Research Article
Preoperative White Blood Cell Count and Risk of 30-Day Readmission after Cardiac Surgery
Table 1
Characteristics of patients with or without 30-day readmission.
| Characteristic | 30-day readmission | No | Yes | value |
| Number of patients (2,176) | 1,917 | 259 | | Demographics | | | | Age | | | 0.740 | Female | 28.5 | 32.8 | 0.154 | BMI | | | 0.585 | Comorbidities | | | | Type 2 diabetes mellitus | 31.5 | 37.1 | 0.070 | Vascular disease | 27.3 | 30.9 | 0.224 | COPD | 15.6 | 20.5 | 0.043 | History of dialysis | 2.4 | 5.0 | 0.015 | Smoking | 21.4 | 22.4 | 0.726 | Cardiac history | | | | Recent MI | 17.3 | 13.1 | 0.091 | CHF | 19.9 | 25.1 | 0.051 | Prior CABG | 3.9 | 2.7 | 0.337 | Prior valve | 1.5 | 1.9 | 0.611 | Prior PCI | 18.2 | 17.4 | 0.760 | NYHA Class IV | 15.6 | 15.4 | 0.949 | Cardiac anatomy and function | | | | Left main disease ≥50% | 28.8 | 20.9 | 0.007 | Single-vessel disease | 33.5 | 42.6 | 0.002 | Two-vessel disease | 28.5 | 30.2 | | Three-vessel disease | 38.1 | 27.3 | | Ejection fraction | | | | <40% | 11.3 | 12.3 | 0.894 | 40%–59% | 12.6 | 11.1 | | 50%–59% | 24.3 | 24.2 | | ≥60% | 51.7 | 52.4 | | White blood cell count (in 1,000's, mm3) | | | | <6.0 | 19.9 | 19.7 | 0.037 | 6.0–7.9 | 39.2 | 35.9 | | 8.0–9.9 | 25.3 | 21.6 | | 10.0–12.0 | 9.9 | 13.1 | | >12.0 | 5.6 | 9.7 | |
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COPD: chronic obstructive pulmonary disease; MI: myocardial infarction; CHF: congestive heart failure; CABG: coronary artery bypass graft surgery; PCI: percutaneous coronary intervention; WBC: white blood cell; eGFR: estimated glomerular filtration rate.
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