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J Echocardiogr. 2011 Sep;9(3):90-6. doi: 10.1007/s12574-011-0082-0. Epub 2011 Feb 11.

Detection of prolonged regional myocardial systolic dysfunction after exercise-induced myocardial ischemia by strain echocardiography with high frame rate tissue Doppler echocardiography.

Journal of echocardiography

Yasuhiro Takagi, Takeshi Hozumi, Yasuhiko Takemoto, Kazuaki Negishi, Zhu Hong, Kohji Abo, Kazuya Fujioka, Mitsuru Nakao, Ryo Otsuka, Kenichi Sugioka, Yoshiki Kobayashi, Hiroyuki Yamagishi, Minoru Yoshiyama, Junichi Yoshikawa

Affiliations

  1. Department of Internal Medicine and Cardiology, Osaka City University School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka, 545-8585, Japan.
  2. Department of Internal Medicine and Cardiology, Osaka City University School of Medicine, 1-4-3 Asahimachi, Abeno-ku, Osaka, 545-8585, Japan. [email protected].
  3. Central Clinical Laboratory, Osaka City University Medical School, Osaka, Japan.

PMID: 27277175 DOI: 10.1007/s12574-011-0082-0

Abstract

BACKGROUND: Strain echocardiography has enabled quantification of regional myocardial systolic function objectively and is less influenced by tethering effects and cardiac translational artifact than Doppler tissue imaging. Although strain echocardiography has been applied for the detection of inducible ischemia during dobutamine stress, it has not been fully applied to exercise stress echocardiography (ESE) because of technical difficulties. Prolonged myocardial systolic dysfunction after exercise-induced ischemia has been shown previously. Thus, we designed this study to evaluate whether the myocardial strain analysis can detect myocardial ischemia by the assessment of prolonged regional left ventricular (LV) dysfunction in ESE.

METHODS: We performed ESE with myocardial strain imaging system in 20 consecutive patients who had exercise Tl-201 single photon emission computed tomography (SPECT). Myocardial strain curves were obtained at six segments in mid LV walls from the apical approach before and 5 min after ESE. We measured the duration from the R wave in the electrocardiogram to the timing of peak systolic strain corrected by the square root of the RR interval (TPSc). We finally calculated the differences of TPSc (ΔTPSc) before ESE and 5 min after ESE. The results were compared with SPECT as a reference standard.

RESULTS: A receiver operating characteristic curve demonstrated that a ΔTPSc cutoff value of 70 ms had a sensitivity of 80% and a specificity of 84% for the detection of myocardial ischemia.

CONCLUSIONS: Prolonged regional LV systolic dysfunction assessed by ESE with strain analysis was useful for the detection of myocardial ischemia.

Keywords: Ischemic heart disease; Myocardial strain analysis; Stress echocardiography; Tissue Doppler echocardiography

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