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Episodes of vasovagal syncope are typically recurrent and usually occur when the predisposed person is exposed to a specific trigger. Before losing consciousness, the individual frequently experiences early signs or symptoms such as lightheadedness, nausea, the feeling of being extremely hot or cold (accompanied by sweating), ringing in the ears, an uncomfortable feeling in the heart, fuzzy ...
Vagovagal reflex refers to gastrointestinal tract reflex circuits where afferent and efferent fibers of the vagus nerve [1] coordinate responses to gut stimuli via the dorsal vagal complex in the brain.
Vagal tone is activity of the vagus nerve (the 10th cranial nerve) and a fundamental component of the parasympathetic branch of the autonomic nervous system.This branch of the nervous system is not under conscious control and is largely responsible for the regulation of several body compartments at rest.
Migraines, abdominal pain, "feeling funny" or blurred vision may also occur before or after episodes. [ 1 ] [ 3 ] Possible causes of the condition include pain or nerve stimulation on the scalp (similar to parade-ground syncope), or compression of blood vessels or nerves resulting from neck flexion or extension . [ 2 ]
Vasovagal syncope can be considered in two forms: Isolated episodes of loss of consciousness, unheralded by any warning symptoms for more than a few moments. These tend to occur in the adolescent age group and may be associated with fasting, exercise, abdominal straining, or circumstances promoting vaso-dilation (e.g., heat, alcohol).
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Heat syncope is fainting or dizziness as a result of overheating (syncope is the medical term for fainting). It is a type of heat illness.The basic symptom of heat syncope is fainting, with or without mental confusion. [1]
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