Patient-Ventilator Dyssynchrony in Critically Ill Patients

Area of Science:

• Critical Care Medicine
• Respiratory Therapy
• Mechanical Ventilation

Background:

• Patient-ventilator dyssynchrony (PVD) represents a critical mismatch between patient respiratory efforts and mechanical ventilator delivery.
• Dyssynchrony can manifest across all phases of the respiratory cycle, including trigger, flow, and cycling events.
• The presence and severity of PVD are linked to adverse patient outcomes, necessitating clinical attention.

Purpose of the Study:

• To define the various types of patient-ventilator dyssynchrony.
• To review the evidence linking PVD to patient outcomes.
• To discuss potential management strategies for identified dyssynchronies.

Main Methods:

• This review synthesizes existing literature on patient-ventilator dyssynchrony.
• It focuses on waveform analysis (airway pressure-time and flow-time) for dyssynchrony detection.
• Clinical assessment of patient comfort is also highlighted as a detection method.

Main Results:

• Different types of dyssynchrony exist, including trigger (e.g., ineffective efforts, autotriggering, double triggering), flow, and cycling (e.g., premature, delayed).
• Evidence supports a relationship between PVD and patient outcomes.
• Bedside detection is feasible through waveform interpretation and patient assessment.

Conclusions:

• Recognizing and addressing patient-ventilator dyssynchronies at the bedside is essential for improving patient care.
• Understanding the mechanisms and types of dyssynchrony guides management strategies.
• Waveform analysis and clinical assessment are key tools for managing PVD.