Rotary chair findings in patients with peripheral vestibular lesions

Imbalance and vertigo are among the most common symptoms causing patients to visit a physician. The rotational chair is one test modality used in the diagnosis of peripheral vestibular lesions through its ability to test higher, more physiologic frequencies and provides an adjunct to caloric and other ENG tests. The aim of this study was to assess the role of low frequency rotary chair testing in the evaluation and diagnosis of peripheral vestibular lesions. Forty subjects suffering from unilateral peripheral vestibular lesions, documented by the caloric test participated in this study. Twenty healthy adults served as control. They were subjected to: history taking, audiological evaluation, ENG and rotational chair testing in the form of Rotational Sinusoidal Harmonic Acceleration [SHA] test and Rotational Velocity Step Test [VST]. Results of the SHA test showed phase lead and reduced gain at low and mid frequencies [p<0.001] that improved at higher frequencies, together with reduced time constant [TC] in the velocity step test [p<0.001] between the study and control groups. TC was reduced in the study group in response to rotation towards the side of the lesion. Results of the VOR phase and gain between study groups according to different etiologies revealed that acoustic neuroma had the highest mean in the gain parameter [p<0.01]. In patients with unilateral peripheral vestibular lesions: gain reduction and phase lead are the main abnormalities seen with SHA test and are more pronounced at low frequencies of the test range. Rotational VST demonstrated response asymmetries in the form of reduced TC in response to rotation towards the side of the lesion. The onset and course of the peripheral vestibular lesion have an important effect on the degree of compensation mechanism

clinical and histopathological studies of a rare tumor in the mental region of the mandible

This work is an announcement for all those who are interesting with surgery of the face, to take into consideration the parasitic infection [onchocercosis] when confronted with any case with maxillofacial nodules with a history of long duration and especially in those coming from endemic areas