Search PubMed⌕ Search

Biomedical subjects

H E Solberg

Publications and source records attributed to H E Solberg.

At least 37 records · Page 2Linked to original sources
PubMed1990

Moderate cold exposure in the Faroe fishing industry.

Differences in female workers' finger temperatures, manual dexterity, ratings on thermal comfort, and local cooling exposure were studied in three factories in the Faroe Island fishing industry. Environmental temperatures in the factories varied from 5 to 19 degrees C with vertical gradients of 7 degrees C/m, and the mean temperatures of the flushing water varied from 2 to 15 degrees C. Finger temperature varied from 12 to 24 degrees C when measured 2 min after work was stopped, and about one-third of the women experienced thermal discomfort in the fingers during work. The fish temperature increased, on the average, less than 1 degrees C during passage through the production room, notwithstanding the thermal differences among the factories. These findings should be used in attempts to reduce the cold exposure of the workers; but also improved control should be recommended for both environmental and water temperatures in the factories.

Adult↗
PubMed1989

Reference values.

Explore the source record for details and available documents.

Blood Chemical Analysis↗
PubMed1987

Circulating secretory immunoglobulins of the A and M isotypes in chronic liver disease.

Serum levels of secretory IgA (SIgA) and secretory IgM (SIgM) were quantified by an enzyme-linked immunosorbent assay in 97 patients with various chronic liver diseases and 17 patients with uncomplicated ulcerative colitis. The values obtained were compared with 89 matched controls and related to other serum variables. All types of liver disease had elevated median levels of serum SIg. Patients with primary biliary cirrhosis (PBC) had the highest SIg levels, particularly SIgM, but increased total serum IgM was slightly more specific for PBC. Thus, the SIg levels did not add more discriminative information than several other variables. Elevated levels of circulating SIgA correlated mainly with variables that indicate reduced liver function. The difference observed between patients with PBC and primary sclerosing cholangitis (PSC) in the alkaline phosphatase (ALP)-to-SIg ratio is discussed.

Alkaline Phosphatase↗
PubMed1986

Statistical treatment of reference values in laboratory medicine: testing the goodness-of-fit of an observed distribution to the Gaussian distribution.

During the preparation of an IFCC-recommendation on the statistical treatment of reference values, five tests of the goodness-of-fit of an empirical distribution to the Gaussian distribution were computerized and studied by Monte Carlo simulations: tests based on the coefficients of skewness and kurtosis, the Anderson-Darling's test, the Cramér-von Mises' test, and the Kolmogorov-Smirnov's test. Approximations for test probabilities were developed for all these tests. Based on the simulation results it is recommended to use the combination of the two coefficient-based tests for monitoring the transformation of an empirical distribution to Gaussian shape and to use the Anderson-Darling's test as an all-round test for Gaussianity.

Biometry↗
PubMed1985

Follow-up and prospective studies of the classification of liver disease.

Two hundred patients with different liver diseases were observed during a period of 6-8 years. The diagnosis at the first hospitalization was based on morphological criteria (and, in some cases, additional clinical information). In 162 of the cases an initial 'specific' diagnosis could be made. By the time of the follow-up study the diagnosis was confirmed in 73% of them. In 22 of 38 patients who were initially unclassifiable, the diagnosis was made definite by the follow-up study. Eighty-five patients were hospitalized for re-examination 6-8 years after the initial study. Several of the liver diseases initially had quite typical patterns of clinical chemical data. Allocation by discriminant analysis was therefore in good agreement with the morphological classification. The follow-up study showed that several patients with initially atypical patterns of clinical chemical results had their diagnosis changed. In 35 patients with the final diagnosis of chronic active hepatitis (CAH) or primary biliary cirrhosis (PBC), laboratory data from the last hospitalization were used for discriminant analysis with teaching data from the initial study. Ninety-seven per cent were correctly allocated, and we conclude that these patients retain recognizable patterns of laboratory results for several years, even when given immunosuppressive treatment. The potential clinical usefulness of discriminant analysis of laboratory data for differential diagnosis was evaluated by a prospective study of 65 patients with the morphological diagnosis of CAH or PBC. Correspondence with the morphological classification system was found in almost 90% of the cases.

Chronic Disease↗
PubMed1984

Incorporation of precursors into sterols and proteins in liver biopsies from patients with liver disorders.

