Table 1 Descriptive statistics of preoperative and intraoperative variables analyzed in the whole sample (3315 patients)
From: A simple clinical model for planning transfusion quantities in heart surgery
Variables | Frequency count and percentage |
|---|---|
Sex (female) | 1093 (33.0%) |
Age > 70 years | 1549 (46.7%) |
Body surface area > 1.8 m2 | 1329 (40.1%) |
Surgical procedure different from isolated coronary artery bypass graft | 1559 (47.0%) |
Previous cardiovascular surgery | 147 (4.4%) |
Emergency | 67 (2.0%) |
Non-routine procedure (urgency) | 287 (8.7%) |
Preoperative dialysis | 21 (0.6%) |
Systemic arterial hypertension | 2227 (67.2%) |
Diabetes requiring medical treatment | 780 (23.5%) |
Unstable angina | 695 (21.0%) |
Active endocarditis | 16 (0.5%) |
Recent myocardial infarction (< 7 days) | 98 (3.0%) |
Cardiogenic shock | 32 (1.0%) |
Chronic obstructive pulmonary disease | 228 (6.9%) |
Previous cerebrovascular events | 165 (5.0%) |
Admission hematocrit ≤ 40% | 1973 (59.5%) |
Antiplatelet therapy | 1469 (44.3%) |
Dicoumarole therapy | 136 (4.1%) |
Heparin therapy | 1225 (37.0%) |
Intraortic balloon pump insertion | 83 (2.5%) |
Serum creatinine > 1.2 mg/dl | 599 (18.1%) |
Cardiopulmonary bypass time > 130 minutes | 1351 (40.8%) |
Aortic clamping time > 90 minutes | 1445 (43.6%) |
Minimum hematocrit during cardiopulmonary bypass ≤ 20% | 533 (16.1%) |
Minimum temperature ≤ 32 °C | 1639 (49.4%) |