Interaction Diaphragm and Cardiac Function During Ventilator Weaning
Palabras clave
Abstracto
Descripción
The study will take place in the Medical ICU of Pitié-Salpêtrière Hospital in Paris. The ICU have an established and successful clinical research program and infrastructure.
ICU patients will be enrolled if eligible (based on inclusion and non inclusion criteria) after their first spontaneous breathing trial failure.
Diaphragm function will be assessed by its capacity to generate a pressure with the phrenic nerves stimulation technique (reference method) and by ultrasonography (thickening fraction). Weaning induced pulmonary edema will be diagnosed with cardiac echo and markers of plasma contraction (plasma protein concentration).
Phrenic nerves stimulation, diaphragm and cardiac ultrasound will be repeated as part of the research before the spontaneous breathing trial.
After obtaining consent and before starting the second spontaneous breathing trial, clinical and biological will be collected. EKG and maximal inspiratory pressure will be done. Then, a diaphragm ultrasound and cardiac echo will be done and the phrenic nerves stimulation method will be undertaken. After these measurements, the spontaneous breathing trial will start. At the end of the spontaneous breathing trial (30 minutes with pressure support 7 cmH2O and 0 positive end expiratory pressure) or sooner in case of intolerance (respiratory distress), a new cardiac echo and diaphragm ultrasound will be performed as part of standard care before resuming the initial ventilator settings. As recommended by the usual medical practice, a second phrenic nerves stimulation will be eventually done after resuming the initial ventilator settings.
Diaphragm capacity to generate pressure :
Twitch airway pressure (Ptr, stim) will be measured during phrenic nerve stimulation. Phrenic nerve stimulation will be performed by bilateral anterior magnetic stimulation.
Cardiac echo :
Cardiac echo will be performed with a Philips Sparq ultrasound with a dedicated probe. The following variables will be obtained: left ventricular ejection fraction, E wave, A wave, E' wave, TAPSE
Diaphragm ultrasound :
Diaphragm thickening fraction will be measured by placing 13 MHz transducer on the right chest wall in the ninth intercostal space mid-way between the anterior and mid-axillary line and held perpendicular to the chest wall. Thickening fraction will be computed as the percentage change in thickness between end-expiration (i.e. minimum muscle thickness) and peak inspiration (i.e. maximal muscle thickness) visualized in M-mode.
fechas
| Verificado por última vez: | 08/31/2018 |
| Primero enviado: | 03/26/2018 |
| Inscripción estimada enviada: | 04/01/2018 |
| Publicado por primera vez: | 04/02/2018 |
| Última actualización enviada: | 09/04/2018 |
| Última actualización publicada: | 09/05/2018 |
| Fecha de inicio real del estudio: | 04/26/2018 |
| Fecha estimada de finalización primaria: | 10/29/2019 |
| Fecha estimada de finalización del estudio: | 10/29/2019 |
Condición o enfermedad
Intervención / tratamiento
Other: Patient difficult to wean
Fase
Grupos de brazos
| Brazo | Intervención / tratamiento |
|---|---|
| Experimental: Patient difficult to wean Repetition of medical examinations performed as part of the care. All patients will have a cardiac echo examination and diaphragm function assessment before the spontaneous breathing trial. | Other: Patient difficult to wean Cardiac echo, diaphragm ultrasound and phrenic nerves stimulation performed before the spontaneous breathing trial. |
Criterio de elegibilidad
| Edades elegibles para estudiar | 18 Years A 18 Years |
| Sexos elegibles para estudiar | All |
| Acepta voluntarios saludables | si |
| Criterios | Inclusion Criteria: 1. Patients adult (age ≥ 18 years) 2. Intubation and invasive mechanical ventilation longer than 48 hours; 3. Failure to the first spontaneous breathing trial; 4. Presence of weaning readiness criteria 5. Oral informed consent 6. Patient with affiliation to the french healthcare system Exclusion Criteria: 1. Pregnant women 2. Patient opposition 3. Contraindication to perform magnetic phrenic nerves stimulation technique (chest tube, cardiac pacemaker or implanted defibrillator, cervical implants, chest drains,...) 4. Impossibility to consider ventilator weaning (total ventilator dependence : preexisting neuromuscular disorders, cervical spine injury…) |
Salir
Medidas de resultado primarias
1. Failure at the spontaneous breathing trial [During or at the end of the spontaneous breathing trial]
Medidas de resultado secundarias
1. Rate of patients with diaphragm dysfunction [At the end of the patient participation (Day 3)]
2. Rate of patients with weaning induced pulmonary edema [At the end of the patient participation (Day 3)]
3. Rate of patients with diaphragm dysfunction and weaning induced pulmonary edema [At the end of the patient participation (Day 3)]
