Search PubMed⌕ Search

Biomedical subjects

B S Lindberg

Publications and source records attributed to B S Lindberg.

At least 37 records · Page 2Linked to original sources
PubMed1984

11C-methionine kinetics in pregnant rhesus monkeys studied by positron emission tomography: a new approach to feto-maternal metabolism.

By use of Positron Emission Tomography (PET), dynamic studies of the metabolism within the feto-maternal unit can be performed using various tracers. Many compounds like amino acids, carbohydrates, fatty acids and drugs can be performed using various tracers. Many compounds like amino acids, carbohydrates, fatty acids and drugs can be labelled with 11C and used as tracers. 11C-labelled L- or D-methionine was injected intravenously into pregnant Rhesus monkeys. The distribution of the radioactivity in maternal muscles, aorta, placenta and the liver of the fetus was quantitatively estimated as a function of time. Simultaneously blood, urine and amniotic fluid samples were analyzed for 11C-activity. The distribution of 11C between the high and the low molecular fraction of plasma (MW greater than 5000) was studied after gel filtration. Both when 11C-L- and D-methionine were given, the radioactivity rapidly crossed the placenta and was accumulated in the fetal liver. In the 11C-L-methionine experiments, about 70 per cent of the radioactivity in plasma was found in the high molecular fraction one hour after injection. A greater part of 11C-D-compared to 11C-L-activity was excreted in the urine.

Amniotic Fluid↗
PubMed1984

Endometriosis in rhesus monkeys.

Endometriosis was present in five out of six Rhesus monkeys who had to be sacrificed because of disease in a colony of 90. The monkeys lost appetite and became constipated. The abdomen was distended and often a pelvic mass could be palpated. At autopsy, 300-500 ml of blood-stained fluid was found in the abdomen together with intestinal or pelvic endometriosis. The ethiology of endometriosis in Rhesus monkeys is unknown. The most probable explanation is intraabdominal implantation of endometrial tissue through retrograde menstruation. The lesion is rare in animals in free ranging colonies. It is not known whether this is due to a higher frequency of pregnancies in animals with free access to matings or to its consequences, i.e. more infrequent menstruations.

Animals↗
PubMed1983

Practice and patterns of estrogen treatment in climacteric women in a Swedish population. A descriptive epidemiological study. Part I.

A cohort of 23 233 women to whom estrogens had been prescribed and constituting a total material from a defined Swedish population was recruited for the purpose of conducting a prospective follow-up study of endometrial cancer. Their exposure to estrogens was studied in detail by means of a comprehensive questionnaire, which was mailed to 735 randomly selected women from the cohort and answered by 89%. This paper describes the practice of estrogen prescribing in the population and the patterns of exposure of the cohort, as estimated from the sample. Our results indicated: restrictive usage of estrogens with a marked downward secular trend in the frequency of prescriptions; short duration of treatment and frequent temporary interruptions; predominant choice of estradiol valerate compounds; preference for cyclic administration and low-strength tablets; acceptance of recommended dose levels; and adherence to a few, established indications for treatment. When compared with data from a large number of other epidemiological studies, the risk of endometrial cancer in this cohort is likely to be lower.

Adult↗
PubMed1983

Characteristics of estrogen-treated women. A descriptive epidemiological study of a Swedish population. Part II.

A cohort of 23 233 women who had received estrogen prescriptions was recruited for a prospective study of estrogen therapy and the associated risk of endometrial cancer. For a detailed study, a comprehensive questionnaire was mailed to 735 randomly sampled cohort members, and 89 per cent of them responded. Estrogen exposure and its implications were described in a preceding paper (part I). The present paper reports the distribution in the cohort sample of personal features known to be risk factors for endometrial cancer. A comparison with results from various materials derived from population-based surveys and case-control studies implied that the cohort members might have a lower proportion of nulliparity (infertility) and a somewhat higher prevalence of hypertension. Differences in the distributions of age at menarche or menopause, weight, height and prevalence of diabetes were according to these comparisons slight and probably without clinical significance. It was concluded that the prevalence of risk factors for endometrial cancer other than estrogen exposure was not higher in the cohort than in the background population. Moreover, approximately one-fifth of the estrogen takers had been freed of their risk through hysterectomies.

