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Biomedical subjects

S Halvorsen

Publications and source records attributed to S Halvorsen.

At least 109 records · Page 6Linked to original sources
PubMed1981

Identification of low levels of heat labile enterotoxin in Escherichia coli from children with diarrhoea.

Out of 40 children with gastroenteritis and massive growth of E. coli in faeces, 7 yielded growth of E. coli strains producing heat-labile enterotoxin (LT), as identified by enzyme-linked immunosorbent assay (ELISA) using anticholera toxin coated plates or ganglioside coated plates. The toxin production in vitro was low, and decreased upon subculturing for 3 months in the laboratory. Only two of the strains were identified as LT-positive by the YI adrenal cell test. In addition, an LT-producing strain was isolated from an adult who had recently returned from Jordan. Sonication of the strains after subculturing released cell-bound LT. The clinical importance of such low toxin producing E. coli strains is not known.

Adult↗
PubMed1981

A study of the value of resin-embedded semi-thin sections and electron microscopy in the diagnosis of renal biopsies.

Two hundred consecutive renal biopsies originally studied by light microscopy of paraffin- and semi-thin sections and electron microscopy were reviewed and re-classified according to the proposed WHO classification for glomerular disease. The accuracy of diagnoses based on paraffin sections alone, and of those based on paraffin- and semi-thin sections were compared with the results of the final evaluation, when electron microscopy also was taken into account. Paraffin material showed a diagnostic accuracy of 59 per cent for glomerulonephritis, and 82 per cent for other renal diseases. The diagnostic accuracy of semi-thin sections was 61 per cent for glomerulonephritis and 76 per cent for other renal diseases; i.e. not improved. It is concluded that the study of semi-thin sections cannot replace electron microscopy in the diagnoses of renal biopsies. In the present study, electron microscopy altered the diagnoses in 34 per cent and yielded additional useful information in another 45 per cent of patients with glomerulonephritis. Therefore, the electron microscope should be employed routinely in the study of renal biopsies from this group of patients.

Biopsy, Needle↗
PubMed1981

A rubella epidemic in an unvaccinated pregnant population. 2. Seroepidemiology.

The study is based upon primary rubella infections detected in a collection of 7,781 serum pairs from as many pregnant women out of a total number of about 12,500 in the Oslo area of Norway in 1974. In the spring of that year, a rubella outbreak occurred. The results obtained on the serum pairs were compared and supplemented with acute serodiagnostic data obtained from the files of the virus laboratories, informations obtained from the mothers when interviewed in 1976 and from the files of application for legal abortions. From October 1973 through December 1975 a total of 118 serologically confirmed pregnancy infections were detected in the area, 94 of which took place between February and July 1974. The year following the outbreak showed scattered cases, whereas the last half of 1975 was free of cases. The pairs of the collection covered about one third of the pregnancy months occurring between February 1974 through January 1975, and the rubella infections diagnosed by seroconversion during this period indicated an attack rate for the epidemic period of 2.8% pregnancy months, and 0.35% for the post-epidemic period. 50% of the infections went unrecognised when they occurred, whereas only 17% seemed to have been subclinical. It is estimated that at least 9 children may have been born with rubella sequelae following infections during this period, when the legal abortions because of rubella in taken into consideration.

Child↗
PubMed1981

Important of HLA matching in cadaveric renal transplantation. A prospective one-center study.

Matching for the HLA-A and -B antigens was found to have a significant influence on the outcome of 459 cadaveric first transplants, with a difference in graft survival of 21% at one year between best and worst matched grafts (p = 0.003). Matching for the HLA-DR antigens seemed to have an even greater influence. In a material of 226 prospectively typed transplants, a difference in graft survival of 35% at one year between best and worst matched transplants was found (p = 0.03). In the HLA-DR matched transplants there was no significant effect of matching for the HLA-A and -B antigens. An effect of pre-transplant blood transfusions was possibly seen only in DR mismatched transplants, but the effect was not statistically significant. The results indicate that major emphasis should be placed on obtaining HLA-DR compatibility in renal transplantation.

Adult↗
PubMed1980

Importance of HLA-DR matching in cadaveric renal transplantation: a prospective one-center study of 170 transplants.

To investigate the influence of matching for HLA-DR antigens in renal transplantation, we assessed the outcome of 170 prospectively HLA-typed cadaveric kidney transplantations performed since 1977 in one center. We found a beneficial effect on graft survival of HLA-DR compatibility between donor and recipient (P < 0.05). A possible effect of matching for the HLA-A and B antigens could be seen only in the HLA-DR-mismatched combinations. Pretransplantation blood transfusions were associated with increased graft survival only in patients receiving HLA-DR mismatched transplants (P < 0.02). We conclude that major emphasis should be placed on obtaining HLA-DR compatibility renal transplantation. (N Engl J Med. 1980; 303:850-4).

Blood Transfusion↗
PubMed1980

[Gas accidents].

Explore the source record for details and available documents.

