Pressure Support Settings for COPD Patients with Type 2 Respiratory Failure

Introduction to BiPAP Settings

The American Thoracic Society recommends using bilevel positive airway pressure (BiPAP) rather than CPAP alone for COPD patients with type 2 respiratory failure, starting with IPAP 10-12 cmH₂O and EPAP 4-5 cmH₂O, as CPAP is primarily indicated for hypoxemic respiratory failure and does not provide the ventilatory support needed to reduce PaCO₂ in hypercapnic patients 1, 2, 3

The European Respiratory Society suggests that CPAP alone is insufficient for type 2 respiratory failure because it does not provide pressure support to augment tidal volume and reduce work of breathing 1, 2
BiPAP combines inspiratory pressure support (IPAP) with expiratory pressure (EPAP), where the difference between these two pressures provides the ventilatory assistance needed to improve alveolar ventilation and reduce PaCO₂, as recommended by the British Thoracic Society 2, 4

The American College of Chest Physicians recommends starting with IPAP: 10-12 cmH₂O (can start at 8-10 cmH₂O if patient is very frail or intolerant) 5, 3
The European Society of Intensive Care Medicine suggests starting with EPAP: 4-5 cmH₂O to counteract intrinsic PEEP and facilitate triggering 4, 3
The American Thoracic Society recommends a backup rate: 12-15 breaths/min in spontaneous-timed (S/T) mode to ensure minimum ventilation if respiratory drive is poor 2, 6, 3
The Society of Critical Care Medicine recommends an inspiratory time: 1.2-1.6 seconds (corresponding to 30-40% of respiratory cycle at rate of 15 breaths/min) 6
The American Academy of Sleep Medicine suggests titrating supplemental oxygen to SpO₂ 88-92% (not higher, to avoid worsening hypercapnia) 3

The American College of Physicians recommends increasing IPAP by 2 cmH₂O every 5-15 minutes if pH remains <7.35 or is worsening, PaCO₂ is not improving, respiratory rate remains >25-30 breaths/min, or patient continues to show signs of respiratory distress 5, 3
The European Respiratory Society suggests that the target IPAP is typically 14-20 cmH₂O for most COPD patients with acute hypercapnic respiratory failure 3

The American Thoracic Society recommends checking arterial blood gases at 1 hour and 4 hours after initiating BiPAP, with target parameters including pH >7.25-7.30, improving or stable PaCO₂, SpO₂ 88-92%, respiratory rate <25 breaths/min, and improved work of breathing and patient comfort 3
The Society of Critical Care Medicine suggests that within 1-2 hours, the patient should show clinical improvement, and if there is no improvement or worsening, prepare for intubation 3

The American College of Chest Physicians recommends avoiding CPAP alone for type 2 respiratory failure, as it will not provide adequate ventilatory support to reduce PaCO₂ 1, 2, 3
The European Society of Intensive Care Medicine suggests avoiding excessive EPAP, as setting EPAP greater than intrinsic PEEP can worsen air trapping and increase work of breathing in COPD patients 3
The American Thoracic Society recommends not targeting SpO₂ >94%, as excessive oxygen administration in type 2 respiratory failure can suppress respiratory drive and worsen hypercapnia, and instead targeting 88-92% 3
The American Academy of Sleep Medicine suggests not delaying intubation if BiPAP is failing, as delayed intubation increases mortality 3

The American College of Physicians recommends using spontaneous-timed (S/T) mode rather than spontaneous mode alone to provide backup breaths if the patient's respiratory drive is inadequate 2, 4, 6