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10.1111/anae.15292

http://scihub22266oqcxt.onion/10.1111/anae.15292
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33022093!7675579!33022093
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suck abstract from ncbi


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pmid33022093      Anaesthesia 2021 ; 76 (2): 174-181
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  • A quantitative evaluation of aerosol generation during tracheal intubation and extubation #MMPMID33022093
  • Brown J; Gregson FKA; Shrimpton A; Cook TM; Bzdek BR; Reid JP; Pickering AE
  • Anaesthesia 2021[Feb]; 76 (2): 174-181 PMID33022093show ga
  • The potential aerosolised transmission of severe acute respiratory syndrome coronavirus-2 is of global concern. Airborne precaution personal protective equipment and preventative measures are universally mandated for medical procedures deemed to be aerosol generating. The implementation of these measures is having a huge impact on healthcare provision. There is currently a lack of quantitative evidence on the number and size of airborne particles produced during aerosol-generating procedures to inform risk assessments. To address this evidence gap, we conducted real-time, high-resolution environmental monitoring in ultraclean ventilation operating theatres during tracheal intubation and extubation sequences. Continuous sampling with an optical particle sizer allowed characterisation of aerosol generation within the zone between the patient and anaesthetist. Aerosol monitoring showed a very low background particle count (0.4 particles.l(-1) ) allowing resolution of transient increases in airborne particles associated with airway management. As a positive reference control, we quantitated the aerosol produced in the same setting by a volitional cough (average concentration, 732 (418) particles.l(-1) , n = 38). Tracheal intubation including facemask ventilation produced very low quantities of aerosolised particles (average concentration, 1.4 (1.4) particles.l(-1) , n = 14, p < 0.0001 vs. cough). Tracheal extubation, particularly when the patient coughed, produced a detectable aerosol (21 (18) l(-1) , n = 10) which was 15-fold greater than intubation (p = 0.0004) but 35-fold less than a volitional cough (p < 0.0001). The study does not support the designation of elective tracheal intubation as an aerosol-generating procedure. Extubation generates more detectable aerosol than intubation but falls below the current criterion for designation as a high-risk aerosol-generating procedure. These novel findings from real-time aerosol detection in a routine healthcare setting provide a quantitative methodology for risk assessment that can be extended to other airway management techniques and clinical settings. They also indicate the need for reappraisal of what constitutes an aerosol-generating procedure and the associated precautions for routine anaesthetic airway management.
  • |*Aerosols[MESH]
  • |*Airway Extubation[MESH]
  • |*Intubation, Intratracheal[MESH]
  • |Airway Management[MESH]
  • |Anesthesia[MESH]
  • |Anesthetists[MESH]
  • |COVID-19/*transmission[MESH]
  • |Cough[MESH]
  • |Environmental Monitoring[MESH]
  • |Humans[MESH]
  • |Operating Rooms[MESH]
  • |Particle Size[MESH]
  • |Patients[MESH]
  • |Personal Protective Equipment[MESH]
  • |Prospective Studies[MESH]
  • |Respiration, Artificial[MESH]
  • |SARS-CoV-2[MESH]


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