What high-pressure alarm setting would be appropriate when peak inspiratory pressure is around 26 cm H2O on VC-CMV?

• A. 18 cm H2O
• B. 28 cm H2O
• C. 44 cm H2O
• D. 36 cm H2O

Answer: (D)

High-pressure alarm limits should sit above the expected peak inspiratory pressure to avoid nuisance alarms but still catch real trouble early. If the peak inspiratory pressure is about 26 cm H2O on VC-CMV, a common safety margin is around 10 cm H2O above that value, giving a high-pressure alarm set near 36 cm H2O. This provides a cushion for normal fluctuations (coughing, transient airway resistance changes, minor leaks) while still signaling when pressures rise due to obstruction, secretions, bronchospasm, tubing kink, or decreased compliance. Setting it too low (like well below 26) would cause alarms during normal breaths; setting it too high (like 44) could delay detection of dangerous pressure increases. Therefore, 36 cm H2O appropriately balances sensitivity and safety.