What is a vagal reaction

The vagal response involves your central nervous system, your peripheral nervous system, and your cardiovascular system. 2  When the reflex is triggered it causes an abrupt dropping of your blood pressure and a sudden reduction in your heart rate.

What triggers the vagal response?

Causes. Vasovagal syncope occurs when the part of your nervous system that regulates heart rate and blood pressure malfunctions in response to a trigger, such as the sight of blood . Your heart rate slows, and the blood vessels in your legs widen (dilate.) This allows blood to pool in your legs, which lowers your blood pressure.

What to do when having a vasovagal reaction?

A vasovagal episode can be frightening, but is usually not a sign of a health emergency. The best thing to do is to lie down for approximately 10 minutes or so. Another option is to lower your head between your knees. Drinking some water may be of help as well.

What causes a vasovagal reaction?

Vasovagal reaction, also called vasovagal response or vasovagal syncope, is a type of dizziness or fainting. It is often related to emotional stress (such as the sight of blood or being in a hot, crowded place) and is not usually life-threatening. It can also be caused by physical stress, such as dehydration, standing too long or a fever.

What causes a vagal episode?

Vagal responses are caused by many things. They include suddenly getting up, pain, fear, excitement, immersion of the head in cold water, or stimulation of the coratid artery in the neck. Even going to the bathroom can cause the effect in some people. Vagal responses can be useful, however, in rare conditions.

What causes a vagal episode?

Vagal responses are caused by many things. They include suddenly getting up, pain, fear, excitement, immersion of the head in cold water, or stimulation of the coratid artery in the neck. Even going to the bathroom can cause the effect in some people. Vagal responses can be useful, however, in rare conditions.

What causes a vasovagal reaction?

Vasovagal reaction, also called vasovagal response or vasovagal syncope, is a type of dizziness or fainting. It is often related to emotional stress (such as the sight of blood or being in a hot, crowded place) and is not usually life-threatening. It can also be caused by physical stress, such as dehydration, standing too long or a fever.

What is the connection between the vagus nerve and fainting?

Fainting: if you feel weak in the knees at the sight of blood, that’s your vagus nerve triggering a response called vagal syncope . It’s a short term overwhelm of the vagus nerve that restricts blood to the brain and you’ll soon get that “tunnel vision” and possibly pass out. Or just sit down and breathe until it subsides.

Can pain trigger vasovagal syncope?

In most people with vasovagal syncope, the dilation of blood vessels appears to be the predominant factor that causes loss of consciousness. In some people, however, the slowing of the heart rate plays a major role. Common triggers of vasovagal syncope include: Sudden, severe pain.