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Incidence and outcomes of unstable angina compared to non-ST elevation myocardial infarction

Session Poster Session 2

Speaker Christian Puelacher

Congress : ESC Congress 2019

  • Topic : coronary artery disease, acute coronary syndromes, acute cardiac care
  • Sub-topic : Unstable Angina
  • Session type : Poster Session
  • FP Number : P1695

Authors : C Puelacher (Basel,CH), M Gugala (Basel,CH), PD Adamson (Edinburgh,GB), ASV Shah (Edinburgh,GB), AR Chapmann (Edinburgh,GB), A Anand (Edinburgh,GB), J Boeddinghaus (Basel,CH), T Nestelberger (Basel,CH), R Twerenbold (Basel,CH), K Wildi (Basel,CH), M Rubini Gimenez (Basel,CH), S Osswald (Basel,CH), NL Mills (Edinburgh,GB), C Mueller (Basel,CH)

C Puelacher1 , M Gugala1 , PD Adamson2 , ASV Shah2 , AR Chapmann2 , A Anand2 , J Boeddinghaus1 , T Nestelberger1 , R Twerenbold1 , K Wildi1 , M Rubini Gimenez1 , S Osswald1 , NL Mills2 , C Mueller1 , 1University Hospital Basel, Cardiology - Basel - Switzerland , 2University of Edinburgh, BHF Center for Cardiovascular Science - Edinburgh - United Kingdom of Great Britain & Northern Ireland ,


Objective: Assess the incidence and compare characteristics and outcome of unstable angina (UA) and Non-ST-Elevation myocardial infarction (NSTEMI)

Design: Two independent prospective multicenter diagnostic studies (Advantageous Predictors of Acute Coronary Syndromes Evaluation (APACE) and High-Sensitivity Troponin in the Evaluation of Patients With Acute Coronary Syndrome (High-STEACS)) enrolling patients with acute chest discomfort presenting to the emergency department. Central adjudication of the final diagnosis was done by two independent cardiologists using all clinical information including serial measurements of high-sensitivity cardiac troponin (hs-cTn). All-cause death and future non-fatal MI were assessed at 30-days and 1-year.

Results: 8992 patients were enrolled at 11 centres. UA was adjudicated in 366/4122 (8.9%) and 137/4870 (2.8%) patients in APACE and High-STEACS, respectively, and NSTEMI in 622 (15.1%) and 651 (13.4%). Coronary artery disease was pre-existing in 73% and 76% of patients with unstable angina. At 30-days, all-cause mortality in UA was substantially lower as compared to NSTEMI (0.5% versus 3.7%, p=0.002 in APACE, 0.7% versus 7.4%, p=0.004 in High-STEACS). Similarly, at 1-year in UA all-cause mortality was 3.3% [95%CI 1.2-5.3] vs 10.4% [7.9-12.9] in APACE, and 5.1% [0.7-9.5] vs 22.9% [19.3-26.4] in High-STEACS, and similar to non-cardiac chest pain (NCCP). In contrast, future non-fatal MI in APACE was comparable in UA and NSTEMI (11.2%, [7.8-14.6] and 7.9%, [5.7-10.2]), and higher than in NCCP (0.6%, [0.2-1.0]).

Conclusions: The incidence and the mortality of UA is substantially lower than that of NSTEMI, while the rate of future non-fatal MI is similar.

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