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Expiratory Flow Limitation During Mechanical Ventilation
Detajin Junhasavasdikul1, Irene Telias2, Domenico Luca Grieco3
1Interdepartmental Division of Critical Care Medicine, University of Toronto, Toronto, ON, Canada; Keenan Research Centre, Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, ON, Canada; Department of Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.
Chest
|February 13, 2018
Summary
Expiratory flow limitation (EFL) is often unrecognized in mechanically ventilated patients. Early detection of EFL is crucial for managing complications and improving patient outcomes.
Area of Science:
- Pulmonary Medicine
- Critical Care Medicine
- Respiratory Physiology
Background:
- Expiratory flow limitation (EFL) occurs when airflow does not increase with increased expiratory pressure, often due to small airway collapsibility.
- In mechanically ventilated patients, EFL can lead to intrinsic positive end-expiratory pressure (PEEP), dyspnea, and patient-ventilator dyssynchrony.
- Conditions like COPD, obesity, heart failure, and ARDS are frequently associated with EFL, particularly at low PEEP levels.
Purpose of the Study:
- To review and summarize methods for detecting Expiratory Flow Limitation (EFL) in mechanically ventilated patients.
- To highlight the clinical significance and underdiagnosis of EFL.
- To emphasize the potential impact of recognizing EFL on patient management and outcomes.
Main Methods:
- This review summarizes various techniques and indicators used to identify EFL during mechanical ventilation.
- The focus is on practical methods applicable in a clinical setting.
- Discussion includes how EFL manifests during tidal ventilation.
Main Results:
- EFL is frequently underrecognized in clinical practice despite its association with adverse outcomes.
- Underlying mechanisms of EFL, including airway collapsibility, are still debated.
- EFL contributes to complications such as postoperative pulmonary issues, extubation failure, and potential airway injury in ARDS.
Conclusions:
- Prompt recognition and management of EFL in mechanically ventilated patients are essential.
- Implementing specific detection methods can improve patient care and potentially alter outcomes.
- Further research into EFL mechanisms and optimal management strategies is warranted.
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