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Expediting reperfusion during primary percutaneous coronary intervention is aimed at salvaging myocardium in ST-segment–elevation myocardial infarction. Few studies have examined the relation between reperfusion time and heart failure (HF) events.We studied 7597 patients undergoing primary percutaneous coronary intervention from 2007 to 2013 in the Singapore Myocardial Infarct Registry, which captures HF at admission, postadmission in-hospital HF, and HF rehospitalization. We studied the relation of first medical contact to deployment of first device to achieve reperfusion (FTD) time with in-hospital HF events and HF rehospitalization, with mortality modeled as a competing risk. At the population level, median FTD time decreased from 91 minutes (interquartile range, 69–114) in 2007 to 58 minutes (45–75) in 2013 (P=0.001), whereas mortality remained unchanged (in-hospital: range 5.3%–7.3%; P=0.190 and 1-year: range 7.8%–10.9%; P=0.505). HF at admission increased from 12.2% in 2007 to 18.4% in 2013, P=0.020, whereas postadmission in-hospital HF decreased from 12.8% in 2007 to 7.1% in 2013, P=0.030. HF rehospitalization increased from 1.2% in 2007 to 2.6% in 2013 (P=0.003), for 30-day HF rehospitalization, and 3.8% in 2007 to 5.6% in 2013 (P=0.037), for 1-year HF rehospitalization. At the individual level, among patients with HF at admission (N=1191), longer FTD time was associated with more 30-day HF rehospitalization (compared with ≤60 minutes, adjusted hazard ratio, 1.68 [0.73–3.86] for 60–90 minutes, 2.88 [1.19–6.92], for 90–120 minutes, and 2.84 [1.08–7.44] for >120 minutes). Longer FTD time was associated with a greater risk of postadmission in-hospital HF (compared with ≤60 minutes, adjusted hazard ratio, 1.18 [0.96–1.44] for 60–90 minutes, 1.59 [1.25–2.03] for 90–120 minutes, and 1.67 [1.26–2.21] for >120 minutes).Temporal reductions in FTD time were associated with decrease in postadmission in-hospital HF. Among patients presenting with HF at admission, delays in FTD beyond 90 minutes were associated with more 30-day HF rehospitalization.