Ventilator Management

Trigger Settings

• Set flow triggers at 1-2 L/min or pressure triggers at -1 to -2 cmH2O in ACMV-VC and PC modes, and use more sensitive settings of 0.5-1 L/min or -0.5 to -1 cmH2O in spontaneous modes to reduce work of breathing and prevent patient-ventilator asynchrony, as recommended by the American Academy of Sleep Medicine 1
• Adjust trigger settings during CPR to prevent auto-triggering with chest compressions, as recommended by the American Heart Association 1
• Set respiratory rate backup at 2-4 breaths below patient's spontaneous rate (minimum 10 breaths/min) to prevent apnea, as suggested by the American Academy of Sleep Medicine 2
• Set inspiratory time at 30% of cycle time for obstructive disease and 40% for restrictive disease to allow adequate expiration, as recommended by the American Academy of Sleep Medicine 2
• Consider a backup rate of 6-8 breaths/min to prevent apnea during sleep, as suggested by the British Thoracic Society 3
• Avoid excessive oxygen flow rates (>4 L/min) to prevent delayed triggering and patient-ventilator asynchrony, as reported by the British Thoracic Society 4

Patient-Ventilator Interaction

• Observe patient-ventilator interaction and adjust trigger settings accordingly: increase sensitivity for ineffective triggering and decrease sensitivity for auto-triggering, as recommended by the American Thoracic Society 2
• Apply external PEEP up to 5 cmH2O for COPD patients with ineffective triggering, as suggested by the American College of Chest Physicians 2
• Adjust inspiratory time based on I:E ratio: 1:2.3 (30% IPAP time) for obstructive disease and 1:1.5 (40% IPAP time) for restrictive disease, as recommended by the American Academy of Sleep Medicine 2
• Start with E-sens at 25-30% of peak inspiratory flow for patients with obstructive disease and 35-40% for patients with restrictive disease, as recommended by the American Academy of Sleep Medicine and the ERS/ATS Task Force on Standards 2

Common Pitfalls

• Setting trigger too sensitive can cause auto-triggering, while setting trigger too insensitive can increase work of breathing and cause ineffective triggering, as warned by the American Thoracic Society and the British Thoracic Society 4
• Ignoring intrinsic PEEP can cause trigger asynchrony in COPD patients, as noted by the American College of Chest Physicians 2
• Trigger asynchrony can lead to prolonged mechanical ventilation, increased hospital length of stay, and lower weaning success rates, as reported by the American Thoracic Society 3
• Proper trigger settings are essential for reducing work of breathing, preventing patient-ventilator asynchrony, and optimizing ventilation outcomes, as recommended by the American Thorax Society 3

Ventilator Setup and Adjustment

• Use the following formulas to calculate inspiratory time for non-invasive positive pressure ventilation (NPPV):
• Adjust I-SENS settings to avoid auto-triggering and minimize work of breathing, with a moderate level of evidence supporting the use of flow triggers or pressure triggers, as recommended by the American Thorax Society 3, 2
• Start with a default I-SENS setting and adjust based on patient response, with lower numerical values indicating higher sensitivity, as recommended by the American Thorax Society 2, 3
• Optimize E-SENS settings to minimize total work of breathing, inspiratory work, and expiratory work, with a moderate level of evidence supporting the use of 25% of peak flow as the optimal setting, as suggested by the American Academy of Sleep Medicine 2