afib and vasovagal syncope



My son, age 35,in excellent health, recently fainted and hit his head
badly. He went to the ER and also was found to be in Afib, 1st time. The
afib self converted the next day. A month of monitoring has yielded no
anomalies. A few weeks later he had a Tilt Table test and was found to have
VasoVagal syncope. Can this cause the afib?
.