Development of an Open-Heart Intraoperative Risk Scoring Model for Predicting a Prolonged Intensive Care Unit Stay

Table 1

Demographic and clinical data.

Characteristics	Nonprolonged ICU; (𝑛=102)	Prolonged ICU; (𝑛=66)	𝑃 value
Age (years)	54.5±11.2	60.5±12.3	0.002
Gender
Male	61 (59.8)	54 (81.8)	0.004
Female	41 (40.2)	12 (18.2)
Type of operation
CABG	49 (48.0)	36 (54.6)	0.433
Valve surgery	49 (48.0)	22 (33.3)	0.078
CABG + valve surgery	4 (4.0)	8 (12.1)	0.023
NYHA class
I-II	83 (81.4)	42 (63.6)	0.012
III-IV	19 (18.6)	24 (36.4)
Ejection fraction (%)	59.2±14.0	53.0±16.5	0.012
<40	12 (11.8)	16 (24.2)	0.055
≥40	90 (88.2)	50 (75.8)
Preoperative variables:
Hypertension	33 (32.4)	32 (48.5)	0.051
Diabetes mellitus	27 (26.5)	22 (33.3)	0.386
Myocardial infarction	16 (15.7)	15 (22.7)	0.309
Dyslipidemia	13 (12.8)	16 (24.2)	0.062
Atrial fibrillation	20 (19.6)	12 (18.1)	0.844
Congestive heart failure	7 (6.7)	11 (16.7)	0.071
Kidney impairment/disease	4 (3.9)	7 (10.6)	0.155
Creatinine value (mg/dL)	0.95±0.3	1.11±0.5	0.025
CPB time (minutes)	107.9±37.9	126.6±36.9	0.002
Aortic cross-clamping time (minutes)	78.1±29.8	89.4±27.2	0.014
Mechanical ventilation (hours)	10.9±7.5	31.8±41.5	<0.001
Endotracheal tube retaining (hours)	11.7±8.1	33.4±41.5	<0.001
ICU stay (hours)	25.7±9.3	88.8±51.6	<0.001
Hospital stay (days)	13.6±5.3	18.5±9.9	<0.001

NYHA: New York Heart Association; CABG: coronary artery bypass graft surgery; MVR: mitral valve replacement; MV: mitral valve; AVR: aortic valve replacement; TV: tricuspid valve; CPB: cardiopulmonary bypass; ICU: intensive care unit. Values are mean ± SD or 𝑛 (%).