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Biomedical subjects

D J Dalessio

Publications and source records attributed to D J Dalessio.

At least 19 recordsLinked to original sources
PubMed1992

P300 in multiple sclerosis: a preliminary report.

The P300 component of the event-related brain potential (ERP) elicited with auditory stimuli and pattern-shift visual evoked potentials (VEPs) was obtained from 16 patients with multiple sclerosis (MS) and 16 matched control subjects. P300 latency was significantly longer and component amplitude relatively depressed in the MS patients compared to control subjects. The P100 potential of the VEP also was delayed for both full-field and half-field stimulus conditions in the patients compared to control subjects. The findings suggest that the P300 ERP may reflect the cognitive decline associated with MS.

Adult↗
PubMed1991

Diagnosis and treatment of cranial neuralgias.

Both medical and surgical therapies may be used in the treatment of trigeminal neuralgia and glossopharyngeal neuralgia. Ordinarily, the treatment is medical; however, if a response to drugs is not forthcoming, or if the patient becomes toxic while taking medications or refuses to abide by an appropriate medical program, then surgical consultation should be obtained and the appropriate operation performed. The form and type of neurosurgical procedure will probably depend to a considerable extent on the expertise of the neurosurgeon and his training. Generally, in the elderly, the simplest procedure should be attempted first. It may be necessary to employ both medical and surgical procedures in the individual patient. The medical drug of first choice is carbamazepine. Atypical facial neuralgia is a general term used to cover a variety of head and face pains that are poorly defined and that may not deserve separate clinical status. The pathogenesis of the atypical facial neuralgias is uncertain, and multiple causation seems likely. Search for local inflammatory pathology, neoplasms, vasomotor phenomena, and depressive symptoms is indicated. Treatment should be guided by the findings.

Facial Pain↗
PubMed1990

The pathology of migraine.

It is well established that multiple influences regulate cerebral blood flow; the overwhelming evidence continues to suggest that migraine is a disorder, albeit temporary, of cerebral hemodynamics. Thus, the classical theory of migraine is no longer tenable as viewed strictly and rigidly. Perhaps it would be easier to say that the migraine's aura is characterized by reduction in blood flow, often hemispheric, and that sometime during the headache phase cerebral hyperperfusion occurs. The process is under the control of multiple factors: neurogenic, chemical, metabolic, and myogenic. The blood flow changes do not necessarily correlate with the patient's symptoms. Thus, even now, migraine and other vascular headaches remain as descriptive diagnoses. The final pathology of migraine remains to be determined.

Brain↗
PubMed1990

Noninvasive trigeminal evoked potentials: normative data and application to neuralgia patients.

A mild electric shock applied to the lower lip was used to elicit reliable evoked potentials from the trigeminal nerve in 20 normal young adults. The wave forms were morphologically similar to those observed with invasive procedures. No substantial differences for either the right or left side of stimulation, recording electrode, or subject sex were obtained for any of the individual potential amplitudes or latencies. The same procedures were applied to 10 patients who had been treated with retrogasserian glycerol injections for trigeminal neuralgia. Trigeminal evoked potentials were elicited in all patients, although the quality of the individual wave forms was more variable than that observed for the normal subjects. Comparison of the treated with the unaffected face side in the patients demonstrated significantly smaller N2-P2 amplitudes and longer N2 latencies for the affected face side. The results suggest that these procedures produce reliable evoked potential measures of trigeminal nerve function noninvasively which can provide an objective index of treatment efficacy.

Adult↗
PubMed1989

Percutaneous injection of glycerol for the treatment of trigeminal neuralgia.

There continues a significant debate over the best contemporary method for treating trigeminal neuralgia. Glycerol injection into the trigeminal cistern has been used in a consecutive series of 200 patients. A total of 80% of the patients have had good or excellent pain relief. Side effects have been a mild and usually transient numbness and tingling or mild objective sensory deficit to pin and touch in approximately 1/2 of the patients. Complications have been extremely infrequent and have resolved in time. A recurrence rate of 24% has been the single largest disadvantage of the procedure. Reinjection is usually successful in treatment of recurrence. The combination of efficacy, minimal and temporary neurologic dysfunction, and low complication rate make this procedure, in our opinion, the procedure of choice for the first step, when surgical treatment is required.

Female↗