Changes in tracheal tube position during laparoscopic cholecystectomy

Area of Science:

• Anesthesiology
• Surgical Safety
• Respiratory Mechanics

Background:

• Accurate tracheal tube placement is critical for patient safety during general anesthesia.
• Laparoscopic procedures, particularly cholecystectomy, involve significant physiological changes that can affect airway management.
• The Eschmann tracheal tube's intubation guide mark has been used to aid placement, but its reliability requires evaluation.

Purpose of the Study:

• To assess the distance between the carina and the tip of the tracheal tube during laparoscopic cholecystectomy.
• To evaluate the effect of pneumoperitoneum and patient positioning on tracheal tube migration.
• To determine the risk of bronchial intubation if initial tube placement relies solely on the vocal cord guide mark.

Main Methods:

• Fibreoptic bronchoscopy was used to measure tracheal tube-to-carina distance in 21 patients.
• Measurements were taken after initial tube placement, after repositioning, and after pneumoperitoneum creation.
• Tracheal tube migration was assessed during changes in patient position (reverse Trendelenburg and left lateral tilt).

Main Results:

• Initial tracheal tube placement using the vocal cord guide mark resulted in a mean distance of 28 mm to the carina.
• Repositioning the tube to a mean distance of 34 mm before pneumoperitoneum was performed.
• Pneumoperitoneum significantly decreased the tube-to-carina distance to a mean of 26 mm, with a maximum migration of 8 mm.
• Without repositioning, 4 out of 21 patients were at risk of bronchial intubation.

Conclusions:

• Initial placement of tracheal tubes using the vocal cord guide mark is unreliable for laparoscopic cholecystectomy.
• Pneumoperitoneum causes significant cephalad migration of the tracheal tube.
• Tracheal tube repositioning is essential to prevent bronchial intubation in patients undergoing laparoscopic cholecystectomy.