The Multi Split Ventilator System: Performance Testing of Respiratory Support Shared by Multiple Patients

Ventilator sharing has been proposed as a method of increasing ventilator capacity during instances of critical shortage. We sought to assess the ability of a regulated, shared ventilator system (Multi Split Ventilator System, MSVS) to individualize support to multiple simulated patients using one ventilator. We employed simulated patients of varying size, compliance, minute ventilation requirement, and PEEP requirement. Performance tests were performed to assess the ability of the QSVS, versus control, to achieve individualized respiratory goals to clinically disparate patients sharing a single ventilator following ARDSNet guidelines. Resilience tests measured the effects of simulated adverse events occurring to one patient on another patient sharing a single ventilator. The QSVS met individual oxygenation and ventilation requirements for multiple simulated patients with a tolerance similar to a single ventilator. Abrupt endotracheal tube occlusion or extubation occurring to one patient resulted in modest, clinically tolerable changes in ventilation parameters for the remaining patients. The QSVS is a regulated, shared ventilator system capable of individualizing ventilatory support to clinically dissimilar simulated patients. It is also resilient to common adverse events. The QSVS represents a feasible option to ventilate multiple patients during a severe ventilator shortage.

Positive Airway Pressure at Extubation Minimizes Subglottic Secretion Leak In Vitro

Accumulated secretion above the endotracheal tube cuff can be aspirated during extubation after deflation. The possible techniques for minimizing pulmonary aspiration from subglottic secretion during extubation have not been well explored. This study aimed to determine the effect of different extubation techniques on secretion leakage. An endotracheal tube was placed in a tube mimicking an airway. We measured the leak volume of water or artificial sputum of different viscosities with three extubation techniques—negative pressure with suctioning; positive pressure with a resuscitator; and continuous positive airway pressure set at 5, 10, and 20 cm H2O. Extubation with continuous positive airway pressure resulted in lower secretion leakage than that with negative pressure with suctioning and positive pressure with a resuscitator. Increasing the continuous positive airway pressure level decreased secretion leakage volume during extubation. We further determined a correlation of leak volume with sputum viscosity. Continuous positive airway pressure at 5 cm H2O produced lower volume secretion leakage than the other two techniques, even with higher secretion viscosity. Based on these results, using continuous positive airway pressure with a previous ventilator continuous positive airway pressure/positive end-expiratory pressure setting for extubation is recommended.

The Comparison of Duration Endotracheal Tube Insertion Using Aerosol Box And without Aerosol Box in Elective Surgery Patients in the Covid-19 Pandemic

Introduction. The aerosol box can reduce the risk of droplet and aerosol transmission from the patient to the operator when performing intubation, but in practice, an aerosol box makes the glottis visualization less evident, and the operator moves less space with less space the aerosol box. This study aimed to compare ETT duration using an aerosol box and without an aerosol box using a video laryngoscope. Methods: This study was a clinical trial with a post-test-only control design. The study was carried out from February 2021 to May 2021 at the Central Operating Theater of dr. Mohammad Hoesin General Hospital Palembang. The sample in this study was all patients who underwent elective surgery under general anesthesia using intubation at the Central Surgical Installation of dr. Mohammad Hoesin Palembang. After the data is collected, it is analyzed using the SPSS 22.0 program with the appropriate test. Results. There were no differences in subject characteristics (age, sex, BMI, Mallampati score, TMD, Cormack Lehane, limited mouth opening, short neck, limited mouth movement) between the group using the aerosol box and the group without the aerosol box. The duration of intubation without an aerosol box is 30.67 + 2.63 seconds, and using an aerosol box is 44.53 + 2.89 seconds. There was a significant difference between the two groups in the duration of patient intubation (p < 0.001). However, there was no significant difference in complications in the two groups (p >0.05). Conclusion. The duration of the endotracheal tube insertion using an aerosol box is more extended than without an aerosol box in elective surgery patients.

Evaluation of using distal part of endotracheal tube samples for SARS-COV-2 diagnosis by RT-PCR

Objective: The reverse transcription-polymerase chain reaction (RT-PCR) analyses method is the most important diagnostic method in the diagnosis of SARS-CoV-2 virus infection. In this research, we aimed to investigate the positivity of SARS-CoV-2 by RT-PCR from distal part of the endotracheal tube (DPET) samples, which have not been investigated in any study yet. Materials and Methods: A total of 48 patients with a diagnosis of COVID-19 hospitalized in the intensive care unit receiving mechanical ventilation and whose conditions resulted in death or extubation were included in the study. The distal 6 cm part of the orotracheal intubation tube was removed from the patient (including the cuff). DPET samples were mixed with viral transport medium and vortexed; then, it was centrifuged at 4500g for 4 minutes. RNA isolation was performed by taking 400 µl from the supernatant and then SARS-CoV-2 RT-PCR was studied. Results: In 15 patients (31.25 %) the swab samples were PCR positive, 42 patients (87.5 %) had positive computed tomography finding and 48 patients (100 %) had positive clinical findings. Among the patients whose oropharynx (OP)/nasopharynx (NP) combined swab sample was positive for RT-PCR, the rate of RT-PCR positivity detected in DPET samples was 26.7%. While OP/NP combined swab sample was negative, DPET RT-PCR positivity rate was found to be 9.09%. Conclusions: Patients with positive DPET RT-PCR are detected when the swab is negative. These findings suggest that DPET can be used as a good lower respiratory sample without the risk of particle spread and transmission to healthcare personnel.

Intraoperative recurrent laryngeal nerve monitoring in unconventional thyroid surgery

The authors herewith present a case of a non-conventional use of endotracheal tube-based IONM in a second-stage total thyroidectomy for metastatic papillary cancer incidentally detected after OPHL Type IIa + ary left for SCC. The use of the IONM in such case was effective avoiding the RLN accidental injury.