Table 1:
Characteristics of 939 patients presenting with chest pain and no ST-segment elevation who underwent early measurement of cardiac troponin levels with a conventional troponin I assay and a high-sensitivity troponin T assay
| Characteristic | Assay result; no. (%) of patients* | |||
|---|---|---|---|---|
| All patients n = 939 |
Troponin I positive n = 246 |
Troponin I negative/high-sensitivity troponin T positive n = 111 |
Troponin I negative/high-sensitivity troponin T negative n = 582 |
|
| Age, yr, median (IQR) | 65 (56–76) | 71 (60–79) | 77 (69–83) | 61 (53–72) |
| Sex, male | 561 (59.7) | 168 (68.3) | 72 (64.9) | 321 (55.2) |
| Ethnic background | ||||
| NZ European† | 743 (79.1) | 195 (79.3) | 99 (89.2) | 449 (77.1) |
| Other European | 92 (9.8) | 24 (9.8) | 8 (7.2) | 60 (10.3) |
| Maori/Pacific Islander | 36 (3.8) | 12 (4.9) | 2 (1.8) | 22 (3.8) |
| Other | 68 (7.2) | 15 (6.1) | 2 (1.8) | 51 (8.8) |
| History of ischemic heart disease | 486 (51.8) | 125 (50.8) | 86 (77.5) | 275 (47.3) |
| Prior revascularization | 284 (30.2) | 75 (30.5) | 46 (41.4) | 163 (28.0) |
| Current smoker | 569 (60.6) | 146 (59.3) | 74 (66.7) | 349 (60.0) |
| Hypertension | 571 (60.8) | 162 (65.9) | 79 (71.2) | 330 (56.7) |
| Diabetes mellitus | 155 (16.5) | 54 (22.0) | 24 (21.6) | 77 (13.2) |
| Dyslipidemia | 541 (57.6) | 141 (57.3) | 68 (61.3) | 332 (57.0) |
| Peripheral vascular disease | 48 (5.1) | 12 (4.9) | 15 (13.5) | 21 (3.6) |
| Family history of ischemic heart disease | 564 (60.1) | 145 (58.9) | 59 (53.2) | 360 (61.9) |
| Body mass index, median (IQR) | 28 (25–31) | 27 (24–31) | 27 (24–30) | 28 (25–31) |
| Creatinine level, mmol/L, median (IQR) | 97 (88–115) | 97 (80–115) | 97 (80–124) | 80 (71–97) |
| Time to presentation, h, median (IQR) | 6.3 (3.3–13.3) | 6.1 (3.3–14.9) | 5.9 (3.5–10.0) | 6.4 (3.3–13.4) |
| Ischemic changes on ECG | 234 (24.9) | 127 (51.6) | 21 (18.9) | 86 (14.8) |
| In-patient revascularization | 163 (17.4) | 113 (45.9) | 3 (2.7) | 47 (8.1) |
Note: ECG = electrocardiogram, IQR = interquartile range, NZ = New Zealand.
*
Unless stated otherwise.
†
Patients self-identified as New Zealanders of European descent.