Simple on-line endotracheal cuff pressure relief valve

Area of Science:

• Anesthesiology
• Critical Care Medicine
• Otorhinolaryngology

Background:

• Endotracheal tube cuff pressure is linked to tracheal mucosal ischemia and injury.
• High cuff pressures (≥45 cm H2O) cause total obstruction of tracheal mucosal blood flow.
• Tracheal mucosal damage can lead to serious post-intubation complications.

Purpose of the Study:

• To introduce a simple, inexpensive method for monitoring endotracheal tube cuff pressure.
• To assess the efficacy of this method in preventing excessive cuff pressure and leakage.
• To evaluate the impact of this monitoring technique on patient safety during surgery.

Main Methods:

• A 20-mL syringe was connected in-line to the endotracheal tube cuff.
• The cuff was inflated with 15 mL of air and the syringe remained connected.
• Intracuff pressure was monitored in 120 patients undergoing ear or neck surgery.
• Pressure was compared with a standard aneroid gauge, and leakage was assessed by auscultation.

Main Results:

• The syringe method demonstrated consistent intracuff pressure readings throughout surgery.
• No significant differences were found between repetitive pressure measurements.
• Adequate venting of excess pressure and absence of leakage were confirmed.

Conclusions:

• The in-line syringe method is a reliable and cost-effective tool for monitoring endotracheal tube cuff pressure.
• This technique helps maintain safe cuff pressures, mitigating the risk of tracheal mucosal ischemia and injury.
• The method ensures proper cuff inflation and seals, enhancing patient safety during endotracheal intubation.