RT Journal Article
SR Electronic
T1 Bacterial Contamination of Circuit Inner Surfaces After High-Flow Oxygen Therapy
JF Respiratory Care
FD American Association for Respiratory Care
SP 545
OP 549
DO 10.4187/respcare.06299
VO 64
IS 5
A1 Onodera, Mutsuo
A1 Nakataki, Emiko
A1 Nakanishi, Nobuto
A1 Itagaki, Taiga
A1 Sato, Masami
A1 Oto, Jun
A1 Nishimura, Masaji
YR 2019
UL http://rc.rcjournal.com/content/64/5/545.abstract
AB BACKGROUND: During high-flow oxygen therapy, heated humidified gas is delivered at high flow. Although the warmth and humidity of this gas facilitates mucociliary function in the lower airway, warm and humid conditions also promote bacterial growth. Bacterial contamination of high-flow oxygen therapy circuits has not been well investigated. We examined the incidence of bacterial contamination in high-flow oxygen therapy circuits.METHODS: This was a prospective observational study in a university hospital 10-bed general ICU. After final high-flow oxygen therapy discontinuation, samples were obtained from the interface and the chamber ends of the circuit. Initially, a half circumference of each inner surface was swabbed, after which the whole circuit was left in the ICU at room temperature for 6 h. The samples were then, in the same way, taken from the previously unswabbed arcs of the end inner surfaces. All the samples were sent to a biology laboratory and cultured.RESULTS: In all, 118 samples were collected from 31 circuits. The median duration of high-flow oxygen therapy was 48 h (interquartile range, 26–96 h). Of 31 circuits, contamination occurred in 5 circuits (16.1% [95% CI 5.5–33.7%]).CONCLUSIONS: Bacterial contamination of inner surfaces of the circuit after high-flow oxygen therapy was relatively high.