Performance and user evaluation of a novel capacitance-based automatic urinometer compared with a manual standard urinometer after elective cardiac surgery

Table 2 Clinical variables of the patients in the automatic urinometer group and the manual urinometer group^a

Variable	AU (n = 18)	MU (n = 16)	P -value
Female sex, %	28	50	0.29
Age, yr	68.0 (64.3 to 75.5)	66.5 (63.5 to 73.5)	0.75
Weight, kg	79.2 ± 15.3	80.3 ± 7.9	0.83
Height, cm	174 ± 5.8	172 ± 9.8	0.48
BMI, kg/m²	1.9 ± 0.2	2.0 ± 0.2	0.74
EuroSCORE II, %	1.7 (0.9 to 2.6)	1.6 (0.9 to 3.1)	0.85
Preoperative albumin, g/L	39.0 (36.0 to 40.3)	38.0 (36.0 to 39.8)	0.60
Preoperative creatinine, μmol/L	82.5 (67.8 to 97.8)	86.5 (62.5 to 100)	0.83
Preoperative eGFR, ml/min	78.0 (62.4 to 104)	75.4 (67.8 to 89.4)	0.91
IDDM, %	6	6	1.00
COPD, %	6	6	1.00
LVEF <50%, %	33	31	1.00
Surgical procedures
CABG, %	28	25	1.00
Single-valve replacement, %	44	44	1.00
Valve + CABG, %	11	19	0.65
Others, %	17	13	1.00
ECC, min	84.5 (71.5 to 133)	79.5 (67.0 to 127)	0.56
ICU stay, hr	22.5 (18.8 to 25.0)	23.0 (18.5 to 25.3)	0.77
Ventilation time in ICU, hr	3.0 (1.0 to 4.3)	2.5 (1.0 to 4.8)	0.96
Inotropes in ICU, %	0	6	0.47

^aAU, Automatic urinometer; BMI, Body mass index; CABG, Coronary artery bypass graft; COPD, Chronic obstructive pulmonary disease; ECC, Extracorporeal circulation; eGFR, Estimated glomerular filtration rate (Cockcroft-Gault equation); EuroSCORE, European System for Cardiac Operative Risk Evaluation [8]; ICU, Intensive care unit; IDDM, Insulin-dependent diabetes mellitus; LVEF, Left ventricular ejection fraction; MU, Manual urinometer. Data are presented as percentages, medians (25th to 75th percentile range) or means ± standard deviation.

ISSN: 1364-8535