بررسي مقايسه اي تغييرات فشار كاف لوله تراشه ساخت ايران و خارج در مجاورت گاز نايتروس اكسايد

Comparing cuff pressure changes in two types of endotracheal tube

Background Since medical devices from different manufacturers with various qualities may affect on outcome of interventions. studies regarding the correctness of them in terms of material and function have always been a major topic. Purpose This clinical trial was conducted to compare cuff pressure changes in two endotracheal tubes (ETT) in contact with nitrous oxide gas, manufactured in han and Malaysia. Methods SO patients having elective surgery in Loghman Hakim Hospital and categorized in classes I and 2 according to American Society of Anesthesiology (ASA I, 0) were randomly divided into 2 groups (27 and 23 subjects). In the first group with 27 subjects, Iranian tubes and in the other, Malasian ones were used. ETT cuffs were filled with air via minimal leak method and cuff pressures were measured by a cuff pressure indicator (YBM). It was connected to a pilot cuff until the end of anesthesia. Meanwhile, nitrous oxide 50% was prescribed for patients during anesthesia and the pressure was recorded every 20 minutes until 120 minutes of anesthesia. Results Mean and standard deviation of pressures in the cuffs ofIranian tubes before nitrous oxide administration were 96.43 and 8.23 respectively. The corresponding figures lor pressures in Malaysian tubes were 17.32 and 97.4, which showed a significant difference (t=2.585, P=0.OI5). The standard deviation of Iranian tubes was significantly greater than Malysian ones (F=38.633, P