Table 2.
Baseline characteristics and outcomes of MPI by pathogen type
| Variable | Any S aureus (n = 87) | Any gram-negative bacteria (no S aureus infection) (n = 83) | CoNS only (n = 92) | Other pathogens (n = 79) | P value |
|---|---|---|---|---|---|
| Risk factors, n (%) | |||||
| BMI, kg/m2* | |||||
| ≥30 and <40 | 32 (36.8) | 32 (38.6) | 35 (38.0) | 21 (26.6) | <.0001 |
| ≥40 | 8 (9.2) | 5 (6.0) | 12 (13.0) | 7 (8.9) | |
| Emergent procedure | 3 (3.5) | 5 (6.0) | 7 (7.6) | 0 (0.0) | .0002 |
| Diabetes | 42 (48.3) | 35 (42.2) | 44 (47.8) | 33 (41.8) | .0008 |
| Renal failure | 13 (14.9) | 19 (22.9) | 14 (15.2) | 8 (10.1) | <.0001 |
| Cerebrovascular accident | 12 (13.9) | 14 (16.9) | 13 (14.1) | 10 (12.7) | .0007 |
| Peripheral vascular disease | 20 (23.0) | 25 (30.1) | 24 (26.1) | 19 (24.1) | <.0001 |
| Immunosuppressive treatment | 2 (2.3) | 10 (12.1) | 5 (5.4) | 5 (6.3) | <.0001 |
| Previous CABG | 9 (10.3) | 16 (19.3) | 12 (13.0) | 4 (5.1) | .0001 |
| Myocardial infarction | 47 (54.0) | 50 (60.2) | 50 (54.4) | 41 (51.9) | <.0001 |
| Congestive heart failure | 21 (24.1) | 30 (36.1) | 31 (33.7) | 26 (32.9) | <.0001 |
| NYHA class IV | 28 (32.2) | 34 (41.0) | 31 (33.7) | 28 (35.4) | .0040 |
| 30-day infection type (infected patients), n (%) | |||||
| SSI only | 36 (41.4) | 15 (18.1) | 43 (46.7) | 30 (38.0) | <.0001 |
| BSI only | 36 (41.4) | 59 (71.1) | 47 (51.1) | 44 (55.7) | |
| SSI and BSI | 15 (17.2) | 9 (10.8) | 2 (2.2) | 5 (6.3) | |
| Outcomes | |||||
| 30-day mortality, n (%) | 10 (11.5) | 10 (12.1) | 3 (3.3) | 6 (7.6) | <.0001 |
| Postoperative LOS, days, median | 11.0 | 22.0 | 14.0 | 13.0 | <.0001 |
CABG, coronary artery bypass graft surgery; NYHA, New York Heart Association.
*
Reference group was BMI <30 kg/m2.