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Minimising exposure to droplet and aerosolised pathogens: a computational fluid dynamics study.
Perella, Paolo; Tabarra, Mohammad; Hataysal, Ertan; Pournasr, Amir; Renfrew, Ian.
  • Perella P; Department of Anaesthesia & Perioperative Medicine, Royal London Hospital, Barts Health NHS Trust, London, UK. Electronic address: paolo.perella1@nhs.net.
  • Tabarra M; Arup, London, UK.
  • Hataysal E; Arup, London, UK.
  • Pournasr A; Arup, London, UK.
  • Renfrew I; Department of Interventional Radiology, Royal London Hospital, Barts Health NHS Trust, London, UK.
Br J Anaesth ; 126(2): 544-549, 2021 02.
Article in English | MEDLINE | ID: covidwho-934893
Semantic information from SemMedBD (by NLM)
1. Coughing COEXISTS_WITH Present
Subject
Coughing
Predicate
COEXISTS_WITH
Object
Present
2. Coughing COEXISTS_WITH Present
Subject
Coughing
Predicate
COEXISTS_WITH
Object
Present
ABSTRACT

BACKGROUND:

Hazardous pathogens are spread in either droplets or aerosols produced during aerosol-generating procedures (AGP). Adjuncts minimising exposure of healthcare workers to hazardous pathogens released during AGP may be beneficial. We used state-of-the-art computational fluid dynamics (CFD) modelling to optimise the performance of a custom-designed shield.

METHODS:

We modelled airflow patterns and trajectories of particles (size range 1-500 µm) emitted during a typical cough using CFD (ANSYS Fluent software, Canonsburg, PA, USA), in the presence and absence of a protective shield enclosing the head of a patient. We modelled the effect of different shield designs, suction tube position, and suction flow rate on particle escape from the shield.

RESULTS:

Use of the shield prevented escape of 99.1-100% of particles, which were either trapped on the shield walls (16-21%) or extracted via suction (79-82%). At most, 0.9% particles remained floating inside the shield. Suction flow rates (40-160 L min-1) had no effect on the final location of particles in a closed system. Particle removal from within the shield was optimal when a suction catheter was placed vertically next to the head of the patient. Addition of multiple openings in the shield reduced the purging performance from 99% at 160 L min-1 to 67% at 40 L min-1.

CONCLUSION:

CFD modelling provides information to guide optimisation of the efficient removal of hazardous pathogens released during AGP from a custom-designed shield. These data are essential to establish before clinical use, pragmatic clinical trials, or both.
Subject(s)
Keywords

Full text: Available Collection: International databases Database: MEDLINE Main subject: Occupational Exposure / Infectious Disease Transmission, Patient-to-Professional / Hydrodynamics / Personal Protective Equipment / COVID-19 / Models, Theoretical Limits: Humans Language: English Journal: Br J Anaesth Year: 2021 Document Type: Article

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Occupational Exposure / Infectious Disease Transmission, Patient-to-Professional / Hydrodynamics / Personal Protective Equipment / COVID-19 / Models, Theoretical Limits: Humans Language: English Journal: Br J Anaesth Year: 2021 Document Type: Article