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Effect of residual leaning force on intrathoracic pressure during mechanical ventilation in children

Robert Michael Sutton1, Dana Niles, Jon Nysaether

  • 1The Children's Hospital of Philadelphia, Department of Anesthesia, Critical Care and Pediatrics, Philadelphia, PA 19104, USA. suttonr@email.chop.edur

Resuscitation
|April 23, 2010
PubMed

Insights

Residual leaning force significantly impacts intrathoracic pressure (ITP) in mechanically ventilated children. A force of 2.5kg caused a clinically important increase in peak endotracheal pressure, a surrogate for ITP.

Area of Science:

  • Pediatric Critical Care Medicine
  • Respiratory Physiology
  • Mechanical Ventilation

Background:

  • Intrathoracic pressure (ITP) management is crucial in mechanically ventilated children.
  • Residual leaning force, often encountered in patient positioning, may affect ITP.
  • Understanding this effect is vital for optimizing ventilation strategies.

Purpose of the Study:

  • To determine the impact of residual leaning force on ITP in healthy, mechanically ventilated children.
  • To test the hypothesis that significant residual leaning force (≥2.5kg or 20% body weight) alters ITP.
  • To establish a threshold for clinically significant changes in ITP.

Main Methods:

  • A pilot study involving healthy, anesthetized, paralyzed, and mechanically ventilated children (6 months to 7 years).
  • Peak endotracheal pressure (ETP), an ITP surrogate, was measured during incremental sternal force applications (10%-25% body weight).
  • A change in ETP ≥2.0 cmH2O was defined as clinically significant.

Main Results:

  • Thirteen children were enrolled (age: 26±24 months; weight: 13±5 kg).
  • Peak ETP increased with all tested force levels (p<0.01 for all).
  • A residual leaning force of ≥2.5kg correlated with a ≥2.0cmH2O increase in peak ETP (OR 7.5, p=0.014).

Conclusions:

  • Changes in ETP were detectable even at low residual leaning forces (10% body weight) in healthy anesthetized children.
  • A residual leaning force of 2.5kg was associated with clinically significant increases in ETP (≥2.0cmH2O).
  • These findings highlight the importance of considering leaning forces in pediatric mechanical ventilation.
Abstract

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