Table 1.
Characteristics of 2,094 patients with acute myocardial infarction presenting with and without documented ischaemic symptoms.
| Variable | Documented ischaemic Symptoms | ||
|---|---|---|---|
| No (N=217) | Yes (N=1,877) | P value | |
| PATIENT CHARACTERISTICS | |||
| Demographic Data | |||
| Mean age (s.d.) yrs | 63 (14) | 62 (14) | 0.060 |
| Female gender, No. (%) | 95 (44) | 658 (35) | 0.011 |
| Race, No. (%) | |||
| White | 77 (36) | 1,144 (62) | <0.001 |
| Black | 132 (61) | 604 (33) | |
| Hispanic | 3 (1) | 65 (4) | |
| Other | 4 (2) | 44 (2) | |
| Medical History, No. (%) | |||
| Myocardial infarction | 47 (22) | 513 (27) | 0.074 |
| Heart failure | 72 (33) | 276 (15) | <0.001 |
| Diabetes | 102 (47) | 600 (32) | <0.001 |
| Renal insufficiency | 75 (35) | 235 (13) | <0.001 |
| Angina | 19 (9) | 384 (21) | <0.001 |
| Coronary stenosis >50% | 24 (11) | 307 (16) | 0.043 |
| Prior Percutaneous Coronary Intervention | 33 (15) | 349 (19) | 0.221 |
| Coronary bypass | 30 (14) | 258 (14) | 0.974 |
| Prior Stroke | 32 (15) | 148 (8) | <0.001 |
| Gastro-oesophageal reflux disease | 23 (11) | 283 (15) | 0.077 |
| Hypercholesterolemia | 87 (40) | 909 (48) | 0.020 |
| Hypertension | 174 (80) | 1,265 (67) | <0.001 |
| Chronic lung disease | 40 (18) | 247 (13) | 0.032 |
| Alcohol abuse | 54 (25) | 252 (13) | <0.001 |
| Cancer | 30 (14) | 181 (10) | 0.053 |
| Presentation | |||
| ST Elevation Myocardial Infarction (%) | 27 (12) | 662 (35) | <0.001 |
| Initial systolic Blood Pressure (mm Hg), mean (s.d.) | 140 (46) | 139 (39) | 0.659 |
| Initial diastolic Blood Pressure (mm Hg), mean (s.d.) | 78 (23) | 79 (19) | 0.500 |
| Initial Heart rate, mean (s.d.) | 93 (29) | 81 (26) | <0.001 |
| Maximum troponin (ng/dL), median (interquartile range) | 11 (0.3–7.1) | 54 (1.3–28) | <0.001 |
| Initial creatinine (mg/dL), mean (s.d.) | 2.9 (3.7) | 1.5 (1.8) | <0.001 |
| Killip Class IV | 11 (6) | 10 (0.6) | <0.001 |