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A Bench Comparison of the Effect of High-Flow Oxygen Devices on Work of Breathing.
Guérin, Claude; Cour, Martin; Degivry, Florian; Argaud, Laurent; Louis, Bruno.
  • Guérin C; Medicine Intensive-Réanimation Hôpital Edouard Herriot, Lyon, France; Université de Lyon, Lyon, France; and Institut Mondor de Recherches Biomédicales, INSERM 955, CNRS ERL 7000, Créteil, France. claude.guerin@chu-lyon.fr.
  • Cour M; Medicine Intensive-Réanimation Hôpital Edouard Herriot, Lyon, France; and Université de Lyon, Lyon, France.
  • Degivry F; Medicine Intensive-Réanimation Hôpital Edouard Herriot, Lyon, France.
  • Argaud L; Medicine Intensive-Réanimation Hôpital Edouard Herriot, Lyon, France; and Université de Lyon, Lyon, France.
  • Louis B; Institut Mondor de Recherches Biomédicales, INSERM 955, CNRS ERL 7000, Créteil, France.
Respir Care ; 67(9): 1129-1137, 2022 09.
Article in English | MEDLINE | ID: covidwho-1924458
ABSTRACT

BACKGROUND:

Oxygen therapy via high-flow nasal cannula (HFNC) has been extensively used during the COVID-19 pandemic. The number of devices has also increased. We conducted this study to answer the following questions Do HFNC devices differ from the original device for work of breathing (WOB) and generated PEEP?

METHODS:

Seven devices were tested on ASL 5000 lung model. Compliance was set to 40 mL/cm H2O and resistance to 10 cm H2O/L/s. The devices were connected to a manikin head via a nasal cannula with FIO2 set at 0.21. The measurements were performed at baseline (manikin head free of nasal cannula) and then with the cannula and the device attached with oxygen flow set at 20, 40, and 60 L/min. WOB and PEEP were assessed at 3 simulated inspiratory efforts (-5, -10, -15 cm H2O muscular pressure) and at 2 breathing frequencies (20 and 30 breaths/min). Data were expressed as median (first-third quartiles) and compared with nonparametric tests to the Optiflow device taken as reference.

RESULTS:

Baseline WOB and PEEP were comparable between devices. Over all the conditions tested, WOB was 4.2 (1.0-9.4) J/min with the reference device, and the relative variations from it were 0, -3 (2-4), 1 (0-1), -2 (1-2), -1 (1-2), and -1 (1-2)% with Airvo 2, G5, HM80, T60, V500, and V60 Plus devices, respectively, (P < .05 Kruskal-Wallis test). PEEP was 0.9 (0.3-1.5) cm H2O with Optiflow, and the relative differences were -28 (22-33), -41 (38-46), -30 (26-36), -31 (28-34), -37 (32-42), and -24 (21-34)% with Airvo 2, G5, HM80, T60, V500, and V60 Plus devices, respectively, (P < .05 Kruskal-Wallis test).

CONCLUSIONS:

WOB was marginally higher and PEEP marginally lower with devices as compared to the reference device.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Oxygen / COVID-19 Type of study: Experimental Studies Topics: Variants Limits: Humans Language: English Journal: Respir Care Year: 2022 Document Type: Article Affiliation country: Respcare.09889

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Oxygen / COVID-19 Type of study: Experimental Studies Topics: Variants Limits: Humans Language: English Journal: Respir Care Year: 2022 Document Type: Article Affiliation country: Respcare.09889