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Biomedical subjects

J K Vries

Publications and source records attributed to J K Vries.

At least 37 records · Page 2Linked to original sources
PubMed1982

Changes in the visual evoked potentials of hydrocephalic children.

The visual evoked potentials (VEPs) of a group of 84 hydrocephalic children, aged between 2 days and 15 years, were studied. The variables analyzed were age, ventriculomegaly, head size, and the presence or absence of a functioning shunt. In infants, an increase in the latency of the primary positive wave (P2) was confirmed, but this was present consistently only when ventriculomegaly was accompanied by increased head size. Improvement in the VEP was slow to follow shunting. No change in the latency of P2 was found during hydrocephalic episodes in older children.

Adolescent↗
PubMed1981

Influence of closure technique on results in myelomeningocele.

The results of the repair of myelomeningoceles by, respectively, reconstitution of the neural tube and simple replacement of the placode within the dural sheath are examined. It is concluded that neither offers any significant advantages over the other. When no neurologic function is present below the upper level of the lesion, no method of repair is likely to result in improvement, while the mere preservation of reflex activity in the distal segment of cord may be counterproductive. It is suggested, therefore, that there is a place for immediate excision of the lesion in properly selected cases.

Brain↗
PubMed1980

Postoperative evaluation of third ventriculostomy patients using 111in-DTPA.

A radioisotope scanning and clearance procedure has been developed for the postoperative assessment of third ventriculostomy patients. The patency of third ventriculostomy sites can be verified by this procedure, and the bulk flow clearance of CSF can be quantitated. 4 postoperstive third ventriculostomy patients have been evaluated by this procedure to date. In each case the third ventriculostomy site was shown to be patent. The bulk flow clearance of CSF ranged from 170 to 342 cm3/24 h. Comparison of these figures with estimates of CSF production suggests that the majority of CSF reabsorption in these patients occurs through the arachnoid villi.

Arnold-Chiari Malformation↗
PubMed1980

Percutaneous tunnel ventriculostomy. Summary of 100 procedures.

External ventricular drainage is an important therapeutic adjunct in neurosurgical practice. Unfortunately, this procedure has been associated with a significant incidence of ventriculitis. A major source for many of these infections has been bacterial contamination of the tract of the ventricular catheter, at the site where it enters the scalp. To prevent this problem, the authors have devised a new ventriculostomy technique that involves tunneling the ventricular catheter through the scalp, between the dermis and the galea. One hundred consecutive procedures in 66 patients are analyzed in this paper. The average duration of drainage was 6.2 days. There were no infections subsequent to the insertion of the ventricular catheter in this group of patients.

Cerebral Ventricles↗
PubMed1980

A quantitative assessment of CSF reabsorption in infants with meningomyelocele.

The production of cerebrospinal fluid and bulk flow reabsorption were determined in four children with meningomyelocele who developed hydrocephalus. By subtracting bulk flow reabsorption from CSF production, the amount of CSF reabsorbed by alternative pathways was determined. The results of the study indicate that the majority of CSF reabsorption in these patients takes place by bulk flow. CSF reabsorption by alternative pathways, however, is significant.

Absorption↗
PubMed1980

Endoscopy as an adjunct to shunting for hydrocephalus.

A procedure has been developed for positioning ventricular catheters using a miniature fiberoptic endoscope. The procedure permits accurate positioning of the ventricular catheter tip without the need for intraoperative X-ray studies. The procedure has been employed 102 times in 85 children. In each case, post-operative X-ray studies revealed the ventricular catheter to be in a satisfactory position. In 79% of cases a functional shunt was established which did not require revision or further therapeutic intervention.

Catheterization↗
PubMed1979

Cranio-orbital correction for massive enlargement of the cranial vault.

A case is reported in which an immense cranial vault was reduced as part of the rehabilitation of a patient with severe hydrocephalus who had preservation of the intellect. This patient was selected carefully, and we do not advocate such procedures on every hydrocephalic. This patient was recumbent and bedridden prior to the procedure because of the size and weight of his head, but he was able to move freely in a wheelchair and attend a special school after the reduction of the skull.

Cephalometry↗
PubMed1979

Ganglioglioma of the medulla oblongata.

A patient with signs and symptoms suggestive of symptomatic Arnold-Chiari malformation was encountered. Neuroradiologic investigation revealed the presence of a medullary tumor, which later proved to be a ganglioglioma. A review of the literature suggests that this presentation is typical of medullary gangliogliomas. It is proposed that the pathophysiology of this lesion renders it amenable to decompressive therapy via suboccipital craniotomy.

Arnold-Chiari Malformation↗
PubMed1978

Laparoscopy in the diagnosis and treatment of malfunctioning ventriculo-peritoneal shunts in children.

Abdominal complications following ventriculo-peritoneal shunting for hydrocephalus are not uncommon. One of the complications that has heretofore required abandonment of the peritoneal shunt has been entrapment or encystation of the peritoneal limb of the catheter system. Four infants have been identified with malfunction of the peritoneal limb of the system by characteristic physical findings of increasing head size and dissection of fluid along the shunt track. Abdominal radiographs in multiple views revealed the tip of the peritoneal catheter to be fixed in position in each patient and sonography aided in identification of encysted catheters. These infants underwent six laparoscopic procedures to define the cause of shunt malfunction and to reposition the catheter. Cerebrospinal fluid cysts were encountered in three infants and entrapment by the falciform ligament in the fourth. All catheters were easily repositioned within the abdominal cavity with laparoscopy forceps and three of the infants presently have normally functioning shunt systems.

Cerebrospinal Fluid Shunts↗
PubMed1978

An endoscopic technique for third ventriculostomy.

A simple technique for performing third ventriculostomy is described. The technique utilizes a fiberoptic endoscope inserted through a small burr hole over the coronal suture. The technique has been successfully employed in five patients without complications. If better criteria for selection of patients for third ventriculostomy could be established, this procedure would provide an ideal means for treatment.

Cerebral Ventricles↗
PubMed1977

Tension free closure of large meningomyelocele defects.

A technique for closing large meningomyelocele defects without tension has recently been developed by the authors. The technique utilizes bilateral bipedicle flaps developed from verticle flank incisions. The bipedicle flaps are advanced medially and approximated in the midline. The lateral defects created by this maneuver are closed transversely. The outer margins of the bipedicle flaps are left free until the flaps become adherent to the underlying tissue. This technique has been used in the repair of 12 large meningomyeloceles. The width of the average lesion was 6-7 centimeters, the largest lesion was 11 centimeters. In each case the width of the lesion exceeded one-half the width of the back. In all cases a tension free closure was achieved. There were no significant wound complications. The use of this technique has greatly facilitated the treatment of children with large meningomyelocele defects.

Humans↗