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Biomedical subjects

Y Larsson

Publications and source records attributed to Y Larsson.

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

Metabolism of 2,4'5-trichlorobiphenyl: enrichment of hydroxylated and methyl sulphone metabolites in the uterine luminal fluid of pregnant mice.

Autoradiography of 2,4',5-trichloro-[14C] biphenyl ([14C] triCB) in mice at different stages of gestation indicated a strong accumulation of radioactivity in the uterine luminal fluid at gestation day 9 and later. From day 10 an uptake of radioactivity occurred also in the yolk sac epithelium. In order to identify the suspected metabolites in the fluid pregnant mice were dosed with unlabelled triCB on gestation day 9. Gas chromatographic (GC) and mass fragmentographic (MF) analysis of extracts of uterine fluid obtained on day 12 showed that hydroxylated, methyl sulphone and conjugated metabolites were present in the fluid. The unchanged triCB could not be detected in the extracts of the fluid. The site of release of the metabolites to the fluid may be the endometrium or, possibly, the yolk sac epithelium. The mechanism behind the concentration of water-insoluble methyl sulphone and hydroxylated metabolites of triCB in an aquatic phase is discussed.

Animals↗
PubMed1982

Selective affinity of dimethyl sulphoxide (DMSO) and 2-amino-4-phenylsulphonylbenzenesulphonamide (NSD 3004) for the large intestinal mucosa of mice.

Whole-body autoradiography of 14C-labelled dimethyl sulphoxide and 35S-labelled 2-amino-4-phenylsulphonylbenzenesulphonamide revealed a selective accumulation of labelled substance in the large intestinal mucosa of mice. The mechanism of accumulation is discussed with regard to previous results on sulphone-containing compounds with tissue-specific distribution patterns.

Animals↗
PubMed1982

The incidence of diabetes mellitus in Swedish children 0-14 years of age. A prospective study 1977-1980.

This is a prospective study of the incidence of insulin-dependent diabetes mellitus (IDDM) in children 0-14 years of age, including all newly diagnosed cases in the whole of Sweden from July 1, 1977 until June 30, 1980. All 45 Swedish departments of paediatrics participated. During the three-year-period studied, 1108 Swedish children, 0-14 years of age had their onset of diabetes. That means around 369 new diabetics yearly in the age groups studied. The mean yearly incidences in the years 1977-80 were 22.6, 22.8 and 22.6 per 100000 children, respectively. Mean prevalence on June 30, 1980 and 1.48 per 1000 children 0-14 years with a wide range of 0.71-2.65. The age distribution at onset showed a gradual increase and peak incidences at 11 years of age for the girls and 4 and 13 years of age for the boys. There was a consistently higher incidence for boys in the younger age groups during the three-year-period studied. Peak incidences of new cases were reached in January, March and July through October for the age groups 5-9 and 10-14 years of age. No such seasonal variation was seen for children 0-4 years of age. The cumulative incidence of IDDM at 14 years of age was 3.2 per 1000 for the boys and 2.9 per 1000 for the girls. The degree of ascertainment in this study was 93.4%.

Adolescent↗
PubMed1981

Haemodynamic effects of withdrawal of long-term treatment with beta-adrenoceptor blocking agents in subjects with essential hypertension.

1. After 10 years of beta-adrenoceptor blockade in five female patients with essential hypertension, the beta-adrenoceptor-blocking agent was withdrawn, and the women were then followed up for 1 year, with measurements of cardiac output and peripheral resistance. 2. Blood pressure remained low during the first year after withdrawal in spite of the fact that the heart rate increased within the first few days. 3. Cardiac output was found to increase during the first year after withdrawal, although total peripheral resistance was essentially unchanged. 4. The maintenance of low blood pressure after withdrawal of the antihypertensive drug might indicate a regression of structural changes in the resistance vessels during successful long-term antihypertensive treatment. 5. Minimal resistance in hands and calves did not increase during the year after withdrawal.

Adrenergic beta-Antagonists↗
PubMed1981

Personality changes and social adjustment during the first three years of diabetes in children.

