Panic values for pCO2 are at which values?

• A. 20 mmHg and 60 mmHg
• B. 25 and 75
• C. 15 and 65
• D. 30 and 70

Answer: (A)

Panic values for pCO2 are thresholds that flag immediate life-threatening ventilation problems. The normal arterial pCO2 range is about 35–45 mmHg. Values as extreme as 20 mmHg or 60 mmHg indicate dangerous disturbances in ventilation and require urgent clinical attention. A pCO2 of 20 mmHg reflects excessive ventilation, leading to respiratory alkalosis and potential cerebral effects from reduced CO2; a pCO2 of 60 mmHg reflects inadequate ventilation, causing respiratory acidosis with risks of hypoxemia and central nervous system depression. These values prompt rapid evaluation and intervention to support ventilation and identify the underlying cause.