title: Long-term prognosis and risk heterogeneity of heart failure complicating acute myocardial infarction.
abstract: The Killip classification of acute heart failure was developed decades ago to predict short-term mortality in patients with acute myocardial infarction (AMI). The aim of this study was to determine the long-term prognosis of acute heart failure graded according to the Killip classification in 15,235 unselected patients hospitalized for AMI from 2000 to 2005. Vital status for each patient was ascertained, through to March 1, 2012, from linkage with national death records. A stepwise gradient in the adjusted hazard ratio (HR) for 12-year mortality was observed with increasing Killip class: class I (n = 10,123), HR 1.00 (reference group); class II (n = 2,913), HR 1.13 (95% confidence interval [CI] 1.06 to 1.21); class III (n = 1,217) HR 1.49 (95% CI 1.37 to 1.62); and class IV (n = 898), HR 2.80 (95% CI 2.53 to 3.10). Unexpectedly, in a landmark analysis excluding deaths <30 days after admission, patients in Killip class IV had lower adjusted long-term mortality than those in class III. The adjusted HR for 12-year mortality comparing Killip class IV with Killip class III in patients <60 years of age was 1.71 (95% CI 1.33 to 2.19, p <0.001) and in patients >60 years of age was 2.30 (95% CI 2.07 to 2.56, p <0.001). In conclusion, on the basis of simple clinical features, the Killip classification robustly predicted 12-year mortality after AMI. The heterogeneity in early versus late risk in patients with Killip class IV heart failure underscores the importance of appropriate early treatment in cardiogenic shock.
authors: National University Heart Centre, National University of Singapore, Singapore, Singapore; Albert Einstein Hospital, Sao Paulo, Brazil.
authors: Leonardo P
authors: LP
authors: de Carvalho
authors: National Heart Centre, Singapore, Singapore; Center for Quantitative Medicine, Duke-NUS Graduate Medical School, Singapore, Singapore.
authors: Fei
authors: F
authors: Gao
authors: National Heart Centre, Singapore, Singapore.
authors: Qifeng
authors: Q
authors: Chen
authors: National Heart Centre, Singapore, Singapore.
authors: Ling-Ling
authors: LL
authors: Sim
authors: National Heart Centre, Singapore, Singapore.
authors: Tian-Hai
authors: TH
authors: Koh
authors: Tan Tock Seng Hospital, Singapore, Singapore.
authors: David
authors: D
authors: Foo
authors: Khoo Teck Puat Hospital, Singapore, Singapore.
authors: Hean-Yee
authors: HY
authors: Ong
authors: Changi General Hospital, Singapore, Singapore.
authors: Khim-Leng
authors: KL
authors: Tong
authors: National University Heart Centre, National University of Singapore, Singapore, Singapore.
authors: Huay-Cheem
authors: HC
authors: Tan
authors: National University Heart Centre, National University of Singapore, Singapore, Singapore.
authors: Tiong-Cheng
authors: TC
authors: Yeo
authors: National Registry of Disease Office, Health Promotion Board, Singapore, Singapore.
authors: Khuan-Yew
authors: KY
authors: Chow
authors: National University Heart Centre, National University of Singapore, Singapore, Singapore.
authors: A Mark
authors: AM
authors: Richards
authors: Duke Clinical Research Institute, Durham, North Carolina.
authors: Eric D
authors: ED
authors: Peterson
authors: National Heart Centre, Singapore, Singapore.
authors: Terrance
authors: T
authors: Chua
authors: National University Heart Centre, National University of Singapore, Singapore, Singapore. Electronic address: mark_chan@nuhs.edu.sg.
authors: Mark Y
authors: MY
authors: Chan
mesh_terms: D000368:Aged; D002423:Cause of Death; D004562:Electrocardiography; D005260:Female; D005500:Follow-Up Studies; D006333:Heart Failure / Q000453:epidemiology* / Q000209:etiology; D017052:Hospital Mortality / Q000639:trends; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000150:complications* / Q000175:diagnosis / Q000453:epidemiology; D011379:Prognosis; D012189:Retrospective Studies; D018570:Risk Assessment / Q000379:methods*; D012846:Singapore / Q000453:epidemiology; D015996:Survival Rate / Q000639:trends; D013997:Time Factors