Syncope is defined as a transient loss of consciousness and postural tone, characterized by rapid onset, short duration, and spontaneous recovery, and the process of syncope progression is here described with two types of sympathetic change. Simultaneous recordings of microneurographically-recorded muscle sympathetic nerve activity (MSNA) and continuous and noninvasive blood pressure measuremen...

recurrent syncope of obscure etiology, particularly in those with structural heart diseases, is associated with higher mortality rates. there are insufficient and conflicting data on prevalence and etiology of syncope in the urban middle eastern population. evaluating the etiologic basis of syncope can be an effective step in prevention of morbidities and sudden cardiac death in susceptible pop...

Clinical data are reported for 13 patients who were referred with recurrent loss of consciousness at night interrupting their sleep. Most of the patients were women (10 of 13) with a mean age of 45 years (range 21-72 years). The histories were more consistent with vasovagal syncope than with epilepsy. This was supported by electroencephalographic and tilt test results. More polysomnographic mon...

OBJECTIVE To determine if serum cardiac troponin I (cTnI) concentration distinguishes between cardiogenic syncope and collapsing dogs presenting with either generalized epileptic seizures (both with and without cardiac disease) or vasovagal syncope. ANIMALS Seventy-nine prospectively recruited dogs, grouped according to aetiology of collapse: generalized epileptic seizures (group E), cardioge...

Vasovagal reflex may cause benign self-limiting syncope triggered by factors such as pain and emotional stress. However, rarely, it cardiac arrest requiring urgent resuscitation, which has heretofore not been reported during blepharoplasty. In this report, the case of a 28-year-old man who underwent blepharoplasty under local anesthesia is presented. He suddenly experienced bradycardia subseque...

Background—The pathophysiology of vasovagal syncope is poorly understood, and the treatment usually ineffective. Our clinical experience is that patients with vasovagal syncope fall into 2 groups, based on their supine systolic blood pressure, which is either normal ( 100 mm Hg) or low (70–100 mm Hg). We investigated neural circulatory control in these 2 phenotypes. Methods and Results—Sympathe...

pulmonary thromboembolism (pte) has a wide spectrum of presentations, and its c ardinal manifestations include chest pain, dyspnea, and syncope. syncope as an initial presentation of pte occurs in 10-14% of patients and is not restricted to massive ptes. it can also occur in the setting of non- massive cases probably due to a vasovagal mechanism or the occurrence of conduction disturbances in p...

AIMS To compare the therapeutic efficacy of placebo, propranolol, and fluoxetine in patients with vasovagal syncope (VVS). METHODS AND RESULTS Ninety-six consecutive patients with VVS were randomized to treatment with placebo, propranolol, or fluoxetine and followed-up for 6 months. Before and during treatment, they reported their syncopal and presyncopal episodes and graded their well-being,...