Physiological effects of decannulation in tracheostomized patients

Area of Science:

• Respiratory Physiology
• Critical Care Medicine
• Pulmonary Rehabilitation

Background:

• Tracheostomized patients often require mechanical ventilation, impacting natural breathing patterns.
• Decannulation, the removal of a tracheostomy tube, alters airway anatomy and breathing mechanics.
• Understanding these physiological shifts is crucial for patient management and weaning from ventilation.

Purpose of the Study:

• To compare the physiological effects of mouth breathing (MB) versus tracheal breathing (TB) after decannulation in tracheostomized patients.
• To evaluate changes in breathing patterns, respiratory mechanics, and work of breathing.

Main Methods:

• A prospective cross-over study was conducted in a critical and neuromuscular care unit.
• Nine neuromuscular tracheostomized patients underwent measurements of airflow, pressures, gas exchange, and blood gases during both MB and TB.
• Physiological dead space, work of breathing, and oxygen uptake were analyzed.

Main Results:

• Mouth breathing (MB) increased tidal volume and physiological dead space significantly compared to tracheal breathing (TB).
• Work of breathing, transdiaphragmatic pressure swing, and diaphragmatic pressure-time product per minute increased by over 30% during MB.
• No significant differences were observed in respiratory frequency, inspiratory time, arterial CO2 pressure, total lung-airway resistance, or dynamic pulmonary compliance.

Conclusions:

• Decannulation leads to an increase in physiological dead space and significantly elevates the work of breathing.
• These respiratory changes associated with decannulation warrant special attention in patients with restrictive respiratory disease.
• The findings highlight the importance of assessing respiratory mechanics post-decannulation.