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[Exercise echocardiography to differentiate dilated cardiomyopathy from ischemic left ventricular dysfunction].

Jesús Peteiro Vázquez1, Lorenzo Monserrat Iglesias, Eugenia Vázquez Rey

  • 1Servicio de Cardiología Hospital Juan Canalejo, A Coruña, Spain. jpeteiro@mundo-r.com

Revista Espanola De Cardiologia
|January 29, 2003
PubMed
Summary

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Exercise echocardiography accurately differentiates ischemic left ventricular dysfunction (ILVD) from dilated cardiomyopathy (DC). Patients with ILVD showed impaired LV function during exercise, unlike those with DC, potentially reducing invasive procedures.

Area of Science:

  • Cardiology
  • Diagnostic Imaging
  • Echocardiography

Background:

  • Dobutamine echocardiography is established for differentiating dilated cardiomyopathy (DC) from ischemic left ventricular dysfunction (ILVD).
  • Exercise echocardiography (EE) has not been extensively studied for this differentiation.
  • Contractile reserve during exercise may differ between DC and ILVD patients.

Purpose of the Study:

  • To evaluate the utility of exercise echocardiography (EE) in distinguishing between dilated cardiomyopathy (DC) and ischemic left ventricular dysfunction (ILVD).
  • To test the hypothesis that DC patients exhibit greater left ventricular ejection fraction (LVEF) increase during exercise compared to ILVD patients.

Main Methods:

  • A study group of 82 patients with moderate to severe left ventricular (LV) dysfunction underwent maximal treadmill exercise echocardiography (EE).

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  • Patients were categorized into ILVD (significant coronary artery stenosis) and DC groups based on EE criteria.
  • EE criteria included changes in regional wall motion and LVEF from baseline to peak exercise.

    • Main Results:

    • The ILVD group demonstrated significantly less exercise capacity (Mets) and lower heart rate x systolic blood pressure product compared to the DC group.
    • Regional and/or global LV dysfunction occurred more frequently in ILVD patients during exercise (79% vs. 28%).
    • EE achieved 79% sensitivity and 72% specificity for detecting ILVD.

    Conclusions:

    • Exercise echocardiography is effective in identifying patients with ischemic left ventricular dysfunction (ILVD).
    • Impaired global and/or regional LV function during exercise accurately identifies ILVD.
    • This non-invasive method may decrease the necessity for invasive diagnostic procedures.