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Effects of nicorandil on cardiac sympathetic nerve activity after reperfusion therapy in patients with first anterior acute myocardial infarction

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European Journal of Nuclear Medicine and Molecular Imaging Aims and scope Submit manuscript

Abstract

Purpose

Ischaemic preconditioning (PC) is a cardioprotective phenomenon in which short periods of myocardial ischaemia result in resistance to decreased contractile dysfunction during a subsequent period of sustained ischaemia. Nicorandil, an ATP-sensitive potassium channel opener, can induce PC effects on sympathetic nerves during myocardial ischaemia. However, its effects on cardiac sympathetic nerve activity (CSNA) and left ventricular remodelling have not been determined. In this study, we sought to determine whether nicorandil administration improves CSNA in patients with acute myocardial infarction (AMI).

Methods

We studied 58 patients with first anterior AMI, who were randomly assigned to receive nicorandil (group A) or isosorbide dinitrate (group B) after primary coronary angioplasty. The nicorandil or isosorbide dinitrate was continuously infused for >48 h. The extent score (ES) was determined from 99mTc-pyrophosphate scintigraphy, and the total defect score (TDS) was determined from 201Tl scintigraphy 3–5 days after primary angioplasty. The left ventricular end-diastolic volume (LVEDV) and left ventricular ejection fraction (LVEF) were determined by left ventriculography 2 weeks later. The delayed heart/mediastinum count (H/M) ratio, delayed TDS and washout rate (WR) were determined from 123I-meta-iodobenzylguanidine (MIBG) images 3 weeks later. The left ventriculography results were re-examined 6 months after treatment.

Results

Fifty patients originally enrolled in the trial completed the entire protocol. After treatment, no significant differences were observed in ES or left ventricular parameters between the two groups. However, in group A (n=25), the TDSs determined from 201Tl and 123I-MIBG were significantly lower (26±6 vs 30±5, P<0.01, and 32±8 vs 40±6, P<0.0001, respectively), the H/M ratio significantly higher (1.99±0.16 vs 1.77±0.30, P<0.005) and the WR significantly lower (36%±8% vs 44%±12%, P<0.005) than in group B (n=25). Moreover, 6 months after treatment, LVEDV and LVEF were better in group A than in group B.

Conclusion

These findings indicate that nicorandil can have beneficial effects on CSNA and left ventricular remodelling in patients with first anterior AMI.

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Authors and Affiliations

  1. Department of Cardiovascular Medicine, Gunma University School of Medicine, 3-39-15, Showa-machi, Maebashi, 371-0034, Japan

    Shu Kasama, Takuji Toyama, Tadashi Suzuki & Masahiko Kurabayashi

  2. Cardiovascular Hospital of Central Japan, Gunma, Japan

    Hisao Kumakura, Yoshiaki Takayama & Shuichi Ichikawa

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  1. Shu Kasama
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  2. Takuji Toyama
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  3. Hisao Kumakura
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  4. Yoshiaki Takayama
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  7. Masahiko Kurabayashi
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Correspondence to Shu Kasama.

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Kasama, S., Toyama, T., Kumakura, H. et al. Effects of nicorandil on cardiac sympathetic nerve activity after reperfusion therapy in patients with first anterior acute myocardial infarction. Eur J Nucl Med Mol Imaging 32, 322–328 (2005). https://doi.org/10.1007/s00259-004-1672-0

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  • DOI: https://doi.org/10.1007/s00259-004-1672-0

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