiac resynchronization and its impact on chronic reverse remodelling of left ventricle in patients with non-ischaemic cardiomyopathy

Mitsuaki Itoh et al. Europace. 2015 Sep.

Abstract

Aims: Left bundle branch block (LBBB) induces mechanical dyssynchrony, thereby compromising the coronary circulation in non-ischaemic cardiomyopathy. We sought to examine the effects of cardiac resynchronization therapy (CRT) on coronary flow dynamics and left ventricular (LV) function.

Methods and results: Twenty-two patients with non-ischaemic cardiomyopathy (New York Heart Association class, III or IV; LV ejection fraction, ≤35%; QRS duration, ≥130 ms) were enrolled. One week after implantation of the CRT device, coronary flow velocity and pressure in the left anterior descending coronary artery (LAD) and left circumflex coronary artery (LCx) were measured invasively, before and after inducing hyperemia by adenosine triphosphate administration, with two programming modes: sequential atrial and biventricular pacing (BiV) and atrial pacing in patients with LBBB or sequential atrial and right ventricular pacing in patients with complete atrioventricular block (Control). We assessed hyperemic microvascular resistance (HMR, mean distal pressure divided by hyperemic average peak velocity) and the relationship between the change in HMR and mid-term LV reverse remodelling. Hyperemic microvascular resistance was lower during BiV than during Control (LAD: 1.76 ± 0.47 vs. 1.54 ± 0.45, P < 0.001; LCx: 1.92 ± 0.42 vs. 1.73 ± 0.31, P = 0.003). The CRT-induced change in HMR of the LCx correlated with the percentage change in LV ejection fraction (R = -0.598, P = 0.011) and LV end-systolic volume (R = 0.609, P = 0.010) before and 6 months after CRT.

Conclusion: Cardiac resynchronization therapy improves coronary flow circulation by reducing microvascular resistance, which might be associated with LV reverse remodelling.

Keywords: Biventricular pacing; Cardiac resynchronization therapy; Coronary circulation; Coronary microvascular resistance; Nonischaemic cardiomyopathy.

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