Ventilator Settings for Type 2 Respiratory Failure

Initial Assessment and Mode Selection

For patients with type 2 respiratory failure, the American Thoracic Society recommends using bilevel positive airway pressure (BiPAP) with settings tailored to achieve pH >7.20, PaCO2 normalization, and SpO2 88-92% 1, 2
BiPAP is the preferred ventilation mode for type 2 respiratory failure, while CPAP is more appropriate for hypoxemic respiratory failure, as suggested by the British Thoracic Society 1, 3
Non-invasive ventilation (NIV) should be started when pH <7.35, PaCO2 ≥6.5 kPa, and respiratory rate >23 breaths/min persists after one hour of optimal medical therapy, according to the European Respiratory Society 2
For patients with PaCO2 between 6.0-6.5 kPa, NIV should be considered but is not mandatory, as recommended by the American College of Chest Physicians 2

The initial IPAP (Inspiratory Positive Airway Pressure) setting should be 10-12 cmH2O, titrated up based on patient tolerance and response, as suggested by the International Journal of Infectious Diseases 1, 3
The initial EPAP (Expiratory Positive Airway Pressure) setting should be 5 cmH2O to overcome intrinsic PEEP and facilitate triggering, according to the Thorax journal 4, 5
The backup rate should be set to ensure minimum ventilation in patients with poor respiratory drive, as recommended by the International Journal of Infectious Diseases 3
FiO2 should be titrated to maintain target SpO2 of 88-92% in type 2 respiratory failure, as suggested by the Thorax journal 1, 4

Closely monitor the patient's condition within 1-2 hours after initiating NIV to prevent delay in intubation if needed, as recommended by the International Journal of Infectious Diseases 3, 7
Arterial blood gases should be checked at 1 hour and 4 hours after initiating ventilation, according to the Thorax journal 2
The target pH should be >7.20, with improvement in work of breathing, as suggested by the Thorax journal 2, 4

In patients with COPD, setting PEEP greater than intrinsic PEEP can be harmful, as warned by the Thorax journal 4, 5
Controlled oxygen therapy should be used to achieve a target saturation of 88-92% in all causes of acute hypoxemic respiratory failure, as recommended by the Thorax journal 4
Consider sedation carefully in invasively ventilated patients to avoid prolonged ventilation and ICU stay, as suggested by the Thorax journal 4, 5

Consider intubation if no improvement or worsening in clinical status within 1-2 hours of NIV, as recommended by the International Journal of Infectious Diseases 3, 7
Failure criteria include worsening respiratory acidosis, increasing oxygen requirements, decreased level of consciousness, and inability to clear secretions, as defined by the Thorax journal 8
Early intubation should be considered in patients with severe acidosis (pH <7.25) or severe hypoxemia despite NIV, as suggested by the International Journal of Infectious Diseases and the Thorax journal 1, 8

Delaying intubation when NIV is failing can increase mortality, as warned by the International Journal of Infectious Diseases 3, 7
Using excessive PEEP in obstructive diseases can worsen air trapping, as cautioned by the Thorax journal 4
Setting FiO2 too high (>96%) can worsen hypercapnia in type 2 respiratory failure, as warned by the International Journal of Infectious Diseases and the Thorax journal 1, 4
Inadequate monitoring of arterial blood gases can lead to missed opportunities for ventilator adjustments, as noted by the Thorax journal 2, 8