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Mechanical power is associated with weaning outcome in critically ill mechanically ventilated patients

Yao Yan1,2, Yongpeng Xie1, Xiaobing Chen1

  • 1Department of Emergency Medicine, Lianyungang Clinical College of Nanjing Medical University, The First People's Hospital of Lianyungang City, Lianyungang, 222000, Jiangsu, China.

Scientific Reports
|November 17, 2022
PubMed

Insights

Mechanical power (MP) predicts weaning outcomes in patients on invasive mechanical ventilation (IMV). Normalized MP, specifically Cdyn-MP and PBW-MP, demonstrated superior predictive ability for weaning failure compared to unnormalized MP.

Area of Science:

  • Critical Care Medicine
  • Respiratory Physiology
  • Mechanical Ventilation

Background:

  • Prolonged invasive mechanical ventilation (IMV) poses challenges for patient recovery.
  • Mechanical Power (MP) is a potential predictor of weaning outcomes, but its broad applicability requires further study.
  • Previous research on MP and weaning outcomes has been limited to single-center studies.

Purpose of the Study:

  • To investigate the correlation between mechanical power (MP) and weaning outcomes in a large cohort of IMV patients.
  • To evaluate the predictive performance of MP, Cdyn-MP, and PBW-MP for weaning failure.
  • To determine if normalized MP metrics offer improved prediction compared to standard MP.

Main Methods:

  • Retrospective analysis of patients with IMV >24 hours from the MIMIC-IV database.
  • Logistic regression and subgroup analysis to assess the association between MP and weaning outcomes.
  • Receiver Operating Characteristic (ROC) curve analysis to compare the discriminative ability of MP, Cdyn-MP, and PBW-MP.

Main Results:

  • Higher levels of MP were significantly associated with increased odds of weaning failure.
  • Cdyn-MP and PBW-MP demonstrated higher predictive accuracy (AUROC 0.760 and 0.761, respectively) than MP (AUROC 0.745).
  • Adjusted analysis confirmed MP as an independent predictor of weaning failure risk.

Conclusions:

  • Mechanical Power (MP) is a significant predictor of weaning outcomes in patients requiring prolonged invasive mechanical ventilation.
  • Normalized MP metrics, Cdyn-MP and PBW-MP, exhibit superior discriminative ability for predicting weaning failure compared to standard MP.
  • These findings support the use of normalized MP in clinical practice to identify patients at higher risk of weaning failure.

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