Table 1. Characteristics of all included patients.
| Postoperative anaemia n = 90 |
No postoperative anaemia n = 93 |
p-value | ||||
|---|---|---|---|---|---|---|
| Demographics | ||||||
| Age [years] | 68.5 | ±14.9 | 66.1 | ±13 | 0.260 | |
| Female Gender | 39 | 43.3% | 47 | 50.5% | 0.329 | |
| BMI [kg/m2] | 27.5 | ±5.9 | 27.5 | ±6.9 | 0.995 | |
| Smoker | 15 | 16.7% | 23 | 24.7% | 0.179 | |
| Daily consume of alcohol | 7 | 8.3% | 14 | 18.2% | 0.064 | |
| Atrial fibrillation | 18 | 20.0% | 10 | 10.8% | 0.082 | |
| ASA | 3 | [1] | 3 | [1] | 0.097 | |
| NYHA | 0 | [2] | 0 | [0] | < | 0.001* |
| Intraoperative parameters | ||||||
| Surgical Risk | 3 | [2] | 2 | [1] | 0.001* | |
| Hypotension before anaesthesia | 0 | 0% | 0 | 0% | - | |
| Heart rate before anaesthesia [bpm] | 70 | [18] | 74 | [14] | 0.85 | |
| Crystalloid infusion in [ml] | 2035.3 | ±1317.0 | 1984 | ±1566 | 0.820 | |
| Colloid infusion [ml] | 198.1 | ±512.7 | 178 | ±444 | 0.658 | |
| Transfusion of packed red cells | 14 | 16.5% | 6 | 6.7% | 0.042* | |
| Transfusion of fresh-frozen-plasma | 10 | 11.8% | 6 | 6.7% | 0.242 | |
| Transfusion of thrombocyte concentrate | 7 | 8.2% | 3 | 3.2% | 0.163 | |
| Duration of anaesthesia [min] | 217.9 | ±92.8 | 165.3 | ±82.7 | < | 0.001* |
| Duration of surgery [min] | 140.1 | ±80.6 | 101.2 | ±68.9 | 0.001* | |
| Postoperative parameters | ||||||
| POD | 28 | 38.4% | 10 | 10.9% | < | 0.001* |
| PONV | 17 | 18.9% | 14 | 15.1% | 0.489 | |
| Hypotension on admission in RR/PACU | 4 | 4.4% | 0 | (0%) | 0.58 | |
| Heart rate on admission in RR/PACU [bpm] | 85 | [20] | 80 | [20] | 0.14 | |
| RASS on admission in RR/PACU | -1 | [3] | 0 | [1] | < | 0.001* |
| GCS on admission in RR/PACU | 15 | [1] | 15 | [0] | 0.001* | |
| Duration of hospital admission [days] | 12.4 | ±8.7 | 7.8 | ±4.4 | < | 0.001* |
Study Group; No of Patients (%), median [IQR] or mean (± SD); IQR = interquartile range; BMI = body mass index; ml = millilitre; surgical risk measured by POSSUM; min = minutes; POD = postoperative delirium; PONV = postoperative nausea and vomiting; bpm = beats per minute; RR = recovery room; PACU = post-anaesthesia care unit; RASS = Richmond Agitation Scale; GCS = Glasgow Coma Scale; mv = missing values;
*p < 0.05.