Preoperative White Blood Cell Count and Risk of 30-Day Readmission after Cardiac Surgery

Table 2

Procedural characteristics and outcomes of patients with or without 30-day readmission.

Characteristic	30-day readmission
	No	Yes	𝑃 value
Procedural characteristics
Priority
Emergent	5.3	6.6	0.534
Urgent	50.9	47.9
Elective	43.9	45.6
Procedure
CABG	60.7	51.0	0.007
Valve	22.4	30.1
CABG/valve	17.0	18.9
On-pump surgery	90.3	95.8	0.004
Nadir hematocrit <20 on bypass	15.0	20.5	0.029
Cardiopulmonary bypass time (min)	119.7±53.7	122.9±56.5	0.393
Time to initial extubation (min)	17.3±65.2	17.6±35.1	0.951
Intraoperative myocardial infarction	2.4	2.7	0.725
Return to bypass	4.2	4.6	0.730
Management
RBC transfusions
None	67.6	58.7	0.001
One	8.9	10.0
Two	10.3	9.3
Three or more	13.2	22.0
Use of 1 or more inotropes
Arrive to ICU	43.9	44.0	0.965
After 4 hours	37.2	44.0	0.034
After 48 hours	11.3	15.1	0.080
Adverse outcomes
Low-cardiac output failure	8.0	10.0	0.272
Stroke	1.1	1.5	0.525
Mediastinitis	0.4	2.7	<0.001
Acute kidney injury	30.7	49.4	<0.001
Reintubation	3.7	3.9	0.866
Return to operating room for bleeding	3.2	4.3	0.395
New atrial fibrillation	32.6	39.8	0.021
Leg wound infection	0.7	1.2	0.463
Pneumonia	1.7	0.8	0.275

CABG: coronary artery bypass graft surgery; RBC: packed red blood cell transfusion; ICU: intensive care unit.