Comparison of Endotracheal Tube Cuff Pressure with Passive Release Technique for Cuff Inflation between Disposable and Loss of Resistance Syringe in Patients Undergoing General Anesthesia
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Abstract
Background: The standard technique to maintain optimal endotracheal tube cuff pressure is the manometer, but it is not always available. Passive release technique has been shown in previous studies to be one of the most accurate alternative methods to provide cuff pressure within an optimal range (20-30 cmH2O). The objective of the study is to compare endotracheal tube cuff pressure in patients undergoing general anesthesia by inflating the endotracheal cuff with passive release technique between two types of syringes; disposable and loss of resistance syringes. Methods: A prospective double-blinded randomized control study was conducted in Rajavithi Hospital, enrolling patients undergoing elective surgery under general anesthesia with endotracheal tube. Cuff pressure after passive release technique was measured. If cuff pressure was less than 20 cmH2O, air inflation was done until it reached 20 cmH2O. If cuff pressure exceeded 30 cmH2O, air deflation was done until it reached 25 cmH2O. Results: One hundred patients were randomized to the disposable syringe and loss of resistance syringe group, with fifty patients in each group. Mean cuff pressure after passive release technique was 29.24±6.02 cmH2O in the disposable syringe group which was statistically significantly different from the loss of resistance syringe group (19.24±6.27 cmH2O). There were 23 patients (46%) in the disposable syringe group and 15 patients (30%) in the loss of resistance group with cuff pressure within an optimal range. Conclusion: The disposable syringe group was superior to the loss of resistance syringe group in providing cuff pressure within an optimal range.
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