Clinical characteristics, myocardial perfusion deficits, and clinical outcomes of patients with non-specific chest pain hospitalized for suspected acute coronary syndrome: A 4-year prospective cohort study. (1st March 2015)

• Record Type: Journal Article
• Authors: Stochkendahl, Mette Jensen; Mickley, Hans; Vach, Werner; Aziz, Ahmed; Christensen, Henrik Wulff; Hartvigsen, Jan; Høilund-Carlsen, Poul Flemming
• Is Part Of: International journal of cardiology. Volume 182(2015)
• Page Start: 126
• Page End: 131
• Publication Date: 2015-03-01
• Subjects: Non-specific chest pain -- Myocardial perfusion imaging -- Coronary artery disease -- Prognosis -- Risk stratification -- Clinical characteristics; Cardiology -- Periodicals; Electronic journals; 616.12
• DOI: 10.1016/j.ijcard.2014.12.054
• Languages: English
• ISSNs: 0167-5273

Abstract

Abstract: Background: Although the prognostic role of stress SPECT MPI is generally well established, its value in predicting non-fatal cardiac events in patients with acute, non-specific chest pain (NSCP) remains unclear. The aims of this study are 1) to describe the baseline clinical characteristics and prevalence of myocardial perfusion (MP) deficits, by use of an adenosine stress SPECT MPI, in NSCP patients without known CAD discharged after hospitalization for suspected ACS; and 2) to prospectively describe the 4-year clinical outcome in terms of all-cause and cardiac mortality; hospitalization and coronary revascularization procedures; and cardio-vascular events in patients with and without MP deficits. Methods and results: We evaluated a series of 272 consecutive patients with acute NSCP and aged 18–75 years. ICD10-based registries were used to determine the primary outcome (a composite measure of incident CAD death, ACS, or revascularization) and two secondary outcomes (1. all-cause death; 2. a composite measure of cardiovascular death, ACS, revascularization, or stroke). Forty two (15%) participants had a MP deficit. During follow-up (median 1361 days), 7 participants had a primary event, 4 died, and 20 had a secondary composite event. Annual event rates were 0.70, 0.39 and 2.07, respectively. MP deficits predicted both subsequent primary and composite secondary events (HR: 7.54; 95% CI = [1.69; 33.69] and 2.93 (95% CI = [1.10; 7.81], respectively). Usual clinical cardiac risk classification could not meaningfully differentiate between patients with and without MP deficits. Conclusion: SPECT MPI substantially improved prediction of incident CAD beyond usual clinical procedures and risk classification systems among NSCP patients. Highlights: The prognostic role of stress SPECT MPI in predicting non-fatal cardiac events in patients with acute NSCP remains unclear. In patients with NSCP, SPECT MPI substantially improved prediction of incident coronary artery disease. Usual clinical cardiac risk classification could not meaningfully differentiate between patients with and without MP deficits.