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Single-photon emission computed tomography after nitrate administration predicts cardiac events in patients with

Wanda Acampa1, Laura Evangelista, Anna Rita Sorrentino

  • 1Department of Biomorphological Sciences, Institute of Biostructures and Bioimages of the National Council of Research, Naples, Italy.

Journal of Cardiac Failure
|November 13, 2007
PubMed

Insights

Assessing myocardial viability with nitrate SPECT in patients with prior heart attack and reduced ejection fraction can predict future cardiac events. Higher viability extent indicates increased risk for cardiac death, heart attack, or revascularization.

Area of Science:

  • Cardiology
  • Nuclear Cardiology
  • Medical Imaging

Background:

  • Patients with previous myocardial infarction and impaired left ventricular (LV) function often have residual viable myocardium.
  • Assessing myocardial viability is crucial for risk stratification and guiding treatment decisions in these patients.
  • Nitrate-enhanced single-photon emission computed tomography (SPECT) is a technique used to evaluate myocardial viability.

Purpose of the Study:

  • To determine the impact of nitrate SPECT-assessed myocardial viability on long-term cardiac events.
  • To evaluate the predictive value of viability assessment in patients with previous myocardial infarction and LV dysfunction without inducible ischemia.
  • To correlate the extent of myocardial viability with the occurrence of cardiac events.

Main Methods:

  • Ninety-three medically treated patients with prior myocardial infarction and LV ejection fraction < 40% underwent sestamibi SPECT after nitrate administration.
  • Myocardial viability was defined by the presence of at least two dysfunctional segments with preserved tracer uptake (≥55% of peak activity).
  • Cardiac events included cardiac death, myocardial infarction, and late revascularization, tracked over a mean follow-up of 43 months.

Main Results:

  • Seventy percent (65/93) of patients demonstrated evidence of myocardial viability.
  • Patients with viable myocardium experienced significantly more cardiac events (49%) compared to those without (18%) (P < .001).
  • The extent of viability was the sole predictor of cardiac events (hazard ratio 1.6; P < .0001), with event-free survival rates of 22% versus 81%.

Conclusions:

  • The presence of viable myocardium, as assessed by nitrate SPECT, is a significant predictor of major cardiac events in the long term.
  • The risk of cardiac events escalates with the extent of viable myocardium detected.
  • Nitrate SPECT imaging provides valuable prognostic information for patients with previous myocardial infarction and LV dysfunction.
Abstract

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