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Biomedical subjects

B Levander

Publications and source records attributed to B Levander.

28 records · Page 2Linked to original sources
PubMed1978

Lumbo-omental shunt for drainage of cerebrospinal fluid--an experimental radionuclide study in dogs. II. Evaluation of transport routes from lumbar subarachnoid space to venous blood.

In a series of dogs, the transport routes of intrathecally administered 99Tcm-DTPA from an omental graft to the venous blood were studied by scintillation probes placed over the portal and external jugular veins and by blood samples from the inferior vena cava. It was found early in the course of investigation that a rich revascularization frequently occurred between the transplanted omentum and the surrounding muscles. In all dogs, the omental graft was divided, in its muscle tunnel about 5 cm outside the dural sac, 13--19 months after the implantation. Even after this a rapid transport to the venous system of radionuclide could be demonstrated. The revascularization of the graft was also studied morphologically in two dogs means of microangiography.

Animals↗
PubMed1978

Bulk flow of cerebrospinal fluid through a lumbo-omental pedicle graft in the dog.

Perfusion tests were performed in dogs with a pedicle graft of the greater omentum implanted in the lumbar subarachnoid space to measure its capacity to drain CSF. The CSF pressure was set at different levels in the range 0--50 mmHg and the outflow from a complete CSF space and then from the isolated dural sac was recorded in the same dog with an electronic drop recorder. It was shown that the omental graft could transport as much as 30% of the CSF normally carried by the physiological pathways. The spinal outflow in the controls was virtually non-existent. It is concluded that a bulk flow of CSF occurs through the graft. The results suggest that a lumbo-omental pedicle graft could possibly be used as a biological shunt in the treatment of hydrocephalus.

Animals↗
PubMed1978

Lumbo-omental shunt for drainage of cerebrospinal fluid--an experimental study in dogs. I. The transport of cerebrospinal fluid from the lumbar subarachnoid space, studied by 169Yb-DTPA and a gamma camera.

Studies using an experimental cerebrospinal fluid (CSF) shunting procedure are presented. By transposing a pedicle graft of the greater omentum to the lumbar subarachnoid space, the CSF absorption of the omentum can be utilized. Monitoring the absorption of intrathecally administration of 169Yb-DTPA by gamma camera sequential pictures 1 to 17 months after the shunt procedure, a rapid transport of radionuclide from the lumbo-omental shunt to the systemic venous blood was demonstrated.

Animals↗
PubMed1978

Computer tomography of the brain and spectrophotometry of the CSF in cerebral concussion and contusion.

Computer tomography (CT) and spectrophotometry of CSF were performed in 30 patients with the clinical diagnosis of cerebral concussion or contusion. The patients with concussion all had normal CT-findings. Spectrophotometry of CSF was sometimes positive for cerebral contusion with normal CT-findings, but the two methods were complementary so that the extent of the lesion was determined by CT and spectrophotometry of CSF indicated the cause.

Brain Concussion↗
PubMed1977

Variation with time of the attenuation values of intracranial hematomas.

Fourteen cases of subdural, epidural, and intracerebral hematoma, in which the time of the trauma or bleeding was known, were selected. Attenuation of samples taken at surgery showed good correlation with attenuation values determined by computed tomography (CT). The decrease in the attenuation of the hematoma from the time of trauma or bleeding was studied.

Brain↗
PubMed1977

Computed tomography of cranial subdural and epidural hematomas: variation of attenuation related to time and clinical events such as rebleeding.

Forty-one cases of subdural and nine of epidural hematomas were studied with regard to attenuation and the time between trauma and computed tomography scanning. The attenuation of the hematomas showed a consistent decrease with time during the first 4 weeks. High attenuation of chronic subdural hematomas is explained by a sudden or continuous rebleeding. No correlation was found between the attenuation of the hematoma and the attenuation of venous blood from the same patient.

Brain↗
PubMed1975

Stereotactic exploration of brain tumours by ultrasound.

A report upon a new technique for investigation of brain tumour anatomy by means of stereotactically directed ultrasound is presented with some illustrative cases. Information obtained with this technique has been found useful when deciding the treatment program for the tumour.

Brain Neoplasms↗
PubMed1975

Size of the intracerebral ventricles as measured with computer tomography, encephalography and echoventriculography.

Ventricular size in a total of 192 patients was determined with computer tomography (CT), encephalography (Enc) and echoventriculography (echo-VG). There was good correlation (greater than or equal to 0.80) between the values for the size of the lateral ventricles obtained with all three methods. Correlation between values for the width of the third ventricle: CT/Enc and CT/echo-VG: poor; Enc/echo-VG: good ( = 0.85). Both at computed tomography and encephalography there was poor correlation between anterior horn index and the width of the third ventricle.

Adolescent↗
PubMed1975

Computer tomography of traumatic intra- and extracerebral lesions.

Computer tomography was performed in 29 patients with intra- or extracerebral lesions and the results evaluated retrospectively and compared with angiography, operation or autopsy findings. Many subdural haematomas were difficult to distinguish and in two cases it was impossible. Angiography proved to be more certain. In all cases the intracerebral heamatoma was considerably more evident at computer tomography than at angiography and for contusions, the information provided is fully comparable with that by angiography.

Brain Injuries↗