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Biomedical subjects

F Peeters

Publications and source records attributed to F Peeters.

24 records · Page 2Linked to original sources

The value of computer tomography, orbital venography and carotid angiography in the diagnosis of exophthalmos.

On the bases of 25 patients examined by orbital venography, computer tomography, (CT scanning) and sometimes carotid angiography, the diagnostic value of each of these methods is evaluated. The data obtained are compared with the corresponding information from the literature. In view of the findings it can be stated that CT scanning can be regarded as the primary neuroradiological examination in cases of exophthalmos. Orbital venography gives supplementary information in cases of varices and venous malformations. Angiography is the method which supplies the maximum of information when cavernous sinus fistulae are clinically suspected. With reference to 3 patients it is explained that in such selective angiography of the internal and external carotid and the vertebral artery is indicated.

Adolescent↗

Noble gas and major element constraints on the water dynamics in an alpine floodplain.

The hydrogeological system of an ecologically sensitive alpine floodplain in the Valle di Blenio, Switzerland, was investigated using hydrochemical and 3H-3He dating methods. Water samples from six wells and from different surface locations were analyzed. The analysis of the concentrations of major ions in conjunction with age determination by the 3H-3He-method allowed the main hydrological properties of the system to be consistently characterized. Two geochemically distinct water zones can be distinguished: Ca-SO4-dominated water from the main river and Ca-HCO3-dominated floodplain water. The floodplain water component characterizes the whole floodplain including the surficial hillslope drainage system. Within the ground water samples, two spatially and temporally different types of water can be determined. A younger (age < 1.5 years), less mineralized water is found in the upper part of the aquifer during the summer season. The underlying aquifer zone contains older and more highly mineralized water. However, the general hydrochemical characterization of both types of ground water is similar. In winter, the water ages increase with decreasing ground water levels. Because precipitation is stored temporarily in the snow cover, the contribution of the younger near-surface ground water decreases, resulting in higher apparent water ages and higher mineralization in the upper zone of the aquifer. Water exchange between the main river and the ground water system is limited to ground water exfiltration from the shallow aquifer zone, whereas the hydrochemical separation of the deeper aquifer zone indicates the isolation of the deeper ground water from the main river.

Geological Phenomena↗

The combined treatment of congenital vascular defects.

UNLABELLED: Eighty-one patients with a vascular malformation on the extremities were evaluated. In 32 patients the abnormality was localised in the upper and in 49 in the lower extremity. Signs, symptoms, treatment modalities and long-term results were tabulated. In the upper extremity pain was the most frequent presenting symptom. Three types of malformation were distinguished: purely venous, venous with microshunts and malformations with macroshunts. The treatment of the first group consisted of excision of varices and superficial naevi, in the second group the combined treatment of embolisation and excision was the treatment of choice, in the last group the selective embolisation without resection was most frequently done. The treatment was most successful in those cases, where there was a malformation with macrofistulas in the shoulder-region or only a localised lesion, that could be excised. The first sign and symptom of the lower extremity was swelling or a naevus vasculosus. After inventarisation 4 groups of vascular malformations have been distinguished, the cavernous (venous), the cavernous (venous) with microshunts, the arteriovenous with macrofistulas and a purely venous (truncular) group, which we did not have in our patients with an upper extremity abnormality. Conservative treatment in purely venous malformations prevented progression, the combined treatment was successful in patients with an AV-malformation of the pelvis, or around the knee or in patients with a small excisable lesion. IN CONCLUSION: the purely venous abnormality can be successfully treated with conservative measures, the arteriovenous malformation with macroshunts in pelvis and shoulder region should be embolised, and circumscript lesions excised with or without embolisation, depending on the character of the lesion.

Adult↗