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Biomedical subjects

S Bernasconi

Publications and source records attributed to S Bernasconi.

At least 235 records · Page 13Linked to original sources

[Treatment of diabetic ketoacidosis in children].

Two groups of children with severe diabetic ketoacidosis were treated with 2 different insulin regimens: the first with conventional intermittent intramuscular insulin injections (0.5-1.0 U/kg/3-4 hrs), the second, with continuous low-dose insulin infusion (0.05-0.1 U/kg/hr). Therapeutic effects were compared. Compared to the conventional regimen, low-dose insulin infusion showed several advantages: 1) better control of blood glucose level, 2) no risk of hypoglycemia and hypokaliemia, 3) rapid decrease of urinary ketone bodies and 4) gradual acidosis correction. When associated with a proper replacement of fluids and electrolytes, low-dose insulin infusion appeared to be a simple and effective regimen in the treatment of children with diabetic ketoacidosis.

Adolescent↗

[Concentrated radiotherapy of brain metastases].

Presentation of 60 patients with cerebral metastases irradiated with a telecobaltotherapy machine (concentrated high dose treatment) from 1976 to 1979; 47 patients fully completed the treatment: 11 patients had only one part of the concentrated treatment and 36 patients had both parts of the concentrated treatment. Of the 11 patients who received only one part of the concentrated high dose treatment (3 x 650 rads mid-line dose to the whole brain during 3 consecutive days and then, after a rest period of 3 weeks, 12 x 170 rads mid-line dose given in two weeks using classical fractionation, total dose 3990 rads), 9 (81.8%) responded favourably with average survival of 5 months. Of the 36 patients who received both parts of the concentrated high dose treatment, i.e. 3 x 650 rads mid-line dose in 3 consecutive days and then the same treatment repeated 3 weeks later. giving a total dose of 3900 rads, 31 (86.1%) responded favourably with an average survival of 5 months. This type of regimen, using the two-part concentrated high dose treatment ("split course therapy"), not only spectacularly alleviated neurological signs and symptoms but had the added advantage of appreciably reducing the patients' stay in hospital.

Aged↗

Neurochemical correlates of muricidal behavior in rats.

Surgical, pharmacological or environmental manipulation are widely employed to induce muricidal behavior in naive laboratory male rats. The genetic predisposition of an animal strain to kill mice remains, however, an important factor to obtain the muricidal reaction. Data from the pertinent literature suggest that muricidal behavior may possibly be sustained by increased dopaminergic or catecholaminergic activity in the presence of reduced serotoninergic activity. The results here presented indicate, instead, that complete abolition of brain serotoninergic control, i.e., maximal depletion of brain serotonin, is just enough per se to induce muricidal activity. Further, this chemically-induced muricidal activity goes well beyond any pre-existing strain predisposition to kill mice or not.

Aggression↗

p-Chlorophenylalanine-induced muricidal aggression in male and female laboratory rats.

p-Chlorophenylalanine (pCPA), a potent inhibitor of serotonin synthesis, specifically depletes brain serotonin in a dose-dependent manner. The resulting impairment of serotonergic inhibitory control of the brain is considered responsible for the consequent muricidal aggression that arises in pCPA-treated rats independent of their strain-dependent genetic predisposition and sex propensity to display this behavior. Judging from the data obtained, the minimal impairment of serotonergic inhibitory control required to induce consistent muricidal aggression in rats of both sexes of the strains considered, corresponds to a brain serotonin depletion of about 55-60%.

Aggression↗

[Premature thelarche and precocious puberty. Clinical findings and endocrinological data useful for differential diagnosis].

Clinical features, urocytogram and gonadotropin response to LHRH (100 microgram/1,73 m2 i.v.) were evaluated in 10 girls with premature thelarche and 4 girls with precocious puberty to purpose to describe the differences between the two diseases. The subjects with Premature Thelarche showed peculiar clinical and endocrinological characteristics which allowed their discrimination from patients with Precocious Puberty: 1) breast development of mild degree without any modification of nipples and areolae and not accompanied by pubic hair or morphologic changes of genitalia; 2) spontaneous regression of thelarche more or less complete (6/10 cases); 3) not anticipation of puberal maturation; 4) growth rate not accelerate (only a mild advancement of statural age was observed); 5) LH/FSH ratio at prepuberal levels; 6) mean LH peak values overlapping to those obtained in normal infants under 1 year of age. Our findings confirm that: 1) the girls with Premature Thelarche showed different growth pattern and clinical features than those observed in the girls with Precocious Puberty; 2) LHRH test and urocytogram are further valuable parameters for the differential diagnosis between Premature Thelarche and Precocious Puberty; 3) the isolated breast enlargement in girls under 8 years of age is likely to originate from a protracted gonadotropin hyperstimulation as in early life; 4) it is a variant of the normal, not difficult to asses, which merits, however further follow-up.

