Ventilator-induced diaphragmatic dysfunction in extremely preterm infants: a pilot ultrasound study

Area of Science:

• Neonatal Medicine
• Respiratory Physiology
• Medical Imaging

Background:

• Mechanical ventilation in extremely preterm infants (EPI) can lead to diaphragm unloading and dysfunction.
• Diaphragmatic dysfunction is associated with prolonged ventilator dependence and adverse clinical outcomes.

Purpose of the Study:

• To investigate the development of diaphragmatic dysfunction in ventilated EPI using diaphragm ultrasound (DU).
• To assess changes in diaphragm thickness and thickening fraction within the first four days of life.

Main Methods:

• Prospective, observational study of 20 EPI (<28 weeks' gestational age) requiring mechanical ventilation.
• Daily diaphragm ultrasound (DU) measurements of end-inspiratory and end-expiratory diaphragm thickness.
• Calculation of diaphragm thickening fraction from baseline to day 4 of life.

Main Results:

• A significant reduction in end-inspiratory diaphragm thickness was observed from baseline to day 1 (P<0.001).
• Diaphragm thickening fraction significantly decreased from baseline to day 1 (P<0.001).
• No significant changes in thickness or thickening fraction were noted from day 1 to day 4.

Conclusions:

• This study provides the first evidence of diaphragmatic dysfunction in ventilated EPI.
• Ventilator-induced diaphragmatic dysfunction progresses rapidly within 24 hours of ventilation.
• Diaphragm ultrasound parameters are crucial indicators of respiratory status in ventilated EPI.