Management of COPD Patient Not Maintaining Saturation on SIMV Mode

Immediate Assessment and Oxygen Escalation

The British Thoracic Society recommends verifying current SpO2 and confirming it is below the target range of 88-92% for COPD patients at risk of hypercapnic respiratory failure, and obtaining arterial blood gas immediately to assess for worsening hypercapnia and respiratory acidosis 1
The British Thoracic Society emphasizes that COPD patients should never target 94-98% without first confirming normal PaCO2 on blood gas analysis 2
Obtain arterial blood gas within 30-60 minutes to assess for worsening hypercapnia and respiratory acidosis, as any increase in FiO2 must be followed by repeat blood gases within 1 hour 1

Consider switching from SIMV to Adaptive Support Ventilation (ASV) as the preferred next step, although the provided text does not have a valid citation for this point, other points related to ASV are not included due to absence of valid citations

If SpO2 remains below 88% on current settings, increase FiO2 incrementally while monitoring for CO2 retention, starting with 5-10% increases in FiO2, rechecking blood gases after each adjustment 1 2
Do not use reservoir mask at 15 L/min targeting 94-98% saturation unless blood gas confirms normal PaCO2 and no history of hypercapnic respiratory failure 1 3

Seek immediate senior medical or ICU consultation if respiratory rate >30 breaths/min despite ventilator adjustments, or if there is a rising National Early Warning Score (NEWS) or track-and-trigger score 1 3 4
Prepare for NIV or invasive mechanical ventilation if blood gases reveal acute respiratory acidosis 1 2

Recheck arterial blood gas 30-60 minutes after any ventilator or oxygen change, as rising PaCO2 indicates ventilatory failure requiring immediate escalation 1 2
Monitor respiratory rate and heart rate continuously, as tachypnea and tachycardia are more sensitive indicators of physiologic distress than oxygen saturation alone 4

Do not rely on pulse oximetry alone, as it cannot detect hypercapnia, metabolic acidosis, or worsening respiratory acidosis, serial blood gases are mandatory 1 2 4