5 doctors weighed in:
What is the vasovagal syndrome?
5 doctors weighed in

Dr. Cynthia Thaik
Internal Medicine - Cardiology
4 doctors agree
In brief: Simple faint
Vasovagal syncope is the most common cause of a simple faint.
It is a neurocardiogenic response whereby a trigger ( ie blood draw, dentist drill) cause a surge of adrenaline causing a strong heart beat which feeds back on the vagus nerve that then leads to a chagall stimulation which cause dilatation of the blood vessel (lowers blood pressure) and slow heart rate.

In brief: Simple faint
Vasovagal syncope is the most common cause of a simple faint.
It is a neurocardiogenic response whereby a trigger ( ie blood draw, dentist drill) cause a surge of adrenaline causing a strong heart beat which feeds back on the vagus nerve that then leads to a chagall stimulation which cause dilatation of the blood vessel (lowers blood pressure) and slow heart rate.
Dr. Cynthia Thaik
Dr. Cynthia Thaik
Thank
Get help from a real doctor now
Dr. Eric Weisman
Board Certified, Neurology
32 years in practice
9M people helped
Continue
108,000 doctors available
Read more answers from doctors