TABLE 2.
Case control dataa
| Variable | S. schleiferi-infected patients | Uninfected patients | P | S. aureus-infected patients | P |
|---|---|---|---|---|---|
| No. of patients | 6 | 24 | 15 | ||
| Preoperative variables | |||||
| No. (%) of males | 6 (100.0) | 20 (83.3) | 0.56 | 12 (80.0) | 0.53 |
| Mean age (SD) | 63.3 (6.9) | 60.5 (11.4) | 0.45 | 63.6 (12.3) | 0.96 |
| Mean NYHA score (SD) | 3.0 (1.1) | 2.8 (1.3) | 0.70 | 3.1 (0.9) | 0.89 |
| Mean body mass index (SD) | 24.8 (2.3) | 26.6 (3.1) | 0.15 | 26.5 (3.4) | 0.20 |
| No. of diabetes mellitus patients | 0 | 4 | 0.88 | 2 | 1.00 |
| No. of patients taking immunosuppressive drugs | 0 | 1 | 1.00 | 1 | 1.00 |
| Perioperative variables | |||||
| Mean duration of surgery (min) (SD) | 217.2 (52.5) | 219.9 (56.9) | 0.91 | 243 (98.9) | 0.44 |
| Mean duration of extracorporeal circulation (min) (SD) | 112.0 (28.2) | 113.1 (47.1) | 0.94 | 135.7 (68.1) | 0.29 |
| Mean amount of blood transfused (ml) (SD) | 66.7 (163.3) | 268.2 (464.4) | 0.10 | 270.1 (139.2) | 0.20 |
| Mean blood loss (ml) (SD) | 550.0 (63.2) | 569.1 (84.6) | 0.56 | 743.5 (513.0) | 0.17 |
| Mean no. of bypasses (SD) | 3.7 (1.5) | 2.7 (1.8) | 0.21 | 3.7 (1.6) | 1.00 |
| No. (%) of procedures with surgeon A | 3 (50.0) | 4 (16.6) | 0.12 | 2 (13.3) | 0.115 |
| No. (%) of procedures with anesthetist A | 4 (66.6) | 4 (16.6) | 0.029 | 1 (6.6) | 0.011 |
| No. (%) of procedures with OR nurse Ab | 3 (50.0) | 1 (4.2) | 0.018 | 1 (6.6) | 0.053 |
| Postoperative variables | |||||
| Mean highest value of C-reactive protein (SD) | 125.8 (61.2) | 68.1 (54.0) | 0.07 | 182.2 (122.8) | 0.18 |
| Median length of stay (days) | 27 | 11 | 0.003 | 26 | 0.98 |
a
P values represent comparisons between S. schleiferi-infected patients and uninfected patients and between S. schleiferi-infected patients and S. aureus-infected patients.
b
OR, operating room.