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Biomedical subjects

J Lichý

Publications and source records attributed to J Lichý.

At least 19 recordsLinked to original sources
PubMed1992

[Computer tomography of the brain in children. II].

The second part of the study "Computerized tomography of the brain in children" is a continuation of the first one published in Supplement for the Collection of Scientific Works by Charles University's Medical Faculty in Hradec Králové from 1990. The former is issued from analyzing 1283 pathological CT findings investigated in newborns and children up to 15 years of age. The present study is concerned with not only the precise diagnosis of the lesion site but also with the type diagnosis and observation of further development of either affected or operated on children brain. When investigating ventriculomegalies, altogether with critical approach to the CT possibilities in diagnosing various types of hydrocephaluses and atrophies, which have been the most frequent pathological findings in this set, the authors also proceeded by monitoring reparative capacities of the brain tissue or post-surgery drainage complications. The problems of children CT investigation are similar to those in adults as far as the brain abscesses, empyemas and non-bacterial encephalities are concerned. A possibility of repeated examinations is of importance in selecting therapeutical approaches and observing their effect. A considerable amount of viral inflammations and the toxoplasmosis appear to be specific for children's age with yet intrauterine course of several of them. They result in severs cerebral damage, hydrocephalus and atrophy with frequent both periventricular and parenchyma calcifications. The acute meningitis did not show unambiguously positive CT findings, though they are frequent to result in mainly the obstructive or hyporesorptive types of hydrocephalus as well as atrophic changes. Only the 8 per cent of post-inflammatory intracranial patients showed normal time-delayed CT finding. From neurocutaneous syndromes, those most frequently occurring were cerebral manifestations of tuberous sclerosis. Apart from periventricular calcifications within the hamartomatous node, the three patients showed large pseudotumorous formations responsible of the deformity of lateral ventricles. In the frame of neurofibromatosis, the authors diagnosed the stenosis of aqueducts, conditioned with adjacent gliosis, and the dysplasia of the base of medial cranial fossa which caused the temporal lobe to prolapse into the fossa subtemporalis and the orbit. The exceptional finding in this set of patients was that of angioreticuloma within the ponto-cerebellar angle in a 10 year-old boy. According to literature, this type of hamartoma does not occur in children of prepubertal age. In 37 children of our set, the extra- or intraparenchymal cavities were diagnosed. Those most frequently occurring were arachnoidal cysts at the pole of temporal lobe as well as porencephalic intraparenchymal cysts.(ABSTRACT TRUNCATED AT 400 WORDS)

Adolescent↗
PubMed1990

[External lumbar cerebrospinal fluid drainage with controlled flow-- its use in pediatric neurosurgery].

The authors describe cases of external lumbar CSF drainage with a regulated flow inserted lumbally or in the pseudomeningocele in children. During flow regulation during operation they were guided by the finding in the surgical field, during therapeutic use (in the course of 1-8 days) by setting the CSF output at 15 ml/hour. Drainage was used in extradural approach to the orbit, for treatment of liquorrhoea in surgical wounds of the posterior fossa, frontal and temporal drainage to clear the CSF in meningitis and to make inner drainage possible. CSF fistulae healed even after major craniectomies and infections due to the resistance of allogenic and xenogenic dural transplants. For external CSF drainage the authors used lumbar needles, intravenous Portex kits or original Cordis kits. The latter proved to be the best.

Central Nervous System↗
PubMed1990

HLA antigens in children with epilepsy.

In accord with our results, a significantly higher occurrence of HLA-B17, B27 and A2, B27 haplotype is scrutinized in a total of epileptical children with psoriasis inheritance comparably to the occurrence rate in population (P = 0.05; P = 0.01; P = 0.001). We failed to detect HLA-B13 antigen in our 9 healthy siblings, though this finding was insignificant in our group. Mentioned findings are supporting the suggestion that also HLA-linked genetic factors associated with the type of immune responsiveness may be involved in pathogenesis of epilepsies in our patients. Nevertheless, due to the restricted number of examinations provided, our results are only of tracing value in presuming possible importance of HLA antigenic monitoring in postinflammatory epilepsy, so they cannot give us a satisfactory response. In the next future, it would be suitable to perform these examinations on far larger group of patients including the II. class HLA antigenic assessment.

Child↗
PubMed1990

[Computer tomography of the brain in children. I. 1. Perinatal encephalopathy of vascular origin. 2. Congenital brain malformations].

CT findings are evaluated in 103 children with vascular lesions (aged up to 15 years), and in 59 children with congenital cerebral and cerebellar malformations. Their maximum has been stated to occur perinatally due to hypoxic and ischemic brain affections. Therefore most of diagnostical problems were related to the differentiation of hypodense immature brain from ischemic changes. Mentioned findings were always correlated with clinical course. Similar confrontations along with earlier CT control examination may be helpful in distinguishing milder transitory postischemic oedema from serious necrotic and malatic changes. In more aged children, vascular lesions are of rare occurrence being different in etiology. More unambiguous CT patterns are obtained in vascular changes with hemorrhagies. Of special importance in their onset is a hypoxic attack with subsequent venous bleeding mainly into the germinative matrix. While well tolerated in premature newborns, the extensive hemorrhagies in on-term ones have worser prognosis, resulting in significant changes on control examination, predominantly hydrocephalus and porencephalia. Atrophies of various extent were the most common consequence of all encephalopathies of vascular origine. In almost a half of congenital brain and cerebellar anomalies, unsignificant findings of smaller middle line cavities were obtained predominantly in pellucide septum. From the serious findings, most frequent were different varieties of dysgenesis, hypogenesis up to agenesis of corpus callosum combined sometimes with either the lipomas or cysts. Another findings consisted in Dandy-Walker's cerebellar malformation, holoprosencephalia and only two patients manifested hydrencephalia and basal meningoencephalocele. Most of diagnostical effort has been made in mainly anomalies associated with ventriculomegalia and/or cystic formations in order to elucidate the eventual communication between the structures mentioned. In addition, CT ventriculo-cysto-orcisternography has also been performed using smaller amount of nonionic contrast. At present, an important portion of CT examinations may be replaced with sonography which is more simple as used in both newborns and toddlers.

Adolescent↗