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Characteristics of idiopathic ventricular tachycardia originating above the pulmonary valve

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Abstract

Panoptic studies of ventricular tachycardia (VT) originating above the pulmonary valve are scarce. The purpose of this study is to clarify the characteristic of idiopathic VT arising above pulmonary valve. We analyzed 15 consecutive patients with idiopathic VT that was successfully abolished by catheter ablation at the right ventricular outflow tract (RVOT-VT, n = 11) and above the pulmonary valve (PA-VT, n = 4). Incidence of syncope was higher in PA-VT than RVOT-VT (100 vs 27 %, P < 0.05) and polymorphic VT was also more prevalent in PA-VT (75 vs 0 %, P < 0.05). The coupling interval (315 ± 29 vs 449 ± 32 ms, mean ± SE) at the onset of VT and minimum cycle length (CL) (192 ± 13 vs 344 ± 37 ms) during VT were shorter in PA-VT (both P < 0.05). Among 12-lead ECG parameters, only R-wave amplitude in lead II was different between groups (2.05 ± 0.17 mV in PA-VT vs 1.44 ± 0.05 mV in RVOT-VT, P < 0.005). At the successful ablation site, the activation time from the onset of QRS complex did not differ between groups (−37 ± 3 vs −31 ± 4, P = 0.405), whereas, the amplitude of intracardiac electrograms was significantly lower in PA-VT (0.83 ± 0.38 mV vs 2.39 ± 0.36 mV, P < 0.05). Although the number of patients in this study is limited, VT originating above the pulmonary valve demonstrated rapid excitation and often degenerated into polymorphic VT, suggesting its malignant electrophysiological characteristics.

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Acknowledgments

We thank Dr. Masayuki Sakurai, Director of Hokko Memorial Hospital, for constant encouragement of this study.

Conflict of interest

We declare that we have no conflict of interest.

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Authors and Affiliations

  1. Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine, Kita-15, Nishi-7, Kita-ku, Sapporo, 060-8638, Japan

    Hisashi Yokoshiki, Kazuya Mizukami, Hirofumi Mitsuyama, Masaya Watanabe, Taro Tenma & Hiroyuki Tsutsui

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  1. Hisashi Yokoshiki
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  2. Kazuya Mizukami
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  3. Hirofumi Mitsuyama
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  4. Masaya Watanabe
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  6. Hiroyuki Tsutsui
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Correspondence to Hisashi Yokoshiki.

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Yokoshiki, H., Mizukami, K., Mitsuyama, H. et al. Characteristics of idiopathic ventricular tachycardia originating above the pulmonary valve. Heart Vessels 31, 599–607 (2016). https://doi.org/10.1007/s00380-015-0653-5

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