Why must excessive ventilation be avoided when providing bag-mask ventilation to a person who has overdosed?

Excessive ventilation must be avoided during bag-mask ventilation for a person who has overdosed primarily because it can cause airway obstruction due to stomach inflation. When too much air is delivered too quickly, it increases the pressure within the abdominal cavity, potentially leading to the inflation of the stomach. This inflation can push against the diaphragm, making it more difficult for the lungs to expand and reducing the effectiveness of breathing. In addition, it may also increase the risk of aspiration, where stomach contents can enter the airway, further complicating the patient's condition. This is crucial in a situation involving overdose, where maintaining a clear airway is vital for effective ventilation and overall patient care.

While the other options point to valid concerns associated with incorrect ventilation technique, the most immediate and direct consequence of excessive ventilation in this scenario relates to airway obstruction caused by stomach inflation.