Table 3.

Respiratory microbiology

	Positive culture at enrollment		P value	New positive culture following enrollment		P value
	Placebo N = 25	Heparin N = 25		Placebo N = 25	Heparin N = 25
Respiratory cultures, number (percentage)
Pathogen detected	11 (44)	5 (20)	0.07	12 (48)	9 (36)	0.4
Gram-positive	4 (16)	1 (4)	0.4	1 (4)	2 (8)	0.5
Gram-negative	5 (20)	1 (4)	0.2	6 (24)	5 (20)	0.7
Yeast/fungus	3 (12)	1 (4)	0.6	7 (28)	3 (7)	0.2
Legionella pneumonia	1 (4)	0	1	0	0
H1N1 polymerase chain reaction	1 (4)	2 (8)	1	0	0

Pulmonary lavage was undertaken at enrollment and on study days 1, 2, 4, 8, and 14 if the patient remained ventilated and sedated.