What is the most important effect of vasovagal syncope?

What is the most important effect of vasovagal syncope?

• A. Bradycardia and low BP leading to possible loss of consciousness
• B. Tachycardia
• C. Hypertension
• D. Nausea only

Answer: (A)

Vasovagal syncope happens when a reflex causes the heart to slow and the blood vessels to dilate, reducing blood flow to the brain. The key consequence is bradycardia paired with a drop in blood pressure, which can briefly cut off cerebral perfusion and lead to fainting. That makes the main effect the combination of a slow heart rate and low blood pressure causing loss of consciousness. Tachycardia isn’t the defining response in this situation, and hypertension would oppose what this reflex produces. Nausea can occur as a warning sign, but it isn’t the central event driving the fainting.

Vasovagal syncope happens when a reflex causes the heart to slow and the blood vessels to dilate, reducing blood flow to the brain. The key consequence is bradycardia paired with a drop in blood pressure, which can briefly cut off cerebral perfusion and lead to fainting.

That makes the main effect the combination of a slow heart rate and low blood pressure causing loss of consciousness. Tachycardia isn’t the defining response in this situation, and hypertension would oppose what this reflex produces. Nausea can occur as a warning sign, but it isn’t the central event driving the fainting.