Assessment of assynchronies on pressure time product (PTP) in active pediatric patients
Authors: CEYLAN Gokhan , TOPAL Sevgi , SARAÇ SANDAL Özlem , ATAKUL Gülhan , COLAK Mustafa , SOYDAN Ekin , SEVEN Pınar , SARI Ferhat , KARAARSLAN Utku , AĞIN Hasan 
Published: March 2022

Aim: To reveal the effect of synchronous or asynchronous patients on these values by examining the esophageal pressure (Pes ), transpulmonary pressure (PL), and time-pressure-product (PTP) in active patients who are planned to be weaned from the mechanical ventilator and can trigger their own respiration.

Material and Methods: Patients who are monitored on a mechanical ventilator and who can trigger their own respiration, and who are planned to be separated from the mechanical ventilator in the near future, were taken and an esophageal catheter was inserted, then the catheter filling volume was first optimized and then validated, and PL was started to be recorded by removing Pes from the airway pressure. With the recording devices on the ventilator, the mechanical ventilation parameters of the patients were recorded as both monitoring values and waveforms. Then, the mechanical ventilation settings were rearranged by the clinician at the bedside with reference to the esophageal waveform. Then, the waveforms of these patients have examined on the Matlab E2019a (Mathworks, USA) software, and each breath was marked as synchronous-asynchronous and the asynchrony index (AI) was calculated. Accordingly, the asynchronous and synchronous periods of the patient were defined, and the values of ∆Pes, ∆PL, PTP-Pes, PTP-PL, PTP-Pes-minutes, PTP-PL-minutes between the synchronous and asynchronous periods of the same patient were calculated on Matlab software, and synchronous and The changes in these values between asynchronous periods were analyzed with the SPSS statistical program. After examining the distribution of the variables by visual and analytical methods (Shapiro-Wilk), the statistical difference between the groups was examined.

Results: When the synchronous and asynchronous periods of all patients were compared, the following differences were found between the synchronous and asynchronous groups in favor of the synchronous group. ∆Peso [5.98 (3.55-9.08)] cmH2O, ∆PL [5 (2.7-7.25]cmH2O, ∆PTP-Peso [3.70 (2.81-4.6)) ]cmH2O*s, ∆PTP-PL [3.36 (1.39-4.18)]cmH2O*s, ∆PTP-Peso/min [1.72 (1.02-2.67)]cmH2O*min , ∆PTP-PL/min [1.25 (0.30-3.01)]cmH2O*min.

Conclusion: It has also been shown by statistical analyzes that the synchronization of active patients who are planned to be weaned from mechanical ventilator and who can trigger their own respiration causes a decrease in the values of ∆Peso, ∆Ptranspulmonary, PTP-Peso,PTP-Ptranspulmonary, PTP-Peso-minute, PTP-Ptranspulmonary-minute. When this information about synchronization is correlated with the literature, Pes monitoring in patients and synchronization of patients prevent mechanical ventilation-related lung damage that may occur in these patients, and thus the duration of hospital stay due to asynchrony, failure to wean from the ventilator, and the consequences that may occur. It is a method that can be useful in reducing mortality and morbidity.