Please select the eligibility criteria that correspond to the clinical trial below.
Title: Effect of Prone Positioning on Mortality in Patients With Severe and Persistent Acute Respiratory Distress Syndrome
Brief Summary: We project to test the effect of prone position on mortality in severe ARDS patients (PaO2/FiO2\<150 with FiO2 \> or = 0.6 and positive end-expiratory pressure \> or = 5 cmH2O). Ventilator will be set in accordance with current standards aiming at protecting the lungs from VALI. Patients will be randomized into two arms: prone group in which proning will be realized for at least 16 hours a day and supine group in which patients will stay in a semi-recumbent position. Primary end-point is 28-day mortality of all causes. Secondary end-points are 90-day mortality of all causes and incidence of ventilator-acquired pneumonia. Study sample was calculated to detect ability of proning to reduce mortality from 60 to 45% percent, at one-tailed alpha error of 5% and power of 90% and 230 patients are needed in each arm.


Options:
A: Inclusion Criteria:

1. Age ≥ 18 years
2. Patients expected to be oro-tracheally intubated for at least 48 hours or longer
3. Enrollment time window within 12 hours following intubation

Exclusion Criteria:

1. Current and past participation in an other intervention trial conflicting with the present study
2. Previous endotracheal intubation longer than 12 hours during the previous 30 days
3. Patients with documented bronchiectasis
4. Cystic fibrosis
5. Witnessed pulmonary aspiration either prior or at intubation
6. Patients with increased intracranial pressure, brain edema; or medical conditions that can worsen with increase in intracranial pressure
7. Patients with significant heart failure and activity impairment (Class III-IV of the New York Heart Association (NYHA)
8. Spinal cord injury
9. BMI \> 35, or weight above 300 pound
10. Grade IV Intra-abdominal pressure: IAP \> 25 mmHg or abdominal compartment syndrome , defined as a sustained IAP \> 20 mmHg that is associated with new organ dysfunction / failure
11. Pregnancy
12. Orthopedic problems that will not allow the patient to be kept in one of the study positions
B: Inclusion Criteria:

1. Adult patients aged 18 years or more, both gender
2. Receiving endotracheal intubation and mechanical ventilation for less than 36 hours
3. Presenting with a Severe ARDS :

   * Acute onset
   * PaO2/FiO2 ≤ 200 (≤ 26.7 kPa)
   * Bilateral pulmonary infiltrates on frontal chest radiography
   * Capillary wedge pressure \< 18 mm Hg if measured or no evidence for left atrial hypertension
4. During since 12-24 hours
5. AND with severity criteria : PaO2/FiO2 \< 150 mm Hg (\< 20 kPa) under FiO2 ≥ 0.6, PEEP ≥ 5 cm H2O and a tidal volume equal to 6 ml/kg PBW.
6. Written consent from patient's next of kin

Exclusion Criteria:

1. contra-indication to the prone position

   * Intracranial pressure \> 30 mm Hg or cerebral perfusion pressure \< 60 mm Hg
   * Massive haemoptysis needing urgent surgical or radiological treatment
   * Tracheal or thoracic surgery in the last 15 days
   * Facial trauma or surgery in the last 15 days
   * Deep venous thrombosis or pulmonary embolism treated in the last 2 days
   * Cardiac pace maker implantation in the last 2 days
   * Unstable bone dislocations of rachis, femur, rib cage, pelvis
   * Mean systolic arterial pressure less than 70 mm Hg despite vasopressive therapy
   * Pregnancy
   * Bronchopleural fistula treated with a single anterior chest tube (risk of kinking in prone position)
2. Exclusion criteria for respiratory raisons

   * Necessity to use NOi or almitrine
   * Extra body circulation for oxygenation and/or CO2 epuration
3. Exclusion criteria linked to clinical context

   * Pulmonary transplantation
   * Burns ≥ 20% of body surface
   * Chronic respiratory insufficiency under home oxygen therapy or non invasive ventilation
   * Chronic disease supposed to be fatal in less than 1 year
   * Non invasive ventilation for more than 24 hours before enrollment
4. Other exclusion criteria

   * Decision to stop life-supportive therapies before enrollment
   * Enrollment in an other trial testing an intervention and with mortality as primary end point in the last 30 days
   * Prior enrollment in the same study
   * Prone position before enrollment
C: Inclusion Criteria:

* ARDS patient
* mechanically ventilated in prone position
* sedated and paralyzed
* with continuous cardiac output monitoring by transpulmonary thermodilution and pulse contour analysis
* fluid loading as indicated by attending physician

Exclusion Criteria:

* Age below 18
* no affiliation to social security
* Vena cava obstruction
* previous inclusion in protocol
D: Inclusion Criteria:

* Children undergoing general anesthesia with prone position
* Endotracheal intubation and mechanical ventilation during general anesthesia
* Operation time is more than 2 hours

Exclusion Criteria:

* Previous lung surgery
* Any abnormal findings such as atelectasis, pneumothorax, pleural effusion, or pneumonia on preoperative chest X-ray
* Researchers judge (to be inappropriate)

Answer: B