Too little CO2 can decrease the casualty's drive to breathe.

Too little CO2 can decrease the casualty's drive to breathe.

• A. True
• B. False
• C. It increases drive
• D. No effect

Answer: (A)

CO2 is the primary signal our body uses to regulate breathing. The central chemoreceptors in the brain detect the hydrogen ion concentration in the CSF, which reflects CO2 levels in the blood. When CO2 is present at normal levels, breathing is driven to keep those levels balanced. If CO2 falls too low, the chemical signal to breathe weakens, reducing the respiratory drive. That means a casualty with hypocapnia may breathe more slowly or shallowly, or even stop breathing if CO2 remains suppressed. This is why overventilation can blunt the drive to breathe. So the statement is true: too little CO2 can decrease the casualty's drive to breathe.

CO2 is the primary signal our body uses to regulate breathing. The central chemoreceptors in the brain detect the hydrogen ion concentration in the CSF, which reflects CO2 levels in the blood. When CO2 is present at normal levels, breathing is driven to keep those levels balanced. If CO2 falls too low, the chemical signal to breathe weakens, reducing the respiratory drive. That means a casualty with hypocapnia may breathe more slowly or shallowly, or even stop breathing if CO2 remains suppressed. This is why overventilation can blunt the drive to breathe. So the statement is true: too little CO2 can decrease the casualty's drive to breathe.