Table I.
Characteristics of the patients at baseline.
| Overall | PABD+PCS | PCS | |
|---|---|---|---|
| N. of patients (%) | 461 (100) | 182 (39.5) | 279 (60.5) |
| Age (years) | 66.9±10.7 | 62.5±9.4*** | 69.7±10.5*** |
| Male sex (%) | 38.6 | 37.7 | 39.4 |
| Basal Hb (g/dL) | 14.2±1.1 | 14.5±1.0*** | 14.0±1.1*** |
| N. of days in hospital | 3.9±2.4 | 4.1±2.8 | 3.7±2.1 |
| Blood loss in TKA (mL) | 511±240£££ | 491±224 | 523±249£££ |
| Blood loss in THA (mL) | 436±184£££ | 442±205 | 431±167£££ |
| Decrease in Hb concentration after TKA (g/dL) | −2.2±0.9§§§ | −2.9±0.9*** | −1.8±0.8***;§§§ |
| Decrease in Hb concentration after THA (g/dL) | −2.6±1.0§§§ | −3.1±0.9*** | −2.2±0.9***;§§§ |
|
| |||
| Co-morbidities | |||
| Hypertension - n. (%) | 255 (55.3) | 89 (48.9)* | 166 (59.5)* |
| Diabetes - n. (%) | 36 (7.8) | 8 (4.4)* | 28(10.0)* |
| Coronary artery disease - n. (%) | 45 (9.8) | 1 (0.0)*** | 44 (15.8)*** |
| Kidney disease - n. (%) | 35 (7.6) | 11 (6.0) | 24 (8.6) |
|
| |||
| ASA Class | |||
| I - n. (%) | 84 (18.2) | 61 (33.5)*** | 23 (8.2)*** |
| II - n. (%) | 377 (81.8) | 121 (66.5)*** | 256 (91.8)*** |
|
| |||
| Procedure | |||
| Unilateral TKA - n. | 218 | 82 | 136 |
| Unilateral THA - n. | 243 | 100 | 143 |
Legend
***
P <0.001, between PABD+PCS and PCS only patients (same row);
§§§ and £££
p <0.001 between TKA and THA (same column).
Plus-minus values are means ± SD. PABD: pre-operative blood donation; PCS: post-operative cell salvage; TKA: total knee arthroplasty; THA: total hip arthroplasty; ASA: American Society of Anesthesiologists; Hb: haemoglobin.