Assessment of Salbutamol Effect on Arterial Oxygenation in COPD Patients During One-lung Ventilation
Overview
- Phase
- Not Applicable
- Intervention
- 5ml of inhaled normal saline
- Conditions
- One-lung Ventilation
- Sponsor
- Yonsei University
- Enrollment
- 90
- Locations
- 1
- Primary Endpoint
- PaO2 (partial pressure of arterial oxygen) to FiO2 (fraction of inspired oxygen) ratio (P/F ratio)
- Status
- Active, not recruiting
- Last Updated
- 10 months ago
Overview
Brief Summary
One-lung ventilation (OLV) is essential part of anesthesia during thoracic procedures. However, OLV induces a drastic increase of intrapulmonary shunt due to maintained pulmonary perfusion through the nonventilated lung, which may result in severe hypoxemia. Although the protective mechanisms of hypoxic pulmonary vasoconstriction favorably modulate pulmonary perfusion to the ventilated lung, the effect is attenuated in patients with history of chronic obstructive pulmonary disease (COPD), which alters compliance of the pulmonary artery.
Salbutamol is a selective short-acting beta2-agonist and when inhaled during OLV, it acts selectively on the pulmonary vasculature reducing pulmonary vascular resistance of well-ventilated lung. We hypothesized that inhaled salbutamol would alleviate ventilation-perfusion mismatch during OLV of COPD patients, and aimed to assess the effects of salbutamol on oxygenation in these patients.
Investigators
Eligibility Criteria
Inclusion Criteria
- •Patient age 40\~80yrs, scheduled for videoscope-assisted pulmonary lobectomy
- •American Society of Anesthesiologists Class III 또는 IV
- •Moderate or more severe COPD according to GOLD criteria (FEV1/FVC\<70%, FEV1\<80%)
Exclusion Criteria
- •New York Heart Association class \>II
- •AST level ≥100 IU/mL or ALT ≥ level 50 IU/L
- •Creatinine clearance \< 30mL/min
- •History of severe coronary artery occlusive disease, unstable angina, or recent myocardial infarction within 6 months
- •History of pulmonary hypertension or pulmonary edema
- •History of cerebrovascular accident within 3 months
Arms & Interventions
Control group
Normal saline
Intervention: 5ml of inhaled normal saline
Salbutamol group
Salbutamol + normal saline
Intervention: 2.5mg (2.5ml) of inhaled salbutamol and 2.5ml of inhaled normal saline
Outcomes
Primary Outcomes
PaO2 (partial pressure of arterial oxygen) to FiO2 (fraction of inspired oxygen) ratio (P/F ratio)
Time Frame: Thirty minutes after the completion of drug inhalation
The P/F ratio is a widely-used objective tool to identify hypoxemic respiratory failure when supplemental oxygen has been administered. It can be used to evaluate the effect of salbutamol on oxygenation during OLV.