Biomedical subjects
Publications and source records attributed to W Stoll.
Intracranial arteriovenous malformations in a father and daughter are described. The pathology involved in one of the patients was localized in the left dura, whereas that of the other was located in the left parietal lobe. Although clinical symptoms were different in each patient, possible hereditary factors in causing the malformations are discussed.
The isotope nephrograms of a total of 31 renally healthy pregnant women of different thirds of pregnancy are semiquantitatively investigated by 2 methods. The results are demonstrated graphically. This comparison show that a more correct result can be made with the describing method by taking a greater number of parameters describing the excretory phase.
The Swiss Neonatology Group was founded in 1972 to strengthen cooperation between obstetricians and pediatricians in this country. To this end a collaborative study was made of the incidence of respiratory distress syndrom in Switzerland during 1974. Almost every neonatal unit of the country participated, and the study thus covered the problem cases taken from approximately 90% of all Swiss newborns. 30% of the newborns hospitalized in neonatal units (or 2% of all Swiss newborns) developed a respiratory distress syndrome. 16% of these died. One third of all the cases of respiratory distress and two thirds of the deaths were due to hyaline membrane disease, which mainly occurred in prematures. The other cases of respiratory distress were divided between aspiration, transient respiratory distress and other pulmonary disorders. 31% of the newborns with respiratory distress syndrome underwent mechanical ventilation, more than half of these having hyaline membrane disease. The success already achieved by modern perinatology looks hopeful for the future.
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Renal function was investigated by isotope nephrography in 31 pregnant women with normal kidneys during various phases of pregnancy, and in 137 women on continuous contraceptive steroids (up to eight years). The semi-quantitative parameters of zum Winkel were used. It was found that the use of oral contraceptives did not lead to any change in renal function, whereas with advancing pregnancy there was distinct excretion delay on the isotope nephrogram. The results are discussed in the light of the relevant literature. Isotope nephrography appears to be a satisfactory screening test for evaluation of renal function on each side.
Clinical, radioanatomical, and therapeutic aspects of dural arteriovenous malformations in the region of the transverse sinsu are discussed on the basis of seven personal observations and the analysis of 72 reported cases. Common symptoms are headache and troublesome tinnitus aurium. More serious neurological deficiencies may occur as a result of distrubance in cerebral hemodynamics. A complete neuroradiological investigation is essential for adequate treatment. Most frequent arterial feeders are the occipital, tentorial, and middle meningeal arteries. Ligation of the occipital artery is not sufficient in most cases. Operative isolation of the transverse sinus by craniotomy and dural section is considered by far the most successful treatment and should be performed whenever ligations fail or are not indicated.
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Follow-ups in 21 patients with 30 fractures of the lower jaw which were treated with stable plate osteosynthesis showed that 94% of the teeth adjacent to the fracture line were not extracted. The rate of secondary healing was 7%. Evaluation of the periodontal conditions showed that only 14% of the teeth were not worth keeping and 45% of the teeth required treatment. It is pointed out that when treating mandibular fractures with stable plate osteosynthesis, retention of the teeth in the fracture line does not mean an increased risk as far as secondary healing and the tooth itself are concerned.
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The renal function of a total of 137 women without renal diseases taking contraceptive steroids continuously but for different periods of time (up to a maximum of 8 years) was investigated by isotope nephrography. Checking is done by using the semiquantitative evaluation prameters according to Zum Winkel. The results show that the application of hormonal contraceptives does not induce significant changes of renal function in the isotope nephrogram.
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In 2 series of investigations could be established that there exist relations between the radiocardiographically determined stroke volume and minute volume in rest and the maximum receptivity of oxygen and that the effect of a digitalisation is to be judged according to the increase of stroke and minute volume in rest and under load. The values obtained by the use of 113m indium allow an evidence concerning the functional capacity of the heart. A clear reduction of the stroke volume correlates with a diminution of the maximum oxygen pulse established during an ergometric examination and the maximum receptivity of oxygen.