Benefit of the SALAD Technique on CPR Quality During Intubation in Contaminated Airway

The study was conducted in March 2024. Participants were emergency medical technician-paramedics (EMT-Ps) employed by fire departments across Taiwan, recruited on a nationwide basis. All participants provided signed informed consent forms. 36 EMT-Ps are involved in this study.

Simulation setup :

The CPR-induced regurgitation model was adapted from an Airway Larry Airway Management Trainer Torso (Nasco, Fort Atkinson, WI, USA) to simulate oropharyngeal regurgitation during CPR. To emulate the stomach, a manual pump was attached at the base of the manikin's torso. A transparent vinyl tube connected the manikin's esophagus to the pump's outlet port. A HQCPR device was used for CPR quality record.

Training program The 36 participants received 2.5 hours of SALAD training. The training included 5 rounds of intubation teaching and practice. The first two rounds of training involve using the SALAD technique with the video laryngoscope, while the third round used the C-MAC S video laryngoscope as a direct laryngoscope for practice. Technique adjustments can be made during the initial three rounds through monitoring with the video system. The fourth round will involve intubation using a direct laryngoscope with a size 3 Macintosh blade on the SALAD Simulator. The final round involved intubation on the CPR-induced regurgitation model, using a direct laryngoscope and employing the SALAD technique for intubation during chest compressions.

Simulation protocol After completing 2.5 hours of training, participants were randomly assigned to one of two groups for suction techniques: SALAD or intermittent suction. Randomization was conducted using the simple randomization method with a random number table. Participants assigned to the same suction technique group formed a resuscitation team, taking on roles as the airway manager, first chest compressor, or second chest compressor. Each participant rotated through these three roles during three simulation sessions.In each simulation, the airway manager was responsible for BVM ventilation and intubation. The first and second chest compressors performed chest compressions alternately, once every five CPR cycles, adhering to a 30:2 compression-to- ventilation ratio. The initial 30 chest compressions were followed by two ventilations, and suction was not performed during this phase, even if regurgitation was present. This was intended to simulate a scenario where the oral cavity was filled with regurgitant material during intubation, maintaining consistency across participants. After the first two ventilations, intubation could proceed while the team continued chest compressions. The airway manager could request a temporary reduction, lightening, or even cessation of chest compressions to facilitate intubation, or to continue up to 60 compressions without interruption if necessary. If the intubation attempt was unsuccessful, the airway manager had to administer two BVM ventilations before attempting intubation again. Depending on the group assignment, either SALAD or intermittent suction techniques were employed to assist in airway decontamination. After intubation, the airway manager assessed lung expansion using the BVM to verify successful intubation. A failed intubation was defined as any esophageal intubation or three unsuccessful intubation attempts. Each simulation concluded following either a successful or failed intubation.