Adolescent↗

Adjuvant chemotherapy with procarbazine, vincristine and prednisone for medulloblastomas. A preliminary report.

The survival of 20 children with medulloblastoma who received adjuvant chemotherapy with procarbazine, vincristine and prednisone after resection and craniospinal irradiation is compared with the preliminary results of the Children's Cancer Study Group (CCSG) and the international Society of Pediatric Oncology (SIOP) medulloblastoma studies. Survival with the chemotherapy used in the SPOG study ws not superior to the survival of children who received craniospinal irradiation only.

Cerebellar Neoplasms↗

[Results of radio-surgical treatment of primary malignant lymphomas of the digestive tract].

In 29 patients treated in the Department of radiotherapy of the University Hospital, Lausanne, between 1963 to 1978, 18 of these lesions were localized in the stomach (1 was confined to the oesophago-gastric region), 10 in the small intestine and 1 in the rectum. The patients comprised 18 men and 11 women; the majority (21 out of 29) were over 50 years of age. Using the former histological classification, 13 patients had lymphomas of the lymphocytic type (in which 1 was a Brill-Symmers), 13 had reticulum cell sarcomas and 3 had mixed type. 28 patients had previously undergone surgery: 7 had had extensive surgery, 15 resections were classified as macroscopically tumour free by the surgeons though histologically the end of the surgical specimens was sectioned through tumour and/or regional lymphatics were positive, and 6 patients had undergone exploratory laparotomies. Radiotherapy was carried out using high energy machines in 28 of the 29 patients (i.e. telecobalt therapy and a betatron) and in the remaining patient a 200 kV conventional therapy machine was used. 21 patients received radical radiotherapy (in 15 patients the irradiation was confined to the tumour bed and the regional lymphatic ganglia, 1 patient was treated over the whole abdominal cavity using various parallel opposing portals, and 5 patients were treated by the moving-strip technic). In 8 patients the treatment was considered incomplete. The patients who were treated radically received doses of 4000-4500 rads in 5 weeks to the tumour bed and the regional lymphatic ganglia, and 2000-2500 rads in 5 weeks when the moving-strip technic was used and when the whole abdominal cavity was treated. Seven patients also received chemotherapy involving either one drug or in some cases multiple drug therapy. The best survival figures were in patients treated radically by both surgery and radiotherapy regardless of histology. The only prognostic factor was the initial extent of the disease.

Cobalt Radioisotopes↗

The Cohen syndrome: clinical and endocrinological studies of two new cases.

This report concerns two new cases of the Cohen syndrome and gives further information on the variable phenotypical pattern of the disease. The frequency of major and minor clinical signs is reviewed from all the published reports. Among the minor signs we found previously undescribed skeletal abnormalities in one of our patients. The reported delay onset of puberty, which appears to be a frequent aspect of the syndrome, seems to occur without LH and FSH deficiency, as our patients show.

Adolescent↗

Effect of different psychoactive drugs on serum and brain tryptophan levels.

A considerable amount of evidence indicates that the brain tryptophan level depends on circulating tryptophan. Changes of tryptophan concentration have also been described to modify the activity of benzodiazepines and tricyclic antidepressants. In the present study, a series of psychoactive drugs have been preliminarily screened for their activity on brain and plasma tryptophan levels. The results obtained suggest that tryptophan may be involved to varying extents in the activity of different psychoactive compounds.

Animals↗

Piracetam activity may differ according to the age of the recipient mouse.

Piracetam has bee administered to young and old mice to investigate whether the age may differently modulate the activity of this centrally acting drug. After piracetam administration, old mice showed a notably greater increase of their brain tryptophan than young animals. Furthermore, piracetam significantly improves the learning capacity of young mice, but the drug is remarkably more active in improving the performance by old mice. These facts may then suggest that this compound is especially effective in restoring the neurobiological setting of the aging brain.

Age Factors↗