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Oxygenation-sensitive Cardiac MRI with Vasoactive Breathing Maneuvers for the Non-invasive Assessment of Coronary Microvascular Dysfunction
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Oxygenation-sensitive Cardiac MRI with Vasoactive Breathing Maneuvers for the Non-invasive Assessment of Coronary Microvascular Dysfunction

Published on: August 17, 2022

Vasodilator stress impairs the left ventricular function obtained with gated single-photon emission computed

Keiichi Odagiri1, Masashi Machii, Takamitsu Tanaka

  • 1Division of Cardiology, Internal Medicine III, Hamamatsu University School of Medicine, Hamamatsu, Japan. k-altair@nifty.com

Circulation Journal : Official Journal of the Japanese Circulation Society
|October 23, 2010
PubMed

Insights

Vasodilator stress, unlike exercise stress, can decrease left ventricular ejection fraction (LVEF) and should be carefully interpreted for detecting coronary artery disease (CAD). Transient ischemic dilatation (TID) findings may be less reliable with vasodilator stress.

Area of Science:

  • Cardiology
  • Nuclear Cardiology
  • Cardiovascular Imaging

Background:

  • Transient ischemic dilatation (TID) and post-stress left ventricular (LV) dysfunction are key indicators of severe coronary artery disease (CAD).
  • Understanding the impact of different stress modalities on these markers is crucial for accurate diagnosis.

Purpose of the Study:

  • To compare the effects of vasodilator-induced stress versus exercise-induced stress on LV measurements.
  • To clarify how stressor type influences TID and post-stress LV dysfunction in patients undergoing myocardial perfusion imaging.

Main Methods:

  • Retrospective analysis of 689 patients undergoing technetium-99m tetrofosmin myocardial perfusion imaging.
  • Patients were divided into vasodilator (n=236) or exercise (n=453) stress groups.
  • Left ventricular (LV) volumes and ejection fraction (LVEF) were assessed using ECG-gated SPECT imaging.

Main Results:

  • Vasodilator stress led to increased LV end-diastolic and end-systolic volumes and decreased LVEF, irrespective of perfusion defects.
  • Vasodilator stress and summed difference score (SDS) were independent predictors of reduced LVEF post-stress.
  • Exercise stress showed a higher LVESVI stress-to-rest ratio in patients with reversible defects, unlike vasodilator stress.

Conclusions:

  • Vasodilator stress alone can induce a decrease in LVEF.
  • Transient ischemic dilatation (TID) requires careful interpretation in the context of vasodilator stress for severe CAD detection.
Abstract

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