Table 1:

Baseline Characteristics

Characteristics		Not dialyzed within 24 hours of loop diuretic challenge (N=525)	Dialyzed within 24 hours of loop diuretic challenge (N=162)	p value
Age		67.6 ± 15.6	63.9 ± 14.5	.008
Sex (Male) (%)		49.1	56.2	.1
Charlson’s Score		5.8±2.7	4.9±2.4	<.001
SOFA score*		8.3±3.4	10.4±3.9	<.001
Highest serum potassium*(meq/L)		4.5±0.8	4.8±0.9	<.001
Lowest serum bicarbonate* (mmol/L)		19.3±4.9	18.4±4.8	.06
Baseline average urine output (ml)		20.7 (7.5–46.3)	10.1(3.9–18.8)	<.001
Baseline serum albumin (mg/dL)		2.9±0.6	2.9±0.6	.8
Baseline serum creatinine (mg/dL)		1.0 (0.8–1.3)	0.9 (0.7–1.2)	.05
Baseline estimated glomerular filtration rate (ml/min)		59 (47–94)	69(50–99)	.04
Serum creatinine* (mg/dL)		3.5 (2.5–4.5)	4.1 (3.0–5.3)	<.001
Blood Urea Nitrogen* (mg/dL)		59 (41–78)	63 (45–84)	.04
Serum pH*		7.35±0.08	7.32±0.11	.007
Race	Caucasian	87.8	88.8	.9
	African American	1.9	2.5
	Asian	1.1	1.2
	Others	3.1	1.9
	Unknown	6.1	5.6
Mechanical Ventilation Use		52.2	52.3	.1

^*On the day of the loop diuretic challenge