Biomedical subjects
Publications and source records attributed to S Erkulvrawatr.
We describe here four additional cases of intrathoracic meningoceles associated with neurofibromatosis, bringing the total number of reported cases of thoracic meningoceles to 88. Seventy-five (85%) have been associated with neurofibromatosis. Possibly, both dural and regional vertebral dysplasia are intrinsic to neurofibromatosis and contribute to the development of the meningocele.
Transient global amnesia is a clinical syndrome characterized by sudden onset of short-term memory loss followed by retrograde amnesia in an otherwise healthy subject. During the attack, the patient remains alert and retains much of his personal identity. The patient usually becomes upset and concerned about his memory loss. This condition may be diagnosed incorrectly as hysteria, psychosis, or temporal lobe seizure, despite its unique clinical features.
A non-right-handed patient developed alexia without agraphia from a right occipital lobe infarction. An intracarotid amobarbital test showed left hemispheric dominance for speech. The cause of alexia in this patient could not be explained simply by the accepted disconnection hypothesis, which proposes that speech, handedness, and reading functions reside in the same hemisphere. The findings in this patient suggest that his speech function is located on the left, whereas his functions for reading and writing are located in the right hemisphere.
Complete spontaneous resolution of bilateral subdural hematoma overa period of 17 months was documented by both radioisotopic brain scan and cerebral angiogram. It is suggested that the favorable response to the medical treatment in some cases should be interpreted with caution.
Studies of the blink reflex were undertaken in twelve normal subjects during wakefulness and different sleep stages. The early R1 and the late R2 components of the reflex were analyzed. R1 was present in only one subject during stage I sleep and subsequently disappeared in stage II to IV. In all subjects, R2 was gradually diminished and totally disappeared during stage IV. During the REM stage, R1 was seen in only four-out-of-twelve subjects but all R2 returned. Alterations of R1 and R2 of the blink reflex during different sleep stages suggest that the underlying mechanism includes both supranuclear and infranuclear activities. Our finding strengthens further the notion of dual hyponogenic mechanisms for sleep.
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