Table 4.
Perioperative patient characteristics according to the RCRI score. Mean (95% CI) are shown, other than for age (median, inter-quartile range) with absolute numbers (% of total) shown for each procedure type. P-values refer to differences between RCRI groups (Fisher's exact test or anova, as appropriate). * and # denote differences between RCRI groups (post hoc Tukey's test)
| mRCRI score |
P-value | |||||
|---|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | ≥4 | ||
| Number | 192 | 175 | 81 | 58 | 54 | |
| Age (yr) | 62* (61–64) | 74 (73–76) | 71 (68–72) | 74 (71–77) | 75 (73–76) | <0.0001 |
| Male (%) | 35 | 38 | 45 | 38 | 45 | 0.59 |
| White cell count | 6.7 (6.4–7.1) | 7.6 (6.3–8.8) | 7.4 (6.9–8.0) | 7.7 (6.8–8.5) | 6.5 (5.8–7.3) | 0.46 |
| THR [n (%)] | 88 (37) | 73 (31) | 35 (15) | 21 (9) | 21 (8) | 0.77 |
| TKR [n (%)] | 92 (32) | 92 (32) | 41 (14) | 32 (11) | 28 (10) | |
| Revision | ||||||
| Total [n (THR):n (TKR)] | 12 (9:3) | 10 (6:4) | 5 (3:2) | 5 (3:2) | 5 (4:1) | 0.72 |
| % total operations | 6 | 6 | 6 | 9 | 9 | |
| Operative time (min) | 155 (148–162) | 143 (137–149) | 151 (139–163) | 158 (140–175) | 154 (134–174) | 0.19 |
| POSSUM | 15* (15–15) | 18 (17–18) | 17 (16–18) | 18 (17–19) | 20# (18–21) | |
| POSSUM-predicted morbidity (%) | 15.5 | 21.2 | 20.2 | 24 | 29.4 | <0.0001 |
| Elective ICU admissions (%) | 1 | 2 | 6 | 10* | 11* | 0.0003 |
| Postoperative temperature | 36.1 (36.0–36.2) | 36.1 (36.0–36.2) | 36.2 (36.0–36.3) | 36.3 (36.1–36.4) | 36.1 (35.9–36.3) | 0.4 |
| Preoperative haematocrit | 0.40 (0.39–0.41) | 0.40 (0.39–0.41) | 0.41 (0.40–0.42) | 0.39 (0.38–0.40) | 0.39 (0.37–0.42) | 0.35 |
| Postoperative haematocrit | 0.32 (0.31–0.32) | 0.31 (0.30–0.32) | 0.32 (0.30–0.33) | 0.30 (0.28–0.32) | 0.31 (0.29–0.34) | 0.53 |