Accident Prevention↗
PubMed1980

The need of essential amino acids in children. An evaluation based on the intake of phenylalanine, tyrosine, leucine, isoleucine, and valine in children with phenylketonuria, tyrosine amino transferase defect, and maple syrup urine disease.

The diet of children with blocks in the metabolism of five amino acids has been investigated to evaluate the need for these amino acids in the maintenance of normal growth and development. Two children with phenylketonuria, one child with tyrosine aminotransferase defect and one child with maple syrup urine disease are included in the study. The growth and development of the children have been within the normal range except for language development, which was retarded in the maple syrup urine disease child. The need for phenylalanine, phenylalanine and tyrosine combined and isoleucine, leucine, and valine for protein synthesis in growing children was investigated by registering the intake of phenylalanine in the phenylketonuria children, the intake of phenylalanine and tyrosine in the tyrosine amino transferase defect child and isoleucine, leucine and valine in the maple syrup urine disease child. The significance of this intake, defined as the sufficient intake, is discussed, as well as the difference between the sufficient intake and requirement. The sufficient intake is compared with former studies on requirement. There is good agreement between the sufficient intake and requirement of phenylalanine and tyrosine. The sufficient intake of isoleucine, leucine, and valine as judged from our study is lower than in former studies on requirement.

Amino Acids, Essential↗
PubMed1980

Effect of blood transfusions on renal transplantation: study of 191 consecutive first transplants from living related donors.

One hundred ninety-one consecutive living related transplants performed from 1969 to the end of 1978 have been analyzed for the effect of pretransplant blood transfusions. Superior graft survival was observed in transfused patients transplanted with a one HLA haplotype-disparate kidney, whereas no effect of blood transfusions could be observed on the survival of HLA-identical transplants. The frequency of first rejection episodes was significantly reduced in transfused compared to nontransfused one haplotype-mismatched transplants, while no influence of blood transfusions was seen in patients with HLA-identical transplants. The survival of patients was, however, not influenced by previous transfusions. Pretransplant hemodialysis improved graft survival and patient survival; the difference was, however, only significant at 2 years in the one haplotype-mismatched group. When analyzed separately, both blood transfusions and hemodialysis had a beneficial effect on graft survival in one haplotype-mismatched transplants.

Adult↗
PubMed1980

The effect of blood transfusions on renal transplantation. Studies of 395 patients registered for transplantation with a first cadaveric kidney.

Three-hundred-and-ninety-five candidates registered for a first cadaveric renal transplant have been analyzed for the effect of pre-graft blood transfusions. Of these, 348 patients were transplanted, 45 died prior to transplantation and two patients have not yet received a transplant. Slightly less than half of the transplanted patients had been transfused, and those received five or more transfusions demonstrated a superior graft survival. This was pronounced in all HLA incompatible transplants who had received five or more transfusions. In patients who received less than five transfusions, only one-two HLA antigen incompatible transplants demonstrated increased graft survival. The frequency of rejection episodes was significantly decreased in all transfused compared to non-transfused groups. Among the patients dying while waiting for a transplant, the majority had been transfused, and a significantly higher proportion of them had cytotoxic HLA antibodies, compared to those who were transplanted.

Adult↗
PubMed1980

Non-antibody components in human milk inhibit Escherichia coli heat labile enterotoxin measured by an enzyme-linked immunosorbent assay.

Milk from 11 Norwegian women was fractionated by ammonium sulphate precipitation and column chromatography. The milk samples inhibited the binding of heat labile E. coli enterotoxin to antibodies coated on microtiter plates in an enzyme-linked immunosorbent assay. Inhibiting activity was not detected when the toxin was measured in an adrenal cell assay. The inhibiting activity was of a non-immunoglobulin nature with an apparent molecular weight of greater than 400 000 in gel filtration experiments.

Adrenal Glands↗
PubMed1980

Stones in renal transplants.

In a 50-year-old man (case 1) and a 17-year-old girl (case 2) stones developed in a functioning renal transplant. The respective intervals from transplantation to appearance of stone were seven years and six months. The serum calcium was elevated to approximately 3.00 mmol/l in case 1 and 2.65 mmol/l in case 2. The concentration of parathyroid hormone in serum was increased in case 1. Subtotal parathyroidectomy was performed in both patients, with removal of 2550 mg (case 1) and 150-160 mg (case 2) parathyroid tissue. In case 2 slight hypercalcaemia reappeared two months later. When stones in a transplanted kidney are associated with only slight hypercalcaemia and there is no deterioration of the renal function, conservative measures to reduce the serum calcium should be tried before subtotal parathyroidectomy is undertaken.

Adolescent↗
PubMed1980

HLA-DR typing and B cell cross-match tests in cadaveric renal transplantation.

