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Gated single-photon emission computed tomography detects subendocardial ischemia in hypertrophic cardiomyopathy

Tatsuya Kawasaki1, Yoshiki Akakabe, Michiyo Yamano

  • 1Department of Cardiology, Matsushita Memorial Hospital, Moriguchi, Osaka, Japan. js-k@wf6.so-net.ne.jp

Circulation Journal : Official Journal of the Japanese Circulation Society
|January 26, 2007
PubMed

Insights

Gated single-photon emission computed tomography (SPECT) effectively detects exercise-induced subendocardial ischemia (SEI) in hypertrophic cardiomyopathy (HCM) patients. Changes in left ventricular end-systolic volume are key indicators for identifying SEI during exercise.

Area of Science:

  • Cardiology
  • Nuclear Medicine
  • Medical Imaging

Background:

  • Hypertrophic cardiomyopathy (HCM) can lead to subendocardial ischemia (SEI) in the left ventricle (LV).
  • Assessing exercise-induced SEI in HCM patients is crucial for management.

Purpose of the Study:

  • To evaluate the utility of volumetric variables from gated single-photon emission computed tomography (SPECT) in detecting exercise-induced SEI.
  • To determine if SPECT-derived volumetric data can identify SEI in HCM patients.

Main Methods:

  • Exercise 99mTc-tetrofosmin myocardial scintigraphy performed on 26 HCM patients.
  • Quantification of SEI and correlation with volumetric variables using Quantitative Gated SPECT software.
  • Analysis of exercise-induced percentage changes in LV end-systolic and end-diastolic volumes.

Main Results:

  • HCM patients with SEI showed a significantly higher exercise-induced percentage change in LV end-systolic volume (25.8%) compared to those without (10.0%).
  • No significant difference in LV end-diastolic volume changes was observed between groups.
  • An optimal cutoff of 17% change in LV end-systolic volume demonstrated 89% sensitivity and 82% specificity for SEI detection.

Conclusions:

  • Gated SPECT is a valuable tool for detecting exercise-induced SEI in a specific group of HCM patients.
  • Left ventricular end-systolic volume changes are reliable indicators of SEI during exercise in HCM.
Abstract

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