Adding vortexing to the Maki technique provides no benefit for the diagnosis of catheter colonization or catheter-related bacteremia

Table 1 Characteristics of central venous catheter with suspicion of catheter-related infection that developed or not catheter-related bloodstream infection

Data	Non CRBSI (n = 126)	CRBSI (n = 10)	P value (CRBSI vs non)
Time of CVC (d) [median (p 25-75)]	9 (7-12)	12 (10-18)	0.02
Site of CVC, n (%)			0.19
Subclavian	28 (22.2)	3 (30.0)
Jugular	62 (49.2)	2 (50.0)
Femoral	36 (28.6)	5 (50.0)
Age (yr, p 25-75)	65 (57-70)	65 (58-75)	0.50
Sex female, n (%)	30 (23.8)	1 (10.0)	0.45
Admission diagnostic, n (%)			0.74
Medical	73 (57.9)	7 (70.0)
Surgical	39 (31.0)	2 (20.0)
Traumatology	14 (11.1)	1 (10.0)
Diabetes mellitus, n (%)	39 (31.0)	3 (30.0)	0.99
COPD, n (%)	16 (12.7)	0	0.61
Asthma, n (%)	3 (2.4)	0	0.99
Chronic liver disease, n (%)	25 (19.8)	0	0.21
Smoking, n (%)	36 (28.6)	4 (40.0)	0.48
Hematological tumor, n (%)	2 (1.6)	0	0.99
Solid tumor, n (%)	15 (11.9)	2 (20.0)	0.61
Human immunodeficiency virus, n (%)	1 (0.8)	0	0.99
Renal replacement previously to ICU admission, n (%)	17 (13.5)	1 (10.0)	0.99
Corticosteroids previously to ICU admission, n (%)	14 (11.1)	1 (10.0)	0.99
Immunosuppressants previously to ICU admission, n (%)	10 (7.9)	1 (10.0)	0.58
Corticosteroids at CRI suspicion, n (%)	44 (34.9)	4 (40.0)	0.74
Parenteral nutrition at CRI suspicion, n (%)	17 (13.5)	3 (30.0)	0.17
Propofol at CRI suspicion, n (%)	69 (54.8)	8 (80.0)	0.19
Deaths at 30 d of CRI suspicion, n (%)	9 (7.1)	0	0.99

COPD: Chronic obstructive pulmonary disease; ICU: Intensive care unit; CVC: Central venous catheter; CRI: Catheter-related infection.

Table 2 Maki and vortexing results to diagnosis catheter tip colonization

	Maki +	Maki -	Total
Vortex +	18	0	18
Vortex -	3	115	118
Total	21	115	136

Table 3 Maki and vortexing results to diagnosis catheter-related bloodstream infection

	Maki +	Maki -	Total
Vortex +	9	0	9
Vortex -	1	126	127
Total	10	126	136