Bacterial Contamination of Circuit Inner Surfaces After High-Flow Oxygen Therapy.

Abstract:

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.

journal_name

Respir Care

journal_title

Respiratory care

authors

Onodera M,Nakataki E,Nakanishi N,Itagaki T,Sato M,Oto J,Nishimura M

doi

10.4187/respcare.06299

subject

Has Abstract

pub_date

2019-05-01 00:00:00

pages

545-549

issue

5

eissn

0020-1324

issn

1943-3654

pii

respcare.06299

journal_volume

64

pub_type

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