Blood cultures from arterial catheters
Abstract:
Background: Collecting blood cultures from indwelling arterial catheters is an attractive option in critically ill adult patients when peripheral venipuncture is difficult. However, whether the contamination proportion of blood cultures from arterial catheters is acceptable compared with that from venipuncture is inconclusive.
Research question: Is contamination of blood cultures from arterial catheters noninferior to that from venipuncture in critically ill adult patients with suspected bloodstream infection?
Study design and methods: In this multicenter prospective diagnostic study conducted at five hospitals, clinically indicated, paired blood cultures, each set consisting of blood drawn from an arterial catheter and another by venipuncture, were obtained from critically ill adult patients. The primary measure was the proportion of contamination, defined as the number of false-positive results relative to the total number of procedures done. The reference standard for true bloodstream infection was blinded assessment by infectious disease specialists. We examined the noninferiority hypothesis that the contamination proportion of blood cultures from arterial catheters did not exceed that from venipuncture by 2.0%.
Results: Of 1,655 episodes of blood culture from December 2018 to July 2021, 590 paired blood cultures were obtained, and 41 of the 590 sets (6.9%) produced a true bloodstream infection. In blood cultures from arterial catheters, 33 of 590 (6.0%) were positive, and 2 of 590 (0.3%) were contaminated; in venipuncture, 36 of 590 (6.1%) were positive, and 4 of 590 (0.7%) were contaminated. The estimated difference in contamination proportion (arterial catheter – venipuncture) was -0.3% (upper limit of one-sided 95% CI, +0.3%). The upper limit of the 95% CI did not exceed the predefined margin of +2.0%, establishing noninferiority (P for noninferiority < .001).
Interpretation: Obtaining blood cultures from arterial catheters is an acceptable alternative to venipuncture in critically ill patients.
Clinical trial registration: University Hospital Medical Information Network Center (UMIN-CTR); No.: UMIN000035392; URL: https://center6.umin.ac.jp/.
Reference:
Nakayama I, Izawa J, Gibo K, Murakami S, Akiyama T, Kotani Y, Katsurai R, Kishihara Y, Tsuchida T, Takakura S, Takayama Y, Narita M, Shiiki S. Contamination of Blood Cultures From Arterial Catheters and Peripheral Venipuncture in Critically Ill Patients: A Prospective Multicenter Diagnostic Study. Chest. 2023 Jan 30:S0012-3692(23)00161-7. doi: 10.1016/j.chest.2023.01.030. Epub ahead of print. PMID: 36731787.