Because it is self-limited, a ______ is unlikely to result in abnormal blood pressure and quickly restores when the patient is placed in a horizontal position.

Because it is self-limited, a ______ is unlikely to result in abnormal blood pressure and quickly restores when the patient is placed in a horizontal position.

• A. Vasovagal Episode
• B. Hypoglycemia
• C. Anaphylactic Shock
• D. Cardiac Tamponade

Answer: (A)

When fainting is caused by a vasovagal response, the episode is usually self-limiting and tends to resolve quickly when the person is laid flat. The mechanism is a transient reflex that increases vagal tone and causes blood vessels to dilate, dropping heart rate and blood pressure for a short period. Placing the patient in a horizontal position stops gravitational pooling of blood in the legs and rapidly improves venous return to the heart, restoring cerebral blood flow and normalizing blood pressure. Because this process is temporary, most people recover quickly with the patient simply being monitored while lying down. Hypoglycemia can cause fainting or confusion, but its episode isn’t guaranteed to normalize with lying down and it requires addressing the low glucose. Anaphylactic shock involves widespread vasodilation and airway compromise, with blood pressure often remaining dangerously low despite positioning changes and requiring urgent treatment. Cardiac tamponade causes persistent low output and hypotension that do not quickly correct with lying flat; it needs medical intervention.

When fainting is caused by a vasovagal response, the episode is usually self-limiting and tends to resolve quickly when the person is laid flat. The mechanism is a transient reflex that increases vagal tone and causes blood vessels to dilate, dropping heart rate and blood pressure for a short period. Placing the patient in a horizontal position stops gravitational pooling of blood in the legs and rapidly improves venous return to the heart, restoring cerebral blood flow and normalizing blood pressure. Because this process is temporary, most people recover quickly with the patient simply being monitored while lying down.

Hypoglycemia can cause fainting or confusion, but its episode isn’t guaranteed to normalize with lying down and it requires addressing the low glucose. Anaphylactic shock involves widespread vasodilation and airway compromise, with blood pressure often remaining dangerously low despite positioning changes and requiring urgent treatment. Cardiac tamponade causes persistent low output and hypotension that do not quickly correct with lying flat; it needs medical intervention.