From: Symptom onset to balloon time in patients with ST-segment elevation myocardial infarction treated by primary coronary angioplasty: influence on ST-segment resolution and on mortality
Symptom to balloon time
<2 hours
2–4 hours
4–6 hours
>6 hours
P value
ST-segment resolution (%)
95
92
86
78
0.0001
Procedural success (%)
97
91
84
0.03
Mortality (%)
6
9
12
29
<0.001