Adolescent↗
PubMed1981

How Swedish obstetricians manage hypertension in pregnancy. A questionnaire study.

One hundred and seventy-nine obstetricians in Sweden answered a questionnaire on the management of pregnant women with hypertension. A similar study on English practice has been published earlier. In mild hypertension, 33% of the obstetricians did not prescribe medical treatment at all, while in more severe cases almost all of them would recommend a combination of hydralazine and diuretics or betablockers. There was a considerable unanimity in the replies about what treatment a patient with hypertension could use or should stop using during pregnancy. In comparison with English obstetricians the Swedish colleagues seldom consider termination of pregnancy in hypertension during early pregnancy.

Adult↗
PubMed1980

Cesarean section in premature delivery.

Cesarean sections were performed in 24 cases before the end of the 32nd week of pregnancy. Despite the fact that the indications for the operations were severe obstetric complications, the perinatal mortality was 25%, which should be compared to 23% for all children born in Sweden at that age., 2 of the surviving children developed definite neurological sequelae, which is a lower incidence than reported for vaginal premature deliveries. The results indicate that cesarean section can be recommended even for deliveries before the end of the 32nd week of pregnancy for fetal indications such as breech presentation, premature rupture of the membranes, premature labor with rigid cervix and for fetal asphyxia.

Apgar Score↗
PubMed1980

Urinary excretion of oestriol and plasma levels of unconjugated and total oestriol during late uncomplicated pregnancy.

Plasma levels of unconjugated and total oestriol and urinary excretion of oestriol were measured in ten healthy women with uncomplicated pregnancy and with normal renal function. A significant correlation between plasma total oestriol and urinary oestriol was found in five out of ten patients and between plasma total and unconjugated oestriol in only four of ten patients. When the data from the ten patients were combined there were significant correlations between urinary oestriol and the two plasma oestriol species as well as between plasma unconjugated and total oestriol. The mean urinary oestriol excretion correlated significantly with the mean urine volume. No significant correlation was found in the individual subjects between oestriol clearance and creatinine clearance, but the combined data from the ten patients yielded a highly significant correlation. The differences within or between days was highest for plasma unconjugated oestriol and lowest for urinary oestriol/mmol of creatinine. Over a three to four day period, a drop of 20 per cent in urinary oestriol/mmol of creatinine, 25 per cent in urinary oestriol/24 hours, 35 percent in plasma total oestriol and 40 per cent in plasma unconjugated oestriol do not necessarily indicate fetal danger.

Creatinine↗
PubMed1979

Determination of Leb-active oligosaccharides in urine of pregnant and lactating women by radioimmunoassay.

Antiserum obtained by immunizing a goat with lacto-N-difucohexaose I, a Leb blood-group hapten, coupled to poly-L-lysine was used in a radioimmunoassay to detect Leb-active oligosaccharides (chiefly lacto-N-difucohexaose I) in urine of 138 pregnant and lactating women of different ABO and Lewis blood groups. Specificity of the method was determined by comparing inhibitory activities of 18 oligosaccharides. Only women who belonged to the Leb blood group excreted Leb-active oligosaccharides in urine. Leb-active oligosaccharides increase during pregnancy, reaching levels up to approximately 70 mumol lacto-N-difucohexaose I equivalents per pmol creatinine in the third trimester and early post-partum period. Excretion varies considerably but tends to be highest in those individuals who strongly express the Leb antigen on their red blood cells or who belong to blood group O. Leb-active oligosaccharides were detected in plasma of a few individuals but at concentrations 1000-fold lower than in urine.

ABO Blood-Group System↗
PubMed1979

Salt, diuretics and pregnancy.

This article reviews the homeostasis of water and salt in normal and pre-eclamptic pregnancy. During pre-eclampsia there is a decrease in circulating plasma volume, which the administration of diuretics reduces still further. There is no proof that diuretics have a beneficial effect on prevention or treatment of toxemia of pregnancy. They should thus be regarded as contraindicated, except in cases of cardiac insufficiency and certain renal diseases.

Aldosterone↗
PubMed1979

Maternal sepsis, uterine rupture and coagulopathy complicating cervical cerclage.