Incorporation of 14C-acetate into 3-beta-OH sterols and of 3H-leucine into proteins was examined in liver biopsies from patients with liver disorders. Biopsies obtained from patients in whom no liver disease was found served as controls. Reduced 14C-acetate incorporation into sterols was found in biopsies from patients with chronic active hepatitis and primary biliary cirrhosis. Stimulated incorporation of 3H-leucine into proteins was demonstrated in patients with alcoholic liver cirrhosis and in patients with ulcerative colitis associated with liver disease. No correlation could be established between serum proteins and lipids, respectively, on the one hand, and between incorporation of precursors into proteins and sterols, on the other. 'Incorporation parameters' were also inferior to conventional liver tests when used in the differential diagnosis between different liver disorders by discriminant analysis. Our findings may suggest, however, that hepatic sterol synthesis is frequently decreased in patients with chronic active hepatitis and primary biliary cirrhosis.

Adult↗
PubMed1984

Nordic surveys of analytical quality in clinical chemistry laboratories.

The design of the 1979 revision of the Nordic interlaboratory survey of analytical quality is described. Two Nordic surveys have been run with the new scheme (in 1979 and 1980). State of the art data (intralaboratory imprecision and total variation) is presented and compared with previous Nordic survey results and with analytical goals (Aspen). The analytical bias of sodium, potassium, chloride, creatinine, urea, glucose, and cholesterol was estimated by comparison with highly accurate reference methods (neutron activation, isotope dilution mass spectrometry).

Analysis of Variance↗
PubMed1984

Monitoring long-term analytical quality by computerized combined Shewart-cusum method.

A computerized system for monitoring the long-term analytical quality has been developed. Input to the system is the control result obtained from a single analysis of a control specimen each day a test is run. To ensure comparability with random patient's specimens, lyophilized sera are reconstituted with variable (and secret) volumes of water for most tests included in the monitoring system. The control results are evaluated by a combined application of the Shewart control rule (limits at +/- 2 SD and +/- 3 SD) and decision limit cusum control, sensitive to imprecision and inaccuracy, respectively. Four years experience with the system is presented.

Blood↗
PubMed1982

Diagnostic and prognostic value of laboratory tests assessed in a follow-up study of 200 patients with liver disease.

Two hundred patients with liver disease were re-studied after six to eight years. The initial routine diagnosis (mainly based on morphological criteria) was confirmed in almost 80% of cases of chronic liver disease. In chronic active hepatitis, agreement was found in 86%. An alternative classification based on cluster analysis of clinical chemical results from the first admission was also to a great extent confirmed by the follow-up study. Discriminant analysis of clinical chemical data correctly allocated 94% of patients with alcoholic cirrhosis (who had low haptoglobin and albumin) into groups with different prognosis. Clinical chemical results differed between verified and non-verified cases of primary biliary cirrhosis. By retrospective examination , we found that 15 of 16 patients with this disease or chronic active hepatitis who were initially misclassified by biopsy findings could be correctly diagnosed by discriminant analysis of clinical chemical results.

Biopsy↗
PubMed1981

Free thyroxine, thyroxine/TBG ratio and other in vitro tests of thyroid function evaluated by discriminant analysis.

T4, T3, TSH, FT4 (Corning method), TBG, T3U and a diversity of free thyroid hormone indices were determined in serum from 72 reference persons and 337 patients with either thyroid diseases, TBG abnormalities, non-thyroid illnesses, or medications known to affect the results of thyroid function tests. Ninety-six per cent were 20 years or older. None of the laboratory parameters showed significant age or sex dependence, whereas systemic illness and medications frequently influenced test results. Thus the mean values of all patient groups differed significantly from those of the reference group in two or more laboratory tests, and significantly from those of the reference group in two or more laboratory tests, and significant differences were detected in 73% of the total number of 209 paired comparisons of test results between reference and patient groups. As a single parameter, free thyroxine index was found to be a marginally more efficient thyroid function discriminator than FT4, which again was more efficient than the T4/TBG ratio. However, non of these parameters were included in the combinations of laboratory tests identified as optimum by discriminant analysis. The overall optimum test combination was T4, TSH and T3U, which had an efficiency for correct thyroid function reclassification better than 98% in the total material. T3 replaced TSH in distinguishing between hyperthyroidism and euthyroidism.

Adolescent↗