[Monitoring respiratory and circulatory parameters in comparing various jet ventilation procedures]

Area of Science:

• Anesthesiology
• Respiratory Physiology
• Medical Engineering

Background:

• Endoscopic procedures often require airway management and ventilation.
• Different ventilation techniques can impact cardiorespiratory function.
• Monitoring cardiorespiratory parameters is crucial during ventilation.

Purpose of the Study:

• To compare cardiorespiratory function during different endoscopic ventilation methods.
• To evaluate the efficacy of injector-ventilation techniques versus conventional laryngoscopic ventilation.
• To assess physiological responses to various ventilation strategies.

Main Methods:

• Simultaneous, continuous monitoring of ECG, thoracic movement, tracheal pressure, pulmonary artery pressure, and transcutaneous arterial oxygen pressure.
• Intermittent measurements of arterial blood pressure and blood gas analysis (PaO2, PaCO2, BE, HCO3-, pH).
• Comparison of four injector-ventilation methods against conventional laryngoscopic ventilation.

Main Results:

• Laryngoscopic ventilation and Carden-Tubus injector-ventilation achieved hyperoxia with normofrequent ventilation.
• Venturi effect injector-ventilation sometimes failed to reach target capillary oxygen pressure due to lower oxygen proportion.
• Jet-ventilation with N2O/O2 mixture caused no significant hyperoxia but reduced systemic arterial blood pressure.
• All methods maintained intratracheal pressure within normal limits; jet trauma was indirectly indicated.

Conclusions:

• Different endoscopic ventilation methods yield distinct cardiorespiratory outcomes.
• Carden-Tubus injector-ventilation is effective for achieving hyperoxia.
• Venturi effect and N2O/O2 jet-ventilation have specific limitations and effects on blood pressure.
• Careful selection of ventilation technique is necessary to optimize oxygenation and minimize hemodynamic compromise.