Evaluating the Impact of Chest Physiotherapy Technique Increasing Inspiratory Flow on Weaning From Non Invasive Ventilation (KVNI) Pilot Study

The treatment evaluated is the contribution of the chest physiotherapy technique of increasing the inspiratory flow (IIF) administered 3 times per day for a duration of 3 to 10 minutes according to the tolerance of the infant and interrupted if required by periods of rest. This technique utilises the exclusive nasal respiration and the increased thoracic compliance of the premature infant. The physiotherapy practiced engenders a progressive increase in the inspiratory flow until the physiological limits of the infant (expired volume and clinical tolerance). After having assured that the system is well in place, during the following inspiration we close the infant's mouth in a manner to add the following two simultaneous parameters of ventilation: forced inspiration and the PEP delivered by the ventilator. Regarding the Bi-phasic Positive Airway Pressure system of non invasive ventilation which is triggered by a movement captor placed on the skin of the lower thoracic cage, the physiotherapist will generate a first forced inspiration by following the respiratory rhythm of the infant. The infant will thus trigger the inspiratory aid of his machine simultaneously with the PEP delivered and the forced provoked inspiration.The respiratory rate of the infant can however be underestimated by the machine as it may not detect the ineffective respiratory efforts. The physiotherapy session shall be carried out by a physiotherapist of the service trained in this technique assisted by a nurse and the treatment shall start in the 24 hours following extubation/ weaning off form mechanical ventilation. The evaluation of clinical improvement will be done on a daily basis and the mode of non invasive respiratory support adapted accordingly. The objective of the project is to show that chest physiotherapy permits to decrease the duration of non invasive ventilation in the treatment group as compared to a control group without the above treatment ( this group will receive the usual care without the chest physiotherapy after extubation). Along with the expected diminution of the duration of non invasive respiratory support , we will also evaluate the efficiency of the IIF technique on the duration of oxygen dependence, the duration of hospitalisation of the premature infant on the special care unit, the proportion of infants diagnosed as having bronchopulmonary dysplasia at 36 weeks post menstrual age as established by the WALSH test as well as the presence of atelectasis on the chest X ray done within the 7 days following extubation. Eventual nociceptive effect will be evaluated by a pain score realised during the session.

This is a randomised controled therapeutic trial comparing two open parallel groups:

• A treatment group benefitting from the chest physiotherapy technique increasing inspiratory flow (IIF) 3 times per day along with the usual surveillance carried out under non invasive ventilation.
• A control group having the usual surveillance carried out under non invasive ventilation without any chest physiotherapy.

The research shall be carried out in one center. A draw to assign or not to the treatment group will be carried out by the physiotherapist present after having received the eligibility for the infant. The randomisation will be done by the physiotherapist with the aid of the electronic database CLEANWEB according to a list of pre established balanced randomisation ( size of the blocks not divulged to the investigators or the physiotherapists) after verification of the criteria of inclusion and information and explanation of the protocol to the parents.

Duration of inclusion: 24 months Duration of participation of each infant: 4 months maximum of treatment with follow up till discharge.