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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.
Vasovagal Syncope. Thus vasovagal syncope is a loss of consciousness triggered by a vagal response. Vasovagal syncope can cause a person to pass out and drop to the ground. With syncope, the state of unconsciousness typically only lasts for a couple of minutes. As blood flow returns to the brain, the person will return to a normal state of consciousness.
Vasovagal syncope causes are certain triggers that vary among those who experience this condition. The ones previously mentioned, stress and the sight of blood, are the two most common, followed by: Exposure to hot temperatures. Prolonged standing. Fear. Muscle strain (difficult bowel movements) Extreme pain. Fasting.
Vasovagal response syndrome can be caused by: Heat exposure. Standing for long periods of time. Seeing blood or having blood drawn. Straining to have a bowel movement. Running or other strenuous exercise. Extreme fear, panic or other situational stressors.
Vasovagal Syncope Causes. Vasovagal syncope can be caused by emotional distress, bodily stress or sudden changes, other forms of stress, or heart conditions that can take a toll on the body. Emotional distress. Experiencing emotional shock and distress can cause an overreaction of the vagus nerve function and lead to fainting.
The vasovagal response is a complex signaling of the brain that dilates the blood vessels in the legs, slows the heart rate, and very often causes fainting, which is also called vasovagal syncope. This signaling begins with some outside stimulus such as being injured, seeing blood or getting an injection.