Initial Ventilator Settings for Mechanical Ventilation
Core Initial Settings
- The American Thoracic Society recommends using tidal volumes of 4-8 ml/kg predicted body weight (PBW) for adult patients requiring mechanical ventilation, with a plateau pressure <30 cmH2O 1, 3, 4
- The American Thoracic Society suggests calculating PBW using formulas: Males = 50 + 0.91[height (cm) - 152.4] kg and Females = 45.5 + 0.91[height (cm) - 152.4] kg 3
- The British Journal of Anaesthesia recommends maintaining plateau pressure <30 cmH2O and monitoring driving pressure (plateau pressure - PEEP) as it may be a better predictor of outcomes than tidal volume or plateau pressure alone 1, 3, 4, 5, 6
- The British Journal of Anaesthesia suggests starting with PEEP of 5 cmH2O (zero PEEP is not recommended) and setting initial FiO2 to 0.4 after intubation, then titrate to the lowest concentration to achieve SpO2 88-95% 4
Adjustments Based on Patient Condition
- For patients with ARDS, the American Thoracic Society recommends using lower tidal volumes (4-8 ml/kg PBW) with plateau pressure <30 cmH2O and considering higher PEEP strategy for moderate to severe ARDS (PaO2/FiO2 <200 mmHg) 1, 3
- For patients with obstructive disease, the British Journal of Anaesthesia suggests using tidal volumes of 6-8 ml/kg PBW and setting respiratory frequency at 10-15 breaths per minute 2, 7
- For patients with liver disease, the American Association for the Study of Liver Diseases recommends using lung protective ventilation with low tidal volumes (6 ml/kg PBW) and low plateau pressure (<30 cmH2O) 6, 8
Monitoring and Adjustments
- The British Journal of Anaesthesia recommends monitoring dynamic compliance, driving pressure, and plateau pressure in all mechanically ventilated patients and assessing for patient-ventilator synchrony 4, 7
- The British Journal of Anaesthesia suggests considering recruitment maneuvers when there is evidence of atelectasis, particularly during times when compliance changes rapidly 4
- The British Journal of Anaesthesia recommends adjusting ventilator settings based on changes in respiratory mechanics and gas exchange 4