Respiratory Muscles and Work of Breathing in Children

This study measures how hard children with respiratory muscle problems have to work to breathe. Researchers at Necker Hospital study children who breathe on their own or with ventilator support to better understand their breathing mechanics and improve care. You may be eligible if: - Your child is under 18 years old - Your child has been diagnosed with primary or secondary respiratory muscle impairment and is followed at Necker Hospital - Your child breathes spontaneously or uses non-invasive or invasive mechanical ventilation - Written informed consent has been obtained You may NOT be eligible if: - Your child does not have social insurance coverage - Your child has significant cognitive or motor developmental delays that would prevent cooperation - Your child is severely agitated or hemodynamically unstable - Your child has an acute illness or is on medications that could interfere with the breathing measurements Talk to your doctor to see if this trial is right for you.