Anatomic correlates of a normal perfusion scan using 64-slice computed tomographic coronary angiography

Jacob M van Werkhoven1, Joanne D Schuijf, J Wouter Jukema

  • 1Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands. j.m.van_werkhoven@lumc.nl

Insights

Myocardial perfusion imaging (MPI) can appear normal even with coronary artery disease (CAD). Multislice computed tomography (MSCT) can reveal anatomic findings in patients with normal MPI, though high-risk CAD is rare.

Area of Science:

  • Cardiology
  • Radiology
  • Medical Imaging

Background:

  • Myocardial perfusion imaging (MPI) and multislice computed tomography (MSCT) are diagnostic tools for coronary artery disease (CAD).
  • MSCT can detect early atherosclerosis before myocardial perfusion abnormalities appear.
  • Normal MPI results do not always exclude significant CAD, including high-risk conditions like left main or 3-vessel disease.

Purpose of the Study:

  • To evaluate the range of coronary artery anatomic findings using MSCT in patients with normal MPI results.
  • To determine the prevalence of normal coronary arteries, nonobstructive CAD, and obstructive CAD in patients with normal MPI.
  • To assess the occurrence of high-risk CAD (left main and 3-vessel disease) in this patient group.

Main Methods:

  • 180 patients presenting with chest pain underwent both MPI (gated single-photon emission computed tomography) and 64-slice MSCT.
  • Coronary artery anatomy was assessed by MSCT in patients with normal MPI findings.
  • Prevalence of normal arteries, nonobstructive CAD, obstructive CAD, and high-risk CAD was determined.

Main Results:

  • Of 97 patients with normal MPI, 38 (39%) had normal coronary anatomy.
  • Nonsignificant CAD was found in 37 patients (38%), and significant CAD in 18 patients (19%).
  • Only 4 patients (4%) had high-risk CAD (2 left main, 2 three-vessel disease).

Conclusions:

  • Normal MPI results can coexist with a spectrum of coronary artery disease, from normal anatomy to obstructive CAD.
  • MPI alone cannot rule out the presence of nonobstructive or obstructive coronary artery disease.
  • High-risk coronary artery disease was uncommon in patients with normal MPI findings.

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