Immediate post-operative effects of tracheotomy on respiratory function during mechanical ventilation

Area of Science:

• Critical Care Medicine
• Respiratory Physiology
• Pulmonary Engineering

Background:

• Tracheotomy is a common procedure in intensive care units (ICUs) for patients requiring prolonged mechanical ventilation.
• Understanding the immediate effects of tracheotomy on respiratory mechanics is crucial for optimizing patient care.

Purpose of the Study:

• To investigate the immediate influence of tracheotomy on respiratory system mechanics and arterial blood gases in orally intubated patients.
• To assess changes in respiratory system elastance (Ers), resistance (Rrs), and other mechanical parameters post-tracheotomy.

Main Methods:

• Tracheotomy was performed on 32 orally intubated patients.
• Respiratory parameters (airway pressure, flow) and arterial blood gases were measured before and 30 minutes after tracheotomy.
• Respiratory system elastance, resistance, reactance, impedance, and phase angle were calculated.

Main Results:

• A significant increase in respiratory system elastance (Ers) was observed immediately after tracheotomy (7%).
• Significant decreases were noted in respiratory resistance (Rrs, -16%), reactance (Xrs, -6%), and phase angle (phi rs, -14.3%).
• End-expiratory pressure (EEP), impedance (Zrs), blood gases, and pH showed no significant changes.

Conclusions:

• Tracheotomy leads to immediate changes in respiratory mechanics, specifically lower resistance and higher elastance.
• The overall impact on respiratory impedance and function effectiveness was not significant in the immediate post-procedure period.
• Factors such as anesthesia or increased fraction of inspired oxygen (FiO2) may contribute to the observed increase in elastance.