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Patient-ventilator asynchrony during assisted mechanical ventilation.

Arnaud W Thille1, Pablo Rodriguez, Belen Cabello

  • 1Université Paris XII, INSERM U651, Réanimation Médicale, AP-HP Hôpital Henri Mondor, Faculté de Médecine, 51 avenue du Maréchal de Lattre de Tassigny, 94000 Créteil, France. arnaud.thille@wanadoo.fr

Intensive Care Medicine
|August 10, 2006
PubMed
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Patient-ventilator asynchrony affects 24% of patients on assisted mechanical ventilation, often leading to longer ventilator use. Ineffective triggering may indicate excessive ventilatory support.

Area of Science:

  • Critical Care Medicine
  • Respiratory Physiology
  • Mechanical Ventilation

Background:

  • Patient-ventilator asynchrony (PVA) is a common complication during mechanical ventilation.
  • The incidence, underlying mechanisms, and clinical impact of PVA remain incompletely understood.

Purpose of the Study:

  • To determine the incidence of PVA during assisted mechanical ventilation.
  • To identify factors associated with PVA.

Main Methods:

  • Prospective study of 62 patients requiring mechanical ventilation >24 hours.
  • Assessed PVA using an asynchrony index derived from flow and airway pressure recordings.
  • Patients received either assist-control ventilation (ACV) or pressure-support ventilation (PSV).

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Main Results:

  • 24% of patients exhibited a high incidence of PVA (asynchrony index >10%).
  • Ineffective triggering and double-triggering were the primary asynchrony patterns.
  • High PVA incidence correlated with longer mechanical ventilation duration and potentially excessive ventilatory support.

Conclusions:

  • A significant proportion of patients experience substantial PVA during assisted ventilation.
  • PVA is linked to prolonged mechanical ventilation duration.
  • Frequent ineffective triggering may signal overly aggressive ventilatory settings.