Tracheal introducers and airway trauma COVID-19. Comment on Br J Anaesth 2020; 125: e168-e170

Comparison of aerosol box intubation with styletted endotracheal tube and intubation over bougie: A randomized controlled trial

Background and Aims

Severe acute respiratory syndrome coronavirus 2 (SARS CoV-2) is an infectious disease. The use of video laryngoscopes is recommended for intubation of patients with COVID-19. But in resource-poor countries, it is rare to have video laryngoscopes available. In this trial, we have compared the ease of oral intubation by direct laryngoscopy with styletted endotracheal tube and intubation over the bougie, with the use of the aerosol box. The secondary objectives were comparison of the incidence of airway loss, attempts taken to intubate, time for intubation and hemodynamic changes.

Material and Methods

80 non-coronavirus infected patients coming for an elective procedure under general anesthesia were recruited in this randomized control trial. Participants were assigned into groups S and B using a computer-generated random sequence of numbers by closed envelope technique. In both groups, aerosol box was used. In Group S, participants were intubated by direct laryngoscopy with a styletted endotracheal tube and in group B, after direct laryngoscopy, the endotracheal tube was railroaded over the bougie.

Results

Ease of endotracheal intubation was good (67.5%% vs. 45%), satisfactory (32.5%% vs. 37.5%), and poor (0% vs. 17.5%) in group S and B respectively (P < 0.011). The attempts required for intubation were similar in both groups. The time for intubation was significantly less in group S than B (23 vs. 55 s).

Conclusion

The use of a styletted endotracheal tube made intubation easier and faster than tracheal intubation with bougie when the aerosol box was used in patients without known or predicted difficult airway and significant medical comorbidities.

Human Factors and Airway Management in COVID-19 Patients: The Perfect Storm?

The SARS-CoV-2 pandemic heavily impacted healthcare workers, increasing their physical and psychological workload. Specifically, COVID-19 patients’ airway management is definitely a challenging task regarding both severe and acute respiratory failure and the risk of contagion while performing aerosol-generating procedures. The category of anesthesiologists and intensivists, the main actors of airway management, showed a poor psychological well-being and a high stress and burnout risk. Identifying and better defining the specific main SARS-CoV-2-related stressors can help them deal with and effectively plan a strategy to manage these patients in a more confident and safer way. In this review, we therefore try to analyze the relevance of human factors and non-technical skills when approaching COVID-19 patients. Lessons from the past, such as National Audit Project 4 recommendations, have taught us that safe airway management should be based on preoperative assessment, the planning of an adequate strategy, the optimization of setting and resources and the rigorous evaluation of the scenario. Despite, or thanks to, the critical issues and difficulties, the “take home lesson” that we can translate from SARS-CoV-2 to every airway management is that there can be no more room for improvisation and that creating teamwork must become a priority.

An assessment of introducers used for airway management

Different introducers are available to assist with tracheal intubation. Subtle differences in the design of introducers can have a marked effect on safety and performance. The Difficult Airway Society's Airway Device Evaluation Project Team proposal states that devices should only be purchased for which there is at least a case-control study on patients assessing airway devices. However, resources are not currently available to carry out a case-control study on all introducers available on the market. This study comprised a laboratory and manikin-based investigation to identify introducers that could be suitable for clinical investigation. We included six different introducers in laboratory-based assessments (design characteristics) and manikin-based assessments involving the participation of 30 anaesthetists. Each anaesthetist attempted placement in the manikin's trachea with each of the six introducers in a random order. Outcomes included first-time insertion success rate; insertion success rate; number of attempts; time to placement; and distance placed. Each anaesthetist also completed a questionnaire. First-time insertion success rate depended significantly on the introducer used (p = 0.0016) and varied from 47% (Armstrong and P3) to 77% (Intersurgical and Frova). Median time to placement (including oesophageal placement) varied from 10 s (Eschmann and Frova) to 20 s (P3) (p = 0.0025). Median time to successful placement in the trachea varied from 9 s (Frova) to 22 s (Armstrong) (p = 0.037). We found that the Armstrong and P3 devices were not as acceptable as other introducers and, without significant improvements to their design and characteristics, the use of these devices in studies on patients is questionable. The study protocol is suitable for differentiating between different introducers and could be used as a basis for assessing other types of devices.

COVID-19 patients in the operating room: a concise review of existing literature

A novel Coronavirus was identified in late 2019 as the cause of COVID-19 disease which is highly contagious. SARS-CoV-2 is a single-stranded RNA, enveloped virus from the beta Coronavirus family. Intraoperative management of patients with COVID-19 is a high-risk procedure. An international attention has raised to develop recommendations for the management strategies. This review article was designed to synthesize the existing evidence and experience related to intraoperative management of COVID-19. This review provides a summary of clinical guidance and addresses six domains: principles of intraoperative monitoring, airway management and related difficulties, ventilation, type of anesthesia, medications and side effects, and intraoperative fluid management.