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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 ...
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).
Lightheadedness is a common and typically unpleasant sensation of dizziness [1] or a feeling that one may faint.The sensation of lightheadedness can be short-lived, prolonged, or, rarely, recurring.
A frequent type of syncope, termed vasovagal syncope is originated by intense cardioinhibition, mediated by a sudden vagal reflex, that causes transitory cardiac arrest by asystole and/or transient total atrioventricular block. [1] [2] It is known as “Vaso-vagal Syncope”, “Neurocardiogenic Syncope” or “Neurally-mediated Reflex Syncope ...
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.
Micturition syncope or post-micturition syncope is the name given to the human phenomenon of fainting shortly after or during urination.The underlying cause is not fully understood, but it may be a result of vasovagal response, postural hypotension, or a combination thereof.
Syncope rapidly ensues. Indeed, the short latency between the stimulus and the attack has been emphasized as an important distinction from the more familiar (at least in older children and adults) vasovagal syncope. The child loses awareness and postural tone, falling to the ground. There may be down-beat nystagmus.
The discussion of the evolutionary basis of needle phobia in Hamilton's review article concerns the vasovagal type of needle phobia, which is a sub-type of blood-injection-injury type phobia. This type of needle phobia is uniquely characterized by a two-phase vasovagal response. [4] First, there is a brief acceleration of heart rate and blood ...