الفهرس 
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Abstract
Although dizziness ranks among the most common afflictions, its causes are often difficult to specify.In our study we examined 128 patients presenting to Health Insurance Outpatients from October 1996 to April 1999 with main complain of dizziness. Dizzy patients due to non neurovestibular lesions were excluded, thus we have studied the videonystagmogaply of one hundred dizzy patients of neurovestibular origin. In the present study we diagnosed 11 causes for dizziness Benign Paroxysmal Positional Vertigo (BPPV) and Meniere’s disease represented 50% of our patients while the other nine specifications represented the other fifty percent of patients. In our study using the videonystagmoscope and performing the two maneuvers (Dix & Hallpike, lateral positioning) in BPPV we had found that 28 patients had posterior semicircular affection while only 3 patients had lateral semicircular canal affection. Videonystagmoscopic finding in our 19 patients suffering from Meniere’s disease, demonstrated that 14 patients presented with spontaneous nystagmus. However ENG could show this spontaneous nystagmus in only 9 patients thus demonstrating the superiority of videonystagmoscopy in detecting spontaneous nystagmus. In our study the videonystogmoscopy findings showed spontaneous nystagmus in all 16 cases of vestibular neuritis, while only 11 patients showing spontaneous nystagmus through the ENG examination demonstrating again the superiority of videonystagmoscopy on ENG in detecting nystagmus. In Viral labyrinthitis patients videonystagmoscopy showed spontaneous nystagmus in seven patients while ENG showed this spontaneous nystagmus in only four patients and failed to show it in three patients. Videonystagmoscopy showed positional nystagmus in all cases of cervical vertigo, three patients presented direction changing nystagmus and four patients showed nystagmus on lying on one side. Similarly this positional nystagmus was detected in all seven patients by ENG examination. In vertebrobasilar insufficiency patient the videonystagmoscopy showed no abnormalities, the caloric test showed significant hyporeflexia in two patients but which could be aftributed to aging process. However in Battery of central test of ENG examination five patients had abnormal smooth pursuit test i.e. saccadic pursuit. In patients with multiple sclerosis The videomsyotagmoscopic findings was normal in two patients and one patient presented with ageotropic nystagmus in Dix and Hallpike maneuver, there was no patients with abnormal caloric response. Central battery tests showed bilateral abnormality of saccade test (unilateral dissociation). Both Videonystagmoscopic examination and ENG failed to detect any abnormal findings in vertiginous Migraine patient. The videonystagmoscopic findings of Vestibular schwannomas showed spontaneous nystagmus in one patient and also ageotropic nystagmus was observed in the same patient while ENG showed normal findings except canal paresis in one patient. the videonystagmoscopic finding showed positional nystagmus with direction changing in the patient suffering from vascular loop at left root entery zone. In ototoxicity patient electronystagmography and videonyostagmscopy showed no abnormalities.