One Lung Ventilation

Effect of One-Lung Ventilation on Respiratory Gas Heat Content

Specific Aims: 1) Measure exhalation enthalpy in patients receiving conventional positive pressure ventilation during stable hemodynamic conditions. 2) Measure exhalation enthalpy in patients following change from two-lung ventilation to one-lung ventilation while minute ventilation remains constant.

Inclusion Criteria:

• Scheduled for elective surgical procedures requiring one lung ventilation.

Exclusion Criteria:

• Age <18 years. Pregnancy. Prisoners. Planned pneumoperitoneum.