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Author Spotlight: Unraveling the Impact of Mechanical Ventilation on Diaphragm Function and Patient Outcomes
Published on: November 3, 2023
Evaluation of diaphragmatic function in mechanically ventilated children: An ultrasound study
En-Pei Lee1,2, Shao-Hsuan Hsia1,2, Hsiu-Feng Hsiao3
1Division of Pediatric Critical Care Medicine, Department of Pediatrics, Chang Gung Memorial Hospital at Linkou, Taoyuan, Taiwan.
Insights
Mechanically ventilated children develop diaphragm atrophy and dysfunction within 24 hours. Diaphragmatic thickening fraction (DTF) predicts successful extubation, making ultrasound a valuable tool.
Area of Science:
- Pediatric critical care medicine
- Respiratory physiology
- Medical imaging
Background:
- Diaphragmatic function is crucial for weaning patients off mechanical ventilation.
- Ultrasound has identified diaphragm atrophy in ventilated adults, but not yet in children.
- This study investigates diaphragm atrophy and dysfunction in pediatric patients.
Purpose of the Study:
- To assess diaphragm atrophy and dysfunction in mechanically ventilated children.
- To evaluate the utility of diaphragm ultrasound in this population.
- To determine if diaphragmatic function predicts extubation success.
Main Methods:
- Prospective case-control study of pediatric intensive care unit patients requiring mechanical ventilation.
- Daily diaphragm ultrasound assessments measuring thickness and diaphragmatic thickening fraction (DTF).
- Evaluations conducted from intubation until discharge from the ICU.
Main Results:
- 31 pediatric patients were enrolled, with 1389 ultrasound assessments performed.
- Initial diaphragm thickness and DTF were measured post-intubation.
- Significant decreases in diaphragm thickness and DTF were observed within 24 hours of ventilation, with gradual further decline.
- A DTF <17% was associated with extubation failure, and DTF differed significantly between successful and failed extubation groups.
Conclusions:
- Diaphragm ultrasound is a noninvasive method for assessing diaphragmatic function in ventilated children.
- Significant diaphragm atrophy and reduced DTF occur within 24 hours of mechanical ventilation.
- Diaphragm thickness and DTF recovery may predict successful extubation.
Background:
The recovery of diaphragmatic function is vital for successful extubation from mechanical ventilation. Recent studies have detected diaphragm atrophy in ventilated adults by using ultrasound, but no similar report has been conducted in children. In the current study, we hypothesized that mechanically ventilated children may also develop diaphragm atrophy and diaphragmatic dysfunction.
Materials And Methods:
Children who were admitted to the pediatric intensive care unit and were newly intubated for mechanical ventilation were enrolled into this prospective case-control study. Diaphragm ultrasound assessments were performed daily to evaluate diaphragmatic function in the enrolled children until their discharge from the pediatric intensive care unit. Diaphragm thickness and the diaphragmatic thickening fraction (DTF) were measured through these assessments.
Results:
A total of 31 patients were enrolled, and overall, 1389 ultrasound assessments were performed. Immediately after intubation, the initial diaphragm thickness and DTF were measured to be 1.94 ± 0.44 mm and 25.85% ± 3.29%, respectively. In the first 24 hours of mechanical ventilation, diaphragm thickness and the DTF decreased substantially and decreased gradually thereafter. After extubation, the DTF was significantly different between the successful and failed extubation groups (P < 0.001), and a DTF value of <17% was associated with extubation failure.
Conclusions:
Diaphragm ultrasound is a noninvasive method for measuring diaphragmatic function in mechanically ventilated children. In this study, significant diaphragm atrophy and a decreased DTF were observed within 24 hours of mechanical ventilation. The recovery of diaphragm thickness and the DTF may be a potential predictor of successful extubation from mechanical ventilation.
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