[Evaluation of 2 techniques for ventilation support during single-lung ventilation].

Area of Science:

• Thoracic Surgery
• Anesthesiology
• Respiratory Physiology

Background:

• Single lung ventilation during thoracotomy requires careful management of gas exchange.
• The nondependent lung is at risk of collapse and hypoxemia.
• Ventilatory assistance techniques aim to improve oxygenation in the non-ventilated lung.

Purpose of the Study:

• To compare the efficacy of two ventilatory assistance techniques for the nondependent lung during thoracotomy.
• To evaluate the impact of continuous positive airway pressure (CPAP) applied to the whole nondependent lung versus the lower lobe of the nondependent lung on arterial oxygenation.

Main Methods:

• A comparative study involving 22 patients undergoing thoracotomy.
• Two CPAP techniques were applied to the nondependent lung during single lung ventilation: whole lung CPAP and lobar CPAP.
• Arterial blood gas measurements (PaO2) were used to assess oxygenation before and after each intervention.
• Statistical analysis using the student's t test compared mean PaO2 values.

Main Results:

• Both CPAP techniques significantly increased PaO2 during single lung ventilation.
• Whole lung CPAP resulted in a greater increase in PaO2 (from 85.86 to 155.52 mmHg) compared to lobar CPAP (from 88.75 to 122.36 mmHg).
• In direct within-patient comparisons, whole lung CPAP yielded higher PaO2 levels than lobar CPAP.

Conclusions:

• Both whole lung and lobar CPAP are effective in improving oxygenation during single lung ventilation in thoracotomy patients.
• CPAP applied to the entire nondependent lung demonstrates superior efficacy in enhancing arterial oxygen partial pressure.
• These findings support the use of whole lung CPAP as a primary method for ventilatory assistance in this context.