TABLE 2.
Post‐operative characteristics of the study sample for procedures performed between 2011 and 2018 for transfusion threshold analyses and between 2013 and 2018 for the blood transfusion analysis.
| Post‐operative characteristics | THA (n = 4917) | TKA (n = 2363) | UKA (n = 2735) | Total (n = 10 015) | ||||
|---|---|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | Mean | SD | Mean | SD | |
| Post‐operative Hb (g/L) | 107.53 | 15.3 | 109.78 | 14.1 | 121.13 | 13.19 | 110.89 | 15.51 |
| Missing (n, %) | 100 (2.03) | 117 (4.95) | 908 (33.2) | 1125 (11.23) | ||||
| Change in Hb (g/L) | 27.52 | 11.25 | 24.74 | 10.47 | 17.16 | 8.03 | 24.71 | 11.21 |
| Missing (n, %) | 124 (2.52) | 157 (6.64) | 947 (34.63) | 1228 (12.26) | ||||
| n | % | n | % | n | % | n | % | |
| Post‐operative anaemia (WHO) | ||||||||
| No | 598 | 12.16 | 329 | 13.92 | 727 | 26.58 | 1654 | 16.52 |
| Yes | 4219 | 85.8 | 1917 | 81.13 | 1100 | 40.22 | 7236 | 72.25 |
| Missing | 100 | 2.03 | 117 | 4.95 | 908 | 33.2 | 1125 | 11.23 |
| Post‐operative anaemia (ICS) | ||||||||
| No | 348 | 7.08 | 161 | 6.81 | 448 | 16.38 | 957 | 9.56 |
| Yes | 4469 | 90.89 | 2085 | 88.24 | 1379 | 50.42 | 7933 | 79.21 |
| Missing | 100 | 2.03 | 117 | 4.95 | 908 | 33.2 | 1125 | 11.23 |
| Post‐operative blood transfusion a | ||||||||
| No | 3946 | 92.89 | 1955 | 95.93 | 2419 | 99.88 | 8320 | 95.54 |
| Yes | 302 | 7.11 | 83 | 4.07 | 3 | 0.12 | 388 | 4.46 |
| Post‐operative blood transfusion given on same day of surgery b | ||||||||
| No | 224 | 74.17 | 72 | 86.75 | 3 | 100 | 299 | 77.06 |
| Yes | 78 | 25.83 | 11 | 13.25 | 0 | 0 | 89 | 22.94 |
| Post‐operative Hb below transfusion trigger (70 g/L) | ||||||||
| No | 4794 | 97.5 | 2244 | 94.96 | 1827 | 66.8 | 8865 | 88.52 |
| Yes | 23 | 0.47 | 2 | 0.08 | ‐ | ‐ | 25 | 0.25 |
| Missing | 100 | 2.03 | 117 | 4.95 | 908 | 33.2 | 1125 | 11.23 |
| Post‐operative Hb below transfusion trigger (80 g/L) | ||||||||
| No | 4678 | 95.14 | 2216 | 93.78 | 1826 | 66.76 | 8720 | 87.07 |
| Yes | 139 | 2.83 | 30 | 1.27 | 1 | 0.04 | 170 | 1.70 |
| Missing | 100 | 2.03 | 117 | 4.95 | 908 | 33.2 | 1125 | 11.23 |
Note: Results are presented by procedure.
Abbreviations: THA, total hip arthroplasty; TKA, total knee arthroplasty; UKA, unicompartmental (partial) knee arthroplasty; Hb, haemoglobin; ASA, American Society of Anesthesiologists; WHO, World Health Organisation; ICS, International Consensus Statement.
a
Blood transfusion based on data from 2013 to 2018, n = 8708.
b
Patients who had a blood transfusion based on data from 2013 to 2018.