Prognostic value of myocardial perfusion imaging after first-line coronary computed tomography angiography: A multi-center cohort study

Simon Winther, Ina Trolle Andersen, Lars Christian Gormsen, Flemming Hald Steffensen, Lene Hüche Nielsen, Erik Lerkevang Grove, Axel Cosmus Pyndt Diederichsen, Grazina Urbonaviciene, Jess Lambrechtsen, Tomas Zaremba, Frank-Peter Elpert, Majed Husain, Marek Wojciech Zelechowski, Hans Erik Bøtker, Morten Bøttcher, on behalf of TheWestern Denmark Cardiac CT Study Group

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Purpose
Further diagnostic testing may be required after a coronary computed tomography angiography (CTA) showing suspected coronary stenosis. Whether myocardial perfusion imaging (MPI) provides further prognostic information post-CTA remains debated. We evaluated the prognosis for patients completing CTA stratified for post-CTA diagnostic work-up using real-world data.
Methods
We identified all patients in our uptake area with angina symptoms undergoing first-time CTA over a 10-year period. Follow-up time was a median of 3.7 years [1.9-5.8]. The primary endpoint was a composite of myocardial infarction or death. The secondary endpoint was late revascularization.
Results
During the study period 53,351 patients underwent CTA. Of these, 24 % were referred for further down-stream testing, 3,547 (7%) to MPI and 9,135 (17%) to Invasive coronary angiography (ICA). The primary and secondary endpoints occurred in 2,026 (3.8%) and 954 (1.8%) patients. Patient-characteristic-adjusted hazard ratios for the primary and secondary endpoint using patients with a normal CTA as reference were 1.37 (1.21-1.55) and 2.50 (1.93-3.23) for patient treated medically, 1.68 (1.39-2.03) and 6.13 (4.58-8.21) for patients referred to MPI and 1.94 (1.69-2.23) and 9.18 (7.16-11.78) for patients referred for ICA, respectively. Adjusted analysis with stratification for disease severity at CTA showed similar hazard ratios for patients treated medically after CTA and patients referred for MPI and treated medically after.
Conclusion
In patients completing coronary CTA, second-line MPI testing seems to identify patients at low risk of future events. MPI seems to have the potential to act as gatekeeper for ICA after coronary CTA.
Original languageEnglish
JournalJournal of Cardiovascular Computed Tomography
ISSN1934-5925
DOIs
Publication statusE-pub ahead of print - 26. Aug 2021

Keywords

  • Cardiac magnetic resonance (CMR)
  • Coronary stenosis
  • Hybrid imaging
  • Positron emission tomography (PET)
  • Single-photon emission computed tomography (SPECT)

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