title: Comparison of outcomes of patients with painless versus painful ST-segment elevation myocardial infarction undergoing percutaneous coronary intervention.
abstract: There are few data available on the prognosis of painless ST-segment elevation myocardial infarction (STEMI). The aim of this study was to determine the incidence, clinical characteristics, and outcomes of painless STEMI. We analyzed the Korea Acute Myocardial Infarction Registry (KAMIR) study, which enrolled 7,288 patients with STEMI (61.8 ± 12.8 years old, 74% men; painless STEMI group, n = 763; painful STEMI group, n = 6,525). End points were in-hospital mortality and 1-year major adverse cardiac events (MACEs). Patients with painless STEMI were older and more likely to be women, nonsmokers, diabetic, and normolipidemic and to have a higher Killip class. The painless group had more in-hospital deaths (5.9% vs 3.6%, p = 0.026) and 1-year MACEs (26% vs 19%, p = 0.002). In Cox proportional hazards analysis, hypotension (hazard ratio [HR] 4.40, 95% confidence interval [CI] 1.41 to 13.78, p = 0.011), low left ventricular ejection fraction (HR 3.12, 95% CI 1.21 to 8.07, p = 0.019), and a high Killip class (HR 3.48, 95% CI 1.19 to 10.22, p = 0.023) were independent predictors of 1-year MACEs in patients with painless STEMI. In conclusion, painless STEMI was associated with more adverse outcomes than painful STEMI and late detection may have contributed significantly to total ischemic burden. These results warrant more investigations for methodologic development in the diagnosis of silent ischemia and painless STEMI.
authors.affiliation: Chonnam National University Hospital, Gwangju, South Korea.
authors.forename: Jae Yeong
authors.initials: JY
authors.lastname: Cho
authors.forename: Myung Ho
authors.initials: MH
authors.lastname: Jeong
authors.forename: Young Keun
authors.initials: YK
authors.lastname: Ahn
authors.forename: Jong Hyun
authors.initials: JH
authors.lastname: Kim
authors.forename: Shung Chull
authors.initials: SC
authors.lastname: Chae
authors.forename: Young Jo
authors.initials: YJ
authors.lastname: Kim
authors.forename: Seung Ho
authors.initials: SH
authors.lastname: Hur
authors.forename: In Whan
authors.initials: IW
authors.lastname: Seong
authors.forename: Taek Jong
authors.initials: TJ
authors.lastname: Hong
authors.forename: Dong Hoon
authors.initials: DH
authors.lastname: Choi
authors.forename: Myeong Chan
authors.initials: MC
authors.lastname: Cho
authors.forename: Chong Jin
authors.initials: CJ
authors.lastname: Kim
authors.forename: Ki Bae
authors.initials: KB
authors.lastname: Seung
authors.forename: Wook Sung
authors.initials: WS
authors.lastname: Chung
authors.forename: Yang Soo
authors.initials: YS
authors.lastname: Jang
authors.forename: Seung Yun
authors.initials: SY
authors.lastname: Cho
authors.forename: Seung Woon
authors.initials: SW
authors.lastname: Rha
authors.forename: Jang Ho
authors.initials: JH
authors.lastname: Bae
authors.forename: Jeong Gwan
authors.initials: JG
authors.lastname: Cho
authors.forename: Seung Jung
authors.initials: SJ
authors.lastname: Park
mesh_terms: D000368:Aged; D015906:Angioplasty, Balloon, Coronary / Q000379:methods*; D002637:Chest Pain / Q000175:diagnosis / Q000453:epidemiology* / Q000209:etiology; D016001:Confidence Intervals; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000150:complications* / Q000503:physiopathology / Q000628:therapy; D010147:Pain Measurement; D011379:Prognosis; D016016:Proportional Hazards Models; D011446:Prospective Studies; D056910:Republic of Korea / Q000453:epidemiology