(Pathology) a faint brought on by excessive activity of the vagus nerve, causing the heart to slow and the blood pressure to fall. It can be caused by fear, choking, or stomach cramps and has no lasting effects
The probable cause of syncope is vasovagal syncope (VVS) occurring because of profound systemic hypotension due to reex vasodilatation, or vagally driven bradycardia, or both followed by dizziness, presyncope and finally syncope.
Also, a paper published in Circulation Journal titled "Usefulness of physical maneuvers for prevention of vasovagal syncope" says squatting and leg-crossing with muscle tensing can be used as a simple and effective preventive maneuver in patients with VVS.
Patients followed up with a misdiagnosis of epilepsy or vasovagal syncope may present with sudden cardiac arrest as a result of adrenergic stimuli, like in our patient.
The on-call cardiologist made the decision for hospitalization in 98.9% of patients in the cardiogenic group, 100% in unknown causes patients, 31.6% in vasovagal syncope, and 50% for postural hypotension (P< 0.001; Figure 2).
There are some reported cases of IVC enlargement in the setting of normal RAP, including highly trained athletes, patients with large body-surface area, young adults with history of vasovagal syncope, those on mechanical ventilation, or those with structural causes such as narrowing of the IVC-RA junction, web or tissue present in the IVC, or prominent Eustachian valve [5, 8, 9].
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