Table 2.

Comparison of ICU survivors with and without prolonged mechanical ventilation for 7 days or longer

	Prolonged ventilatory support	NO prolonged ventilation
	N = 28	N = 23	P-value
Age, years	56.9 (50.2, 67.8)	59.4 (54.3, 75.0)	0.18
Male gender, n (%)	18 (64.3%)	15 (65.2%)	0.94
MICU, n (%)	18 (64.3%)	15 (65.2%)	0.94
Diabetes mellitus, n (%)	8 (28.6%)	11 (47.8%)	0.16
Hypertension, n (%)	12 (42.9%)	19 (82.6%)	0.004
IHD, n (%)	3 (10.7%)	10 (43.5%)	0.008
Chronic liver disease or liver cirrhosis, n (%)	1 (3.6%)	2 (8.7%)	0.58
APACHE II score	23 (20, 28)	23 (18, 25)	0.82
Time from hospital admission to ICU admission, days	1 (0, 3)	1 (0, 10)	0.80
Premorbid serum creatinine, µmol/L	87 (65, 97)	108 (70, 154)	0.12
AKI cause: sepsis, n (%)	21 (87.5%)	17 (89.5%)	1.00
Oliguria, n (%)	21 (75.0%)	14 (77.8%)	1.00
Mechanical ventilation at ICU admission, n (%)	27 (96.4%)	18 (94.7%)	1.00
Vasopressor at ICU admission, n (%)	23 (82.1%)	12 (63.2%)	0.18
Serum creatinine at RRT initiation, µmol/L	256 (164, 354)	311 (184, 539)	0.28
Serum calcium at RRT initiation, mmol/L	1.76 (1.62, 1.89)	1.85 (1.9, 1.98)	0.29
Serum phosphate at RRT initiation, mmol/L	1.30 (0.96, 2.09)	1.76 (1.63, 2.74)	0.03
Serum albumin at RRT initiation, g/L	23 (16, 24)	23 (17, 28)	0.14
Initial modality: CRRT, n (%)	22 (78.6%)	16 (69.6%)	0.46
Effluent flow rate in CRRT, mL/kg/h	34.4 (28.1, 40.0)	33.0 (26.8, 37.3)	0.51
CRRT duration, days	1 (0, 4)	3 (0, 5)	0.17
Intermittent dialysis sessions, n (%)	2 (0, 6)	1 (0, 4)	0.45
Total dialysis duration, days	7 (4, 11)	5 (4, 8)	0.13
Hypophosphatemia during dialysis, n (%)	14 (50.0%)	2 (8.7%)	0.002

Categorical variables are expressed as number (percentage) and compared using chi-square or Fisher’s exact test as appropriate. Continuous variables are expressed as median (IQR) and compared using Mann–Whitney U-test. MICU, medical intensive care unit.