The Actual Role of CPET in Predicting Postoperative Morbidity and Mortality of Patients Undergoing Pneumonectomy

TL;DR

This study shows that predicted postoperative maximal oxygen consumption (ppo-VO2max) is a better predictor of post-surgery risks in lung cancer patients than pre-surgery oxygen consumption (VO2max).

Contribution

The study identifies ppoVO2max as a more reliable predictor of postoperative outcomes than VO2max in pneumonectomy patients.

Findings

A ppoVO2max threshold of 10 mL/kg/min was significantly associated with complications and mortality.

PpoVO2max was a better predictor of 90-day mortality than VO2max according to ROC analysis.

The 90-day mortality rate was 6.7% among patients undergoing pneumonectomy.

Abstract

This study aims to determine whether maximal oxygen consumption (VO2max) or predicted postoperative (ppo)-VO2max could still reliably predict postoperative complications and deaths in lung cancer patients undergoing pneumonectomy and which values could be more reliably considered as the optimal threshold. Methods: We retrospectively collected data of consecutive patients undergoing pneumonectomy for primary lung cancer at the European Oncological Institute (April 2019–April 2023). Routine preoperative assessment included cardiopulmonary exercise testing (CPET) and a lung perfusion scan. We evaluated the morbidity and mortality rates; associations between morbidity, mortality, VO2max, and ppoVO2max values were investigated through ANOVA or Fisher’s exact test as appropriate. Receiver operating characteristic (ROC) curves were applied to further explore the relation between VO2max, ppoVO2max values, and 90-day mortality. Results: The cardiopulmonary morbidity rate was 32.2%; the 30-day and 90-day mortality rates were 2.2% and 6.7%. The PpoVO2max values were significantly lower in patients experiencing cardiopulmonary complications or deaths compared to the whole cohort, whereas VO2max, though showing a trend towards lower values, did not reach statistical significance. A VO2max value threshold of 15 mL/kg/min correlated significantly with 90-day mortality, while a ppoVO2max cut-off of 10 mL/kg/min was significantly associated with cardiopulmonary complications and 30-day and 90-day mortality rates. ROC curve analysis revealed ppoVO2max as a better predictor of 90-day mortality compared to VO2max. Conclusions: CPET and a lung perfusion scan are two key elements for the preoperative evaluation of patients undergoing pneumonectomy, since it provides a holistic assessment of cardiopulmonary functionality. We recommend the routine calculation of ppoVO2max, particularly when adopting a 10 mL/kg/min threshold.

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