What Is Vasovagal Syncope?
Reviewed: Dr. Gromatzky
1. Causes of Vasovagal Syncope
As previously explained, the mechanism causing vasovagal syncope to occur would be the overstimulation of the vagus nerve resulting in dilation of the blood vessels and the heart to slow down. This reduces the heart’s ability to pump blood toward the brain against gravity. Since there is inadequate blood supply to the brain, the brain shuts down temporarily leading to loss of consciousness or syncope. To reduce the risk of vasovagal syncope, it is best to avoid triggers such as excess heat, intense pain, standing for long durations, intense emotion, skipping meals, dehydration, sight of blood, prolonged exercise, or seeing a needle. Other potential triggers include coughing, having a bowel movement, and urination.
