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Evaluation of Left Ventricular Structure and Function using 3D Echocardiography
06:34

Evaluation of Left Ventricular Structure and Function using 3D Echocardiography

Published on: October 28, 2020

Identification of exercise-induced left ventricular systolic and diastolic dysfunction using gated SPECT in patients

Kenzo Sakamoto1, Tomoki Nakamura, Kan Zen

  • 1Second Department of Medicine, Kyoto Prefectual University of Medicine, Kyoto, Japan. sk810@murakami.asahi-u.ac.jp

Journal of Nuclear Cardiology : Official Publication of the American Society of Nuclear Cardiology
|March 31, 2004
PubMed

Insights

Modified quantitative gated single photon emission computed tomography (QGS) software can detect post-exercise systolic and diastolic dysfunction in coronary artery disease patients. This imaging technique confirms cardiac dysfunction 30 minutes after stress testing.

Area of Science:

  • Cardiology
  • Nuclear Medicine
  • Medical Imaging

Background:

  • Coronary artery disease (CAD) can lead to post-stress left ventricular dysfunction.
  • Assessing systolic and diastolic function after exercise is crucial for managing CAD.
  • Early detection of cardiac dysfunction aids in timely intervention and improved patient outcomes.

Purpose of the Study:

  • To evaluate a modified quantitative gated single photon emission computed tomography (QGS) software for assessing post-stress left ventricular function.
  • To determine if systolic and diastolic dysfunction can be identified 30 minutes after exercise in CAD patients.
  • To compare the functional changes in patients with angina pectoris (AP) and myocardial infarction (MI) versus control subjects.

Main Methods:

  • Employed modified quantitative gated single photon emission computed tomography (QGS) with enhanced temporal resolution (32 frames per R-R interval).
  • Reconstructed left ventricular volume curves to derive ejection fraction (EF), peak ejection rate (PER), peak filling rate (PFR), and time to PFR (TPFR).
  • Included 28 control subjects, 26 patients with AP, and 27 patients with old MI who underwent exercise/rest gated technetium 99m tetrofosmin SPECT.

Main Results:

  • Patients with AP and MI exhibited reduced EF, PER, and PFR post-stress compared to rest.
  • Time to PFR (TPFR) was significantly prolonged in MI patients after stress.
  • Control subjects showed no significant changes in EF, PER, PFR, or TPFR between rest and post-stress conditions.

Conclusions:

  • The modified QGS software effectively identified post-stress systolic and diastolic functional changes.
  • Post-exercise systolic and diastolic dysfunction was confirmed in patients with AP and MI at 30 minutes after stress.
  • This imaging approach provides a reliable method for detecting early functional impairments in CAD.
Abstract

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