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Related Experiment Videos

Functional evaluation before lung resection.

Macé M Schuurmans1, Andreas H Diacon, Chris T Bolliger

  • 1Department of Internal Medicine, Lung Unit, University of Stellenbosch, Tygerberg Campus, Cape Town, South Africa.

Clinics in Chest Medicine
|March 21, 2002
PubMed
Summary
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Pulmonary resection risk is assessed using functional operability tests like exercise testing and split-function studies. These tests help determine patient safety for lung surgeries, with specific thresholds for parameters like VO2max and FEV1-ppo.

Area of Science:

  • Thoracic surgery
  • Pulmonary function testing
  • Cardiopulmonary exercise testing

Background:

  • Surgical techniques and perioperative care have significantly improved outcomes for pulmonary resections.
  • Assessing surgical risk is crucial for patient safety, with various functional operability parameters proposed.
  • Pulmonary function tests (PFTs) are essential but may overestimate functional loss post-resection.

Purpose of the Study:

  • To review and define parameters for assessing surgical risk in patients undergoing pulmonary resections.
  • To establish guidelines for utilizing exercise testing and split-function studies in pre-operative risk stratification.
  • To clarify the impact of different resection extents on long-term pulmonary function and exercise capacity.

Main Methods:

Related Experiment Videos

  • Review of established methods for assessing pulmonary and cardiovascular reserves, including cardiopulmonary exercise testing (CPET) and radionuclide-based split-function studies.
  • Analysis of proposed cutoff values for key parameters such as forced expiratory volume in 1 second (FEV1), diffusing capacity of the lungs for carbon monoxide (DLCO), and maximal oxygen consumption (VO2max).
  • Comparison of functional deficits and recovery patterns following different types of pulmonary resections, from lobectomy to pneumonectomy.

    • Main Results:

    • Patients with normal PFTs (FEV1 and DLCO ≥80% predicted) and no cardiovascular risk factors may tolerate pneumonectomy without further testing.
    • CPET-assessed VO2max thresholds: <10 mL/kg/min is prohibitive, >20 mL/kg/min or >75% predicted is safe for major resections.
    • Recommended split-function study cutoffs: FEV1-ppo and DLCO-ppo ≥40%, VO2max-ppo ≥35% with absolute VO2max ≥10 mL/kg/min.

    Conclusions:

    • Functional operability parameters, including CPET and split-function studies, are vital for optimizing surgical risk assessment in pulmonary resections.
    • Specific thresholds for VO2max, FEV1-ppo, and DLCO-ppo provide guidance for determining surgical candidacy.
    • While PFTs alone may overestimate loss, understanding the impact of resection extent is key to managing patient expectations and recovery.