Two groups of 64 diabetic and 30 carefully selected and matched non-diabetic control children 4-17 years old were studied with regard to psychological and social adaptation. Four sets of psycho-social methods were used: (a) psychiatric assessment of the mental state, (b) evaluation of the social situation, (c) measurement of the intellectual capacity, and (d) a Rorschach test. A base-line study was done within 5 months after the onset of diabetes and a follow-up 3 years later with the same methods. The mental state was assessed with regard to 18 variables, and the Rorschach test utilized 12 variables. There were no significance differences as to mental state between diabetics and non-diabetics neither at base-line nor at follow-up. Within each group, however, the diabetics showed an increase with regard to symptoms of aggression while the non-diabetics showed a decrease in such symptoms. Diabetics with high or low glucosuria levels did not differ in this respect. When summarizing mental deviations from average in the two groups the diabetics showed more deviations both at base-line and at follow-up, and a tendency towards higher degrees of mental activity, emotional ability and social contact. In the Rorschach test the diabetics showed a higher level of anxiety concerning their own health than the non-diabetics, but there was a decrease in this variable over the 3-year period. However, in an attempt to summarize the degree of mental disturbance, as estimated in the Rorschach test, no significant differences were found between diabetics and non-diabetics. Nor were any significant differences found between the groups with regard to social problems or intellectual capacity. It is concluded that the few abnormal patterns of raction that were observed may well be explained by the traumatic experience of the onset of a serious chronic disorder such as diabetes, and that a relatively strict care given to diabetic children does not seem to disturb their own or their parents' coping ability or psycho-social adjustment. The strictness might even have a supportive effect.

Adaptation, Psychological↗
PubMed1980

Cysteine and methionine-precursors of methyl sulphone metabolites of 2,4',5-trichlorobiphenyl in mice.

In order to account for the origin of the sulphur atom in methyl sulphones derived from polychlorinated biphenyls (PCB), groups of mice were treated with 2,4'-5-trichlorobiphenyl and [35S]cysteine or [35S]methionine, respectively. Control animals received the labelled amino acids only. The radioactive substances extracted from lung tissue were characterized by partition between hexane and sulphuric acid, thin-layer radiochromatography (TLRC), gas chromatography (GC) and mass fragmentography (MF). In lung extracts of both experimental groups sulphuric acid soluble metabolites were present: Their Rf-values on TLRC were identifical with that of 4-methylsulphonyl-2,4'-5-trichlorobiphenyl and their identity was confirmed by GC and GC-MF, which also indicated the presence of a minor sulphone isomer. The study shows that both cysteine and methionine could function as donors of the sulphur atom in the methyl sulphone metabolites derived from PCB.

Animals↗
PubMed1980

Pancreatic B-cell function and abnormal urinary peptides in a boy with lipoatrophic diabetes and stenosis of the aqueduct of Sylvius.

A boy with the classical clinical manifestations of acquired lipoatrophic diabetes has been studied for 5 years from the onset of diabetes at age 13. At the age of 15 a ventriculo-cisternal shunt operation was performed because of stenosis of the aqueduct of Sylvius, followed by a dramatic improvement in his diabetic state with a decrease of the 24 hr insulin requirement from 130 to 32 units. After 12 months there was a relapse with increased insulin requirement up to the preoperative level. Pimozide treatment was given for 7 months with no effect on the metabolic derangements. Extremely high basal levels of serum C-peptide and pro-insulin were found throughout the period of observation. A further increase occurred after i.v. arginine infusion tests, indicating hyperfunctioning B-cells. Repeated screenings of peptides in the urine by sephadex chromatography revealed pathological patterns similar to those observed in patients with other hypothalamic disorders, but different from that found in the urine of patients with congenital generalized lipodystrophy. Injection into mice of peptides extracted from the preoperative urine produced an acute hyperglycemia. The mechanisms behind this hypothalamic syndrome are unknown, but it is postulated that the abnormal urinary polypeptides originate from disorganized hypothalamic centres and that these peptides may be responsible for the disturbed carbohydrate and lipid metabolism.

Adolescent↗
PubMed1980

Attitudes towards physical exercise in juvenile diabetics.

Contrary to our recommendations many juvenile diabetics are inactive and rather negative to physical exercise. We have tried to estimate the attitudes towards and motivation for regular physical exercise among juvenile diabetics by interviewing, giving questionnaires to and using a special attitude test. Different groups have been studied, the largest including 138 diabetics aged 1-21 years with age at onset between 1-16 years (7.3 +/- 4.0) and duration of diabetes 1-17 years (5.7 +/- 3.6). The results are somewhat divergent comparing different patient groups and when using different methods. Generally teenagers seem to be somewhat more negative. According to direct questions in questionnaires or interviews most patients seem to know that physical exercise is important and very few dislike this part of the treatment. However, the special attitude test reveals more mixed feelings. Many patients mean that is easy to be theoretically positive, but quite another thing to really exercise regularly. Too often physical exercise becomes a medicine instead of a natural pleasant habit. It is important that the hospital staff inform the patients without nagging, and then support and stimulate the patients, and give them adequate responsibility.

Adolescent↗
PubMed1980

Vitreous fluorophotometry in juvenile diabetes.

