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Lung volume reduction surgery: preoperative functional predictors for postoperative outcome
E M Tschernko1, M Kritzinger, E M Gruber
1Department of Clinical Pharmacology, University of Vienna, Austria. Edda.Tschernko@univie.ac.at
Anesthesia and Analgesia
|January 23, 1999
Summary
Preoperative dynamic intrinsic positive end-expiratory pressure (PEEPi,dyn) can predict functional improvement after lung volume reduction surgery (LVRS). Patients with PEEPi,dyn ≥ 5 cm H2O showed better outcomes, aiding patient selection for LVRS.
Area of Science:
- Pulmonology
- Thoracic Surgery
- Respiratory Mechanics
Background:
- Lung volume reduction surgery (LVRS) is performed for severe emphysema.
- Approximately 20% of patients do not benefit functionally from LVRS.
- Predicting surgical outcomes is crucial for patient selection.
Purpose of the Study:
- To identify preoperative ventilatory mechanics that predict functional improvement after LVRS.
- To assess the utility of dynamic intrinsic positive end-expiratory pressure (PEEPi,dyn) as a predictor.
Main Methods:
- 32 patients undergoing LVRS had lung function, dyspnea, and ventilatory mechanics assessed preoperatively and 3 months postoperatively.
- Ventilatory mechanics included work of breathing (WOB), mean airway resistance (Rawm), and PEEPi,dyn.
- PEEPi,dyn was calculated from airflow, volume, and esophageal pressure measurements.
Main Results:
- Preoperative PEEPi,dyn strongly correlated with improvements in forced expiratory volume (r = 0.75) and reduced dyspnea (r = -0.74).
- Rawm and WOB showed weaker correlations.
- A PEEPi,dyn cutoff of ≥ 5 cm H2O demonstrated 93% sensitivity and 88% specificity for predicting improvement.
Conclusions:
- Preoperative PEEPi,dyn is a valuable predictor of functional outcomes following LVRS.
- This measurement can enhance risk-benefit stratification for patient selection.
- PEEPi,dyn shows promise for improving patient selection in LVRS procedures.