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Acute effects of PEEP on tidal volume and respiratory center output during synchronized ventilation in preterm

Ximena Alegría1, Nelson Claure, Yoshirou Wada

  • 1Department of Pediatrics, Division of Newborn Medicine, University of Miami Miller School of Medicine, Miami, Florida 33101, USA.

Pediatric Pulmonology
|June 17, 2006
PubMed

Insights

Increasing positive end expiratory pressure (PEEP) in preterm infants on mechanical ventilation can negatively impact lung mechanics and tidal volume. Respiratory center output does not sufficiently compensate for these acute effects, especially at lower respiratory drives.

Area of Science:

  • Neonatal physiology
  • Respiratory mechanics
  • Mechanical ventilation

Background:

  • Positive end expiratory pressure (PEEP) is standard for maintaining lung volume in ventilated preterm infants.
  • Acute increases in PEEP can alter lung mechanics and tidal volume.
  • The impact of PEEP changes on respiratory center output (RCO) in this population is not well understood.

Purpose of the Study:

  • To evaluate the acute effects of varying PEEP levels on tidal volume (V(T)), lung compliance (C(L)), and RCO.
  • To assess these effects during synchronized intermittent mandatory ventilation (SIMV) in preterm infants with differing basal respiratory drives.

Main Methods:

  • Preterm infants were studied under SIMV with PEEP levels of 2, 4, and 6 cm H(2)O.
  • Peak inspiratory pressure (PIP) was adjusted to maintain constant airway pressure changes.
  • Respiratory center output (RCO) was measured via diaphragmatic electrical activity, with inspired CO(2) adjusted to modulate respiratory drive.

Main Results:

  • Higher PEEP levels significantly reduced lung compliance (C(L)), tidal volume (V(T)), and minute ventilation (V'(E)).
  • Respiratory center output (RCO) did not show a significant change across PEEP levels.
  • A trend towards increased RCO was observed at lower respiratory drives with higher PEEP.

Conclusions:

  • Elevated PEEP levels can acutely impair lung mechanics and ventilation in preterm infants.
  • The respiratory center output does not adequately compensate for these negative effects.
  • Careful consideration of PEEP settings is necessary in this vulnerable population.
Abstract

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