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Myocardial perfusion abnormality in the area of ventricular septum-free wall junction and cardiovascular events in nonobstructive hypertrophic cardiomyopathy

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Abstract

Myocardial perfusion abnormality in the left ventricle is known to be prognostic in patients with hypertrophic cardiomyopathy (HCM). Magnetic resonance imaging and necropsy studies on HCM hearts revealed myocardial lesions predominating in the area of ventricular septum-free wall junction. We assessed perfusion abnormality in this area and correlated it with the prognosis of HCM patients. We performed exercise Tc-99m tetrofosmin myocardial scintigraphy in 55 patients with nonobstructive HCM. Perfusion abnormalities were semiquantified using a 5-point scoring system in small areas of anterior junctions of basal, mid, and apical short axis views in addition to a conventional 17-segment model. All patients were prospectively followed for sudden death, cardiovascular death and hospitalization for heart failure or stroke associated with atrial fibrillation. Cardiovascular events occurred in 10 patients during an average follow-up period of 5.7 years. Stress and rest scores from anterior junction, and conventional summed stress score were significantly higher in patients with cardiovascular events than without (all P < 0.05). Anterior junction stress score of >2 produced a sensitivity of 50% and a specificity of 98% for cardiovascular events and was an independent predictor (hazard ratio 8.33; 95% confidence interval, 1.61–43.5; P = 0.01), with rest scores producing similar values, which were higher than summed stress score of >8 (5.68; 1.23–26.3; P = 0.03). The absence of myocardial perfusion abnormality in the narrow area of anterior junction differentiated HCM patients with low-risk.

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Authors and Affiliations

  1. Department of Cardiology, Matsushita Memorial Hospital, Sotojima 5-55, Moriguchi, Osaka, 570-8540, Japan

    Satoshi Kaimoto, Tatsuya Kawasaki, Michiyo Yamano, Shigeyuki Miki & Tadaaki Kamitani

  2. Kuribayashi Clinic of Cardiology, Fukuoka, Japan

    Toshiro Kuribayashi

  3. Department of Cardiovascular Medicine, Kyoto Prefectural University Graduate School of Medicine, Kyoto, Japan

    Satoshi Kaimoto, Michiyo Yamano & Hiroaki Matsubara

Authors
  1. Satoshi Kaimoto
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  2. Tatsuya Kawasaki
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  3. Toshiro Kuribayashi
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  4. Michiyo Yamano
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  5. Shigeyuki Miki
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  6. Tadaaki Kamitani
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  7. Hiroaki Matsubara
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Correspondence to Satoshi Kaimoto.

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Kaimoto, S., Kawasaki, T., Kuribayashi, T. et al. Myocardial perfusion abnormality in the area of ventricular septum-free wall junction and cardiovascular events in nonobstructive hypertrophic cardiomyopathy. Int J Cardiovasc Imaging 28, 1829–1839 (2012). https://doi.org/10.1007/s10554-011-9994-z

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  • DOI: https://doi.org/10.1007/s10554-011-9994-z

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