Prospective HLA-DR typing and B cell cross-match tests were performed in 177 cadaveric transplants using a modified NIH technique, 24 selected HLA-DR typing sera and B cells separated from peripheral blood in recipients and from spleen in donors. Actuarial graft survival after one year was 60% in HLA-DR compatible transplants and 30% and 18% in transplants mis-matched for 1 and 2 HLA-DR antigens. The favorable prognostic influence of HLA-DR compatibility was observed both among HLA-A, -B compatible and incompatible transplants. Sharing of HLA-DR antigen(s) between donor and recipient was also prognostically beneficial. Standard cross-match tests were negative in all transplants. B cell cross-match tests were positive in 17 cases, and one of these transplants was very acutely rejected. Actuarial graft survival after three months was 35% in B cell cross-match positive grafts versus 53% in negative ones.

B-Lymphocytes↗
PubMed1980

The effect of 3-4 HLA-A and -B antigen mis-matched cadaveric kidney transplants on graft and patient survival.

During the period 1969 to 1978 survival of recipients of 1st cadaveric renal grafts improved. This improvement occurred in spite of a sharp increase in high risk patients accepted for transplantation, including patients with high age, diabetic nephropathy and advanced arteriosclerotic disease. In the same period 1st graft survival decreased. The declining graft prognosis was related to the acceptance of 3-4 HLA-A and B incompatible grafts from 1973 onwards. Grafts with 0-2 incompatibilities had a stable survival during the whole 10-years period. The group of patients receiving grafts with 3-4 incompatibilities, however, included significantly more patients with diabetic nephropathy and age above 55 years. Further analysis demonstrated that the inferior graft prognosis was caused by a combined effect of HLA-mismatched grafts and the number of high risk patients. The distribution of antibodies at retransplantation (2nd graft) was similar whether the lost 1st graft was compatible for 0-2 or 3-4 HLA antigens. Also the prognosis of retransplantation was similar in the two groups.

Adult↗
PubMed1980

Effect of blood transfusions on first cadaveric graft and uremic patient survival.

The 404 cadaveric first transplant candidates registered in Norway at the end of 1977, have been analyzed for blood transfusions; 346 of these patients have been transplanted, 45 died prior to transplantation, while 4 patients have not yet received a transplant and 9 were excluded from the analysis. Slightly less than half of the transplanted patients had been transfused, and these demonstrated significantly better graft survival, most pronounced in those receiving 5 or more transfusions. The majority of the patients dying while waiting for a transplant had been transfused, and in these also a significantly higher frequency of cytotoxic HLA antibodies was observed. All 4 still waiting patients are transfused and have multispecific antibodies. The increase in graft survival after blood transfusions was most pronounced in 1-2 HLA incompatible transplants, less in 3 and 4 antigen incompatible transplants, and no increase was seen in compatible transplants. When analyzing for rejection episodes, however, significant decrease was seen in all transfused groups compared to non-transfused.

Adult↗
PubMed1980

Effect of pre-transplant blood transfusions and haemodialysis on the survival of first kidney grafts from living related donors.

The influence of pre-transplant blood transfusions and haemodialysis has been analyzed in 191 consecutive living related first transplants. A significantly increased graft survival was seen among patients having received blood transfusions and transplanted with a 1 haplotype disparate kidney, while no effect could be observed in HLA-identical transplantations. No significant effect could be detected on recipient survival. Four patients to receive 1 haplotype mis-matched grafts were sensitized against their potential donors by transfusions, and therefore not transplanted with living related donors. The frequency of first rejection episodes was highly significantly reduced in transfused compared to non-transfused 1 haplotype mis-matched transplanted patients while no influence was seen in identicals. Pretransplant haemodialysis improved graft survival, the difference was, however, only significant in the 1 haplotype mis-matched group. When analyzed for patient survival, the difference between the pre-dialytic patients and those on haemodialysis was even more pronounced. When analyzed separately, both blood transfusions and haemodialysis had a beneficial effect on graft survival.

Adult↗
PubMed1980

Renal transplantation in polycystic renal disease--a joint Scandinavian report.

During the period 1965-1977, a total of 339 patients with polycystic renal disease received at least 1 renal transplant at one of 10 transplant centres in Scandinavia. Patient survival at one year was 67%. The one year graft survival of 319 cadaveric grafts was 40%. The average age of the patient was 56.7 years. Patients who were 60 years or older (93 patients) had a significantly poorer patient and graft survival at one year (50% and 29.5% respectively). Patients receiving kidneys with O incompatibilities did significantly better than other donor-recipient combinations. Previous blood transfusions were associated with better graft prognosis, though the difference was only significant for 2 years. The incidence of posttransplant urinary tract infection (present in 47% of all the patients) was twice as common in patients with a history of pretransplant urinary tract infection (seen in 41% of all the patients). There was no association between posttransplant septicaemia and either pre- or post-transplant urinary tract infection. Only 10.5% of the patients were nephrectomized at the time of transplantation, half of these had urinary tract infection. Twenty-four per cent of the patients were nephrectomized in the posttransplant period, half of these because of infection. There was no difference in the graft survival data of the patients with or without pretransplant urinary tract infection. These findings justify a restrictive practice with regard to pretransplant nephrectomy in patients with polycystic renal disease.

Blood Transfusion↗