Table 2 Information available in CPRD primary care data (coded data and free text) for a random sample of 2000 patients with myocardial infarction in the linked CALIBER dataset
Data element | Structured data only | Structured or free text | % increase by using free text | ||
|---|---|---|---|---|---|
Within 90 days before or after MI: | |||||
Pulse rate | 323 | (16.2%) | 634 | (31.7%) | 96% |
Blood pressure | 1557 | (77.9%) | 1609 | (80.5%) | 3% |
Left ventricular function result | 115 | (5.8%) | 309 | (15.5%) | 169% |
Coronary angiogram results | 26 | (1.3%) | 198 | (9.9%) | 662% |
Irregular pulse | 2 | (0.1%) | 6 | (0.3%) | 200% |
Atrial fibrillation or flutter | 121 | (6.0%) | 153 | (7.6%) | 26% |
Chest pain ≤7 days before MI | 378 | (18.9%) | 543 | (27.2%) | 44% |
Chest pain ≤90 days before MI | 455 | (22.8%) | 642 | (32.1%) | 41% |
Shortness of breath ≤7 days before MI | 62 | (3.1%) | 102 | (5.1%) | 65% |
Shortness of breath ≤90 days before MI | 125 | (6.3%) | 196 | (9.8%) | 57% |