Skip to main content
. Author manuscript; available in PMC: 2010 Nov 1.
Published in final edited form as: Am J Cardiol. 2009 Nov 1;104(9):1198–1203. doi: 10.1016/j.amjcard.2009.06.034

Table 2.

Patient characteristics and door-to-balloon time

Hours
Characteristic Overall <1 1–2 2–3 3–4 4+ P P trend
n=1932 n=111 n=758 n=599 n=224 n=240 - -
Demographics
Median age (IQR) 73 (69–78) 72 (69–78) 72 (69–78) 73 (69–78) 74 (70–78) 74 (70–78) 0.010 -
Women 44.7 36.9 42.2 46.7 49.6 46.7 0.088 0.020
White race 92.3 94.6 95.0 91.2 88.4 89.2 0.002 <0.001
Smoker 20.2 14.4 21.6 22.5 15.2 17.1 0.037 0.22
Cerebrovascular disease 10.4 9 7.9 12.5 10.7 13.3 0.035 0.013
Prior coronary bypass 8.9 7.2 7 9.2 12.5 11.7 0.046 0.005
Prior percutaneous coronary intervention 12.2 20.7 10.3 13.2 9.8 14.2 0.013 0.99
Hypertension 58.6 50.4 55 60.9 58.9 67.5 0.003 <0.001
Diabetes mellitus 22.9 25.2 18.9 21.9 26.8 33.8 <0.001 <0.001
Prior myocardial infarction 19.2 17.1 15.4 21.9 21.4 23.3 0.010 0.003
Congestive heart failure 6.7 4.5 5.9 6.7 6.7 10.4 0.15 0.019
Chronic obstructive pulmonary disease 15.9 12.6 15.6 16.4 16.1 17.5 0.83 0.32
Presentation
Symptoms <6 hours 73.2 79.3 81.3 73.3 67.9 50.0 <0.001 <0.001
No chest pain 3.7 1.8 2.2 4.0 3.1 9.2 <0.001 <0.001
Median sytolic blood pressure (IQR) 136 (115–159) 132 (113–150) 135 (114–160) 136 (113–156) 140 (120–162) 140 (120–160) 0.045 -
Median heart rate (IQR) 76 (63–89) 76 (63–89) 75 (60–88) 75 (62–89) 79 (66–93) 80 (67–92) <0.001 -
Shock 7.1 9.0 6.1 7.7 5.8 9.6 0.30 0.31
Cardiac arrest 5.3 3.6 4.5 6.7 4.9 5.4 0.41 0.38
Electrocadiographic findings
Anterior myocardial infarction 56.5 55.9 54.9 59.6 54 56.7 0.45 0.71
Left bundle branch block on admission 4.8 1.8 2.1 4.2 9.5 11.7 <0.001 <0.001
Median sum ST elevation 7.5 (5.0–12.0) 9.0 (5.0–13.0) 8.0 (5.5–13.0) 7.0 (4.5–12.0) 6.5 (4.0–11.0) 6.5 (4.0–10.0) <0.001 -
Q wave myocardial infarction 88.6 89.2 90.8 88.2 87.5 83.8 0.049 0.005
Hospital characteristics
Median myocardial infarction volume (IQR) 202 (136–340) 192 (148–340) 203 (142–325) 214 (136–346) 188 (129–364) 202 (132–326) 0.81 -
On-site surgical back-up 89.2 91.9 88.3 89.6 89.7 89.6 0.78 0.78
Ownership 0.40 -
 Public 10.3 9.1 11.2 8.9 13.1 8.8
 Not-for-profit 77.8 76.4 77.9 79.4 72.1 79.5
 For-profit 11.9 14.6 10.8 11.7 14.9 11.7
Teaching status 0.18 -
 Non-teaching 47.1 52.2 45.1 46.7 51.3 47.9
 Teaching 35.9 31.5 39.4 35.9 29.9 32.1
 Council of Teaching Hospitals 17 16.2 15.4 17.4 18.8 20
Rural hospital 5.5 6.4 5.5 6.7 4.5 3.4 0.36 0.20