Additional value of dipyridamole stress myocardial perfusion by 64-row computed tomography in patients with coronary

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Tiago A Magalhães1, Roberto C Cury, Alexandre C Pereira

  • 1Cardiovascular MR and CT Section, Heart Institute (InCor), University of São Paulo Medical School, Av. Dr. Enéas de Carvalho Aguiar, 44 Andar AB, Cerqueira Cesar, São Paulo, 05403-000, Brazil.

Journal of Cardiovascular Computed Tomography
|December 8, 2011
PubMed

Insights

Adding stress myocardial CT perfusion (CTP) to coronary computed tomography angiography (CTA) significantly improves diagnostic accuracy for coronary artery disease (CAD) in patients with stents, especially when CTA alone is limited.

Area of Science:

  • Cardiology
  • Medical Imaging
  • Diagnostic Techniques

Background:

  • Coronary computed tomography angiography (CTA) is a standard tool for diagnosing coronary artery disease (CAD).
  • CTA accuracy can be reduced in coronary segments with implanted stents due to artifacts and limited evaluation.
  • Accurate assessment of stented coronary arteries is crucial for patient management.

Purpose of the Study:

  • To evaluate the added diagnostic value of stress myocardial CT perfusion (CTP) compared to coronary CTA alone.
  • To assess diagnostic performance in patients with coronary stents using invasive coronary angiography as the reference standard.
  • To determine if CTP can improve accuracy in cases with limited CTA visualization of stents.

Main Methods:

  • Combined coronary CTA and dipyridamole stress myocardial CTP were performed in 46 patients.
  • Coronary territories were assessed for stenosis (≥50%) and stent evaluation quality.
  • Diagnostic performance metrics (sensitivity, specificity, accuracy) were compared between CTA alone and CTA + CTP.

Main Results:

  • The combined use of coronary CTA and CTP achieved higher accuracy (91%) compared to CTA alone (81%) in stent territories.
  • In territories with limited or inadequate stent visualization by CTA, combined CTA + CTP showed improved diagnostic performance.
  • The diagnostic accuracy for CTA + CTP was significantly better than CTA alone, particularly in challenging stent cases (P = 0.036).

Conclusions:

  • Combined coronary CTA and stress myocardial CTP enhance diagnostic accuracy for obstructive CAD in patients with coronary stents.
  • CTP provides incremental value, especially when CTA visualization of stents is compromised.
  • This combined approach offers a more reliable assessment of coronary artery stenosis in stented segments.
Abstract

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