Exhalation Spreading During Nasal High-Flow Therapy at Different Flow Rates
| Autor: | Hayder Alsaad, Conrad Voelker, J. Kerl, Amayu Wakoya Gena, Dominic Dellweg |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Adult
Male Respiratory rate Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Online Clinical Investigation Critical Care and Intensive Care Medicine 03 medical and health sciences 0302 clinical medicine Respiratory Rate Disease Transmission Infectious Tidal Volume medicine Cannula Humans Tidal volume Microscopy Video business.industry Oxygen Inhalation Therapy respiratory failure Exhalation 030208 emergency & critical care medicine infection control Healthy Volunteers Sagittal plane Surgical mask respiratory support medicine.anatomical_structure 030228 respiratory system Anesthesia ComputingMethodologies_DOCUMENTANDTEXTPROCESSING Breathing nasal high-flow schlieren imaging Pulmonary Ventilation business severe acute respiratory syndrome coronavirus 2 |
| Zdroj: | Critical Care Medicine |
| ISSN: | 0090-3493 |
| Popis: | Supplemental Digital Content is available in the text. OBJECTIVES: Severe acute respiratory syndrome coronavirus 2 is transmitted through aerosols and droplets. Nasal high-flow therapy could possibly increase the spreading of exhalates from patients. The aim of this study is to investigate whether nasal high-flow therapy affects the range of the expiratory plume compared with spontaneous breathing. DESIGN: Interventional experiment on single breaths of a healthy volunteer. SETTING: Research laboratory at the Bauhaus-University Weimar. Subjects: A male subject. INTERVENTIONS: Videos and images from a schlieren optical system were analyzed during spontaneous breathing and different nasal high-flow rates. MEASUREMENTS AND MAIN RESULTS: The maximal exhalation spread was 0.99, 2.18, 2.92, and 4.1 m during spontaneous breathing, nasal high-flow of 20 L/min, nasal high-flow of 40 L/min, and nasal high-flow of 60 L/min, respectively. Spreading of the expiratory plume in the sagittal plane can completely be blocked with a surgical mask. CONCLUSIONS: Nasal high-flow therapy increases the range of the expiratory air up to more than 4 meters. The risk to pick up infectious particles could be increased within this range. Attachment of a surgical mask over the nasal high-flow cannula blocks the expiratory airstream. |
| Databáze: | OpenAIRE |
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