1/3. Axial lateropulsion as a sole manifestation of lateral medullary infarction: a clinical variant related to rostral-dorsolateral lesion.A 63-year-old woman presented with an isolated axial lateropulsion as a sole manifestation of lateral medullary infarction. She had no vertigo, nystagmus, dysphagia, hiccup, facial/hemisensory loss, horner syndrome, and limb ataxia. brain MRI showed a small infarct selectively involving the most dorsolateral portion of the rostral medulla. This patient illustrates that lateral medullary infarction may present as an isolated lateropulsion. The possible mechanism of an isolated lateropulsion is described.- - - - - - - - - - ranking = 1keywords = vertigo (Clic here for more details about this article) |
2/3. vertigo in virtual reality with haptics: case report.A researcher was working with a desktop virtual environment system. The system was displaying vector fields of a cyclonic weather system, and the system incorporated a haptic display of the forces in the cyclonic field. As the subject viewed the rotating cyclone field, they would move a handle "through" the representation of the moving winds and "feel" the forces buffeting the handle as it moved. Stopping after using the system for about 10 min, the user experienced an immediate sensation of postural instability for several minutes. Several hours later, there was the onset of vertigo with head turns. This vertigo lasted several hours and was accompanied with nausea and motion illusions that exacerbated by head movements. Symptoms persisted mildly the next day and were still present the third and fourth day, but by then were only provoked by head movements. There were no accompanying symptoms or history to suggest an inner ear disorder. physical examination of inner ear and associated neurologic function was normal. No other users of this system have reported similar symptoms. This case suggests that some individuals may be susceptible to the interaction of displays with motion and movement forces and as a result experience motion illusions. Operators of such systems should be aware of this potential and minimize exposure if vertigo occurs.- - - - - - - - - - ranking = 3keywords = vertigo (Clic here for more details about this article) |
3/3. Visual illusions in a patient with lateral medullary syndrome.The disturbance of visual perception associated with nystagmus is a rare phenomenon. This is a case of a 61-year-old woman who developed progressive right hemisensory deficit, left facial sensory deficit, vertigo, staggering to the left, left ptosis, vertical diplopia, and ataxia of the left upper extremity. She had rotatory nystagmus in primary position, which increased in amplitude with left gaze. The above signs and symptoms were consistent with lateral medullary syndrome. During her rehabilitation, the patient complained of visual disturbances typical of oscillopsia. These disturbances, or illusions, are compensatory mechanisms for nystagmus and its resultant retinal error. The purpose of this case presentation was to study the pathophysiology underlying oscillopsia in patients with nystagmus and to stimulate awareness of such visual disturbances in stroke patients.- - - - - - - - - - ranking = 1keywords = vertigo (Clic here for more details about this article) |