A Practical Solution for Preoxygenation in the Prehospital Setting: A Nonrebreather Mask with Flush Rate Oxygen.

OBJECTIVE: Prehospital clinicians need a practical means of providing adequate preoxygenation prior to intubation. A bag-valve-mask (BVM) can be used for preoxygenation in perfect conditions but is likely to fail in emergency settings. For this reason, many airway experts have moved away from using BVM for preoxygenation and instead suggest using a nonrebreather (NRB) mask with flush rate oxygen.Literature on preoxygenation has suggested that a NRB mask delivering flush rate oxygen (on a 15 L/min O2 regulator, maximum flow, ∼50 L/min) is noninferior to BVM at 15 L/min held with a tight seal. However, in the prehospital setting, where emergency airway management success varies, preoxygenation techniques have not been deeply explored. Our study seeks to determine whether preoxygenation can be optimally performed with NRB at flush rate oxygen. METHODS: We performed a crossover trial using healthy volunteers. Subjects underwent 3-min trials of preoxygenation with NRB mask at 25 L/min oxygen delivered from a portable tank, NRB at flush rate oxygen from a portable tank, NRB with flush rate oxygen from an onboard ambulance tank, and BVM with flush rate oxygen from an onboard ambulance tank. The primary outcome was the fraction of expired oxygen (FeO2). We compared the FeO2 of the BVM-flush to other study groups, using a noninferiority margin of 10%. RESULTS: We enrolled 30 subjects. Mean FeO2 values for NRB-25, NRB-flush ambulance, NRB-flush portable, and BVM-flush were 63% (95% confidence interval [CI] 58-68%), 74% (95%, CI 70-78%), 78% (95%, CI 74-83%), and 80% (95%, CI 75-84%), respectively. FeO2 values for NRB-flush on both portable tank and ambulance oxygen were noninferior to BVM-flush on the ambulance oxygen system (FeO2 differences of 1%, 95% CI -3% to 6%; and 6%, 95% CI 1-10%). FeO2 for the NRB-25 group was inferior to BVM-flush (FeO2 difference 16%, 95% CI 12-21%). CONCLUSIONS: Among healthy volunteers, flush rate preoxygenation using NRB masks is noninferior to BVM using either a portable oxygen tank or ambulance oxygen. This is significant because preoxygenation using NRB masks with flush rate oxygen presents a simpler alternative to the use of BVMs. Preoxygenation using NRB masks at 25 L/min from a portable tank is inferior to BVM at flush rate.

Evaluating the impact of a training program in prehospital trauma care and mental health for traffic police in Arusha, Tanzania.

BACKGROUND: Tanzania does not have a formalized prehospital Emergency Medical Services (EMS) response. As a result, traffic police play an integral role in the emergency response system. This study examines the potential impact of a brief training program in prehospital trauma care and mental health to improve knowledge, self-efficacy, and practice intentions related to trauma care among police officers. METHOD: A cohort of 45 police officers were enrolled to participate in the training and accompanying evaluation. The training was 12 h long, held over 3 days, and included education on how to manage traumatic injuries in a prehospital environment. The course included classroom instruction, hands on skills practice, and a training simulation. Officers received instruction on conducting a primary survey, managing common airway, spinal cord, and bleeding emergencies, as well as coping strategies for their own mental health. Before and after the course, a 26-item assessment was administered to measure knowledge, self-efficacy, and practice intentions specific to the training. The study used paired-samples t-tests to compare scores in each of the three domains before and after the training. RESULTS: Participants demonstrated significantly improved knowledge (M = 0.30, SD = 0.27; t(34) = 6.67, p <.001), greater self-efficacy (M = 0.44, SD = 0.53; t(34) = 4.97, p <.001), and more evidence-informed practice intentions (M = 0.12, SD = 0.28; t(34) = 2.55, p <.05) at the conclusion of the course. CONCLUSION: Police officers who received the 12-hour training focused on trauma management were better prepared to respond to emergencies and demonstrated a greater understanding of prehospital trauma care. Further studies are required to assess real world impact of the training and to determine how to increase support for traffic police as emergency medical responders in low-resource settings.