Is it recommended to depress the manual vent when suction is not connected or not operating?

• A. Yes
• B. No
• C. Only if trained
• D. Only briefly

Answer: (B)

In this setup, preserving a closed, controlled drainage system is essential. The manual vent is part of the suction control that allows air to escape when suction is active. If suction is not connected or not operating, depressing the vent creates a direct opening to the atmosphere. Without suction to pull air through, opening the vent can let room air enter the drainage line and potentially the pleural space, increasing the risk of a pneumothorax or compromising drainage. Therefore, the vent should not be depressed when suction is unavailable. If suction isn’t connected or isn’t working, check the system for disconnections, kinks, or faults and restore suction before making any vent adjustments.