A group of 26 juvenile diabetics, 8-22 years old with a mean duration of diabetes of 7.8 +/- 5.7 years were examined by vitreous fluorophotometry. Eleven non-diabetic healthy individuals, 12-27 years old, served as controls. Vitreous fluorescein concentrations one hour after injection of fluorescein were higher in the diabetics than in the controls indicating an abnormal blood-retinal barrier. In diabetes beyond the partial remission period a pronounced leakage of fluorescein into the vitreous body occurred, while diabetics still in partial remission showed no such abnormal leakage. There were no significant correlations between a defect blood-retinal barrier and duration or age at onset of diabetes. Some diabetic patients showed an abnormal leakage with a duration of diabetes less than 2 years, while some other patients with a duration of more than 16 years did not have an abnormal blood-retinal barrier. The diabetics with defect blood-retinal barrier had a lower glucosuria index during the last year, indicating a more inadequate metabolic control than those patients who had a normal barrier. There was no relation between the actual blood-glucose value during the examination and abnormal leakage. In some diabetics, all beyond partial remission significantly elevated fluorescein concentrations were also found in the anterior parts of the vitreous body, indicating a break-down of the blood-aqueous barrier as well. In conclusion, vitreous fluorophotometry provides information about early, functional and possibly reversible retinal changes in juvenile diabetes. The observation that the blood-retinal barrier remained intact during the remission period supports the hypothesis that normoglycemic metabolic control is of importance for the preservation of a normal blood-retinal barrier function.

Adolescent↗
PubMed1980

Physical exercise and juvenile diabetes--summary and conclusions.

The various metabolic effects of physical exercise in ketotic diabetics, non-ketotic diabetics and non-diabetics are summarized. A favorable metabolic effect is only observed during optimal insulin administration, while in ketotic diabetics exercise may aggravate the metabolic situation. The use of exercise as a tool in the routine treatment of young diabetics is described. Activity-produced hypoglycemia should be prevented through an adequate food intake and through patient education. Regular exercise may postpone the appearance of diabetic microangiopathy.

Diabetes Mellitus, Type 1↗
PubMed1979

Social adaptation in juvenile diabetes.

A sample of 36 juvenile diabetics, age 19--28 years, and with a duration of diabetes of 14--17 years were interviewed with regard to their social adaptation. Five patients could not be traced and six patients did not want to participate. Educational and professional careers were normal. However, none had received individual diabetes-oriented vocational guidance. A majority of patients was unsatisfied with the information given at the diabetic clinics, and a negative attitude towards society and its institutions was common. Patients often felt that as children they had been neglected by the diabetic team, while their parents received all information. It is concluded that diabetic children and adolescents require continuous socio-psychological support, that psychologists and/or social workers should be permanent members of the diabetic teams, and that paediatricians should follow diabetic patients until they are fully grown up.

Adolescent↗
PubMed1979

Sensory nerve conduction velocity and vibratory sensibility in juvenile diabetics. Relationship to endogenous insulin.

Sensory nerve conduction velocity (NCV) and the vibratory sense (biothesiometry) were determined in 67 children and adolescents with insulin dependent diabetes. Age at onset of diabetes varied between 1-14 years (mean +/- S.D. 6.5 +/- 3.6) and the duration of diabetes between 4-17 years (7.7 +/- 3.4). Within +/- 3 months of the nerve function tests blood was drawn for determination of C-peptide and insulin antibodies (IgG and IRI). A low NCV (less than 50 m/s) in the sural nerve and/or an abnormal vibratory sense (greater than or equal to 1.0 microns) were found in 34 patients (50.7%). Measurable fasting serum C-peptide 0.04-0.60 pmol/ml (0.17 +/- 0.15) was found in 16 patients (23.9%). All but one patients had insulin antibodies with IgG 0.130-11.029 mU/ml (2.957 +/- 2.509) and total IRI 10-9120 muU/ml (1204 +/- 1723). In multiple regression analysis we did not find any correlation between nerve function and sex, age, or age at onset of diabetes, and there was only a weak relationship between NCV and duration. However, there was a positive correlation between NCV and C-peptide (p less than 0.001). Vibration sense was also better among patients with C-peptide (p less than 0.05). The results support the view that insulin deficiency contributes to peripheral diabetic neuropathy.

Adolescent↗
PubMed1978

The incidence of diabetes mellitus in Swedish children 1970--1975.

We report a retrospective study of diabetic children, 0--14 years of age, from seven Swedish departments of paediatrics. There were 359 new cases in the years 1970--1975. Notification suggested that there was a mean yearly incidence of 19.6 cases per 100 000 with a year to year variation of 10.0--26.4 per 100 000. Consequently about 330 new cases of childhood diabetes would be expected in Sweden every year. Incidence varied considerably between different geographical areas. The age distribution was bimodal with a main peak at about 12 years and another peak at about 7 years. There was some evidence for clustering of new cases in January and the autumn. The mean prevalence of childhood diabetes in the seven districts was 1.3 per 1 000.

Adolescent↗