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Discordance between exercise SPECT lung Tl-201 uptake and left ventricular transient ischemic dilation in patients

Doumit Daou1, Carlos Coaguila, Nicolas Delahaye

  • 1Department of Nuclear Medicine, Lariboisière University Hospital, AP-HP, Paris, France. doumit.daou@lrb.ap-hop-paris.fr

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

Insights

Patients with increased left ventricular transient ischemic dilation (LVTID) alone show more frequent ischemia than those with increased lung-to-heart (L/H) ratio alone, despite similar coronary artery disease extent. LVTID is linked to postexercise LV volume.

Area of Science:

  • Cardiology
  • Nuclear Cardiology
  • Diagnostic Imaging

Background:

  • Coronary artery disease (CAD) patient characteristics with discordant exercise thallium-201 SPECT lung uptake (lung-to-heart [L/H] ratio) and left ventricular (LV) transient ischemic dilation (LVTID) are not well defined.
  • Understanding these discordant patterns is crucial for accurate ischemia assessment in CAD patients.

Purpose of the Study:

  • To define the characteristics of patients with discordant exercise thallium-201 SPECT lung uptake and LV transient ischemic dilation.
  • To compare ischemic burden and angiographic extent of CAD in patients with isolated increased L/H ratio versus isolated increased LVTID.

Main Methods:

  • Analysis of 310 patients undergoing exercise Tl-201 SPECT and coronary angiography.
  • Subclassification into four groups: increased L/H ratio only, increased LVTID only, both, and neither.
  • Correlation analysis between L/H ratio, LVTID, summed scores, and LV volumes.

Main Results:

  • L/H ratio weakly correlated with LVTID (r=0.18).
  • L/H ratio correlated with summed scores and rest/stress LV volumes, while LVTID correlated with summed difference score and stress LV volume.
  • Increased LVTID only was associated with more frequent and extensive ischemia compared to increased L/H ratio only, with similar angiographic CAD extent.

Conclusions:

  • Patients with increased LVTID alone exhibit more frequent ischemia than those with increased L/H ratio alone, despite similar angiographic CAD extent.
  • Increased L/H ratio correlates with both rest and postexercise LV volumes.
  • Increased LVTID correlates specifically with postexercise LV volume, suggesting distinct pathophysiological mechanisms.
Abstract

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