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Introduction: Patients undergoing surgery under general anaesthesia are frequently intubated with an endotracheal tube (ETT). The safety margin of ETT cuff pressure is between 20-30 cmH2O. Inadequately inflated cuff (\<20 cmH2O) may cause secretions in the mouth, foreign bodies, bleeding due to surgery to escape into the trachea and/or air leakage. As a result of air leakage, the effect of mechanical ventilation decreases, end-tidal CO2 measurement cannot be performed accurately, and inhalation anaesthetics leak into the operating room. An overinflated cuff (\>30 cmH2O) may affect tracheal mucosa blood flow. This may result in tracheal stenosis, tracheoesophageal fistula or tracheal rupture. There may be significant changes in cuff pressure during endotracheal intubation because cuff pressure can be affected by changes in head and neck position. Due to all these situations, controlling E
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