A previously healthy woman with a Shirodkar cerclage for cervical incompetence had a spontaneous rupture of the membranes at the 37th week of pregnancy. Three days later after a short period of weak labor pains, she developed a severe sepsis, uterine rupture and coagulopathy leading to renal failure, beta-hemolytic streptococcus group B and peptostreptococcous could be cultured from the amniotic fluid immediately after rupture of the membranes and from the uterus and placenta.

Adult↗
PubMed1978

Plasma levels of non-conjugated oestrone in high risk pregnancies.

Plasma levels of non-conjugated oestrone were measured with a radio-immunological method in women with complicated pregnancies during the last trimester. A comparison was performed between values of normal pregnancies from a previous report (3) and those of pathological pregnancies. Women with severe pre-eclampsia were found to have low values and to some extent the oestrone level could predict fetal outcome. In pregnant patients with long-standing diabetes mellitus the plasma levels of oestrone seemed to be higher than those of uncomplicated pregnancy. In women with pregnancies complicated by Rh-isoimmunization, oestrone plasma levels were similar to those found in normal pregnancies.

Antibody Formation↗
PubMed1977

Biosynthesis of the blood-group-B-specific trisaccharide in a rhesus monkey.

A Rhesus monkey, serologically grouped as B, has been shown to excrete low-molecular-weight carbohydrate material in urine closely related to that found in human urine. Galactose feeding resulted in the excretion of a trisaccharide which was shown to be identical to the trisaccharide isolated from the urine of group B humans under the same conditions. Experiments in which [14C]galactose was administered both orally and via an intestinal vein demonstrated that the intestine is the site of biosynthesis.

ABO Blood-Group System↗
PubMed1977

Quantitation of some urinary oligosaccharides during pregnancy and lactation.

The excretion rates of different oligosaccharides in the urine of two individuals, a blood group O, nonsecretor woman, and a blood group A, secretor woman, were studied at different times during pregnancy and lactation. Quantitative determinations of di-, tri-, and tetrasaccharides were performed by combined gas-liquid chromatography-mass spectrometry. Larger oligosaccharides were quantitated by their content of total hexose or 6-deoxyhexose (fucose). The urinary oligosaccharide excretion during pregnancy is detectable by the 13th week. All oligosaccharides studied increased and reached the highest levels during the last trimester. During lactation more complex excretion patterns were observed. Lactose and oligosaccharides with a lactose backbone were the most predominant compounds. Oligosaccharides with a lacto-K-tetraose or a lacto-N-neotetraose backbone were present both during pregnancy and lactation, but the former type showed a much more pronounced increase of excretion during lactation. Four oligosaccharides containing only D-glucose were found in largest amounts during pregnancy. One of these oligosaccharides, a glucose tetrasaccharide, was quantitatively determined in the urine of 13 individuals and the excretion was found to decrease 2- to 5-fold in the first week post partum relative to the last week of pregnancy. Urine from a woman whose fetus died unexpectedly in the 24th week of pregnancy was also studied. No oligosaccharides characteristic of a normal pregnancy could be detected, suggesting that at least some oligosaccharides appearing specifically during pregnancy might reflect the function of the placenta or the fetus, or both.

ABO Blood-Group System↗
PubMed1977

A radioimmunological method for oestrone. Plasma levels of non-conjugated oestrone during uncomplicated pregnancy.

A specific antiserum to oestrone has been used to develop a radioimmunoassay. No chromatographic separation step was included. A small amount of plasma (0.01--0.15 ml) was extracted once with diethyl ehter. The method was used to estimate plasma levels of non-conjugated oestrone in women during uncomplicated late pregnancy. The oestrone plasma concentrations showed a gradual increase from a mean of 4 ng/ml in the 22nd week to 11 ng/ml in the 41st week. Great individual variations were found. No systematic changes of unconjugated oestrone plasma concentrations were noticed during a 24-hour period in late pregnancy. Short term studies revealed that large and rapid fluctuations may appear in the levels of unconjugated oestrone during pregnancy.

Estrone↗
PubMed1976

Plasma and urinary oestriol during late uncomplicated pregnancy.

Plasma levels of unconjugated oestriol and urinary excretion of conjugated oestriol were measured in ten healthy women with uncomplicated late pregnancy and with normal renal function. Considerably larger differences within or between days were noted for the plasma levels than for the urinary excretion of oestriol. Significant correlation between plasma levels and urinary excretion was found in only three out of ten patients. Due to the large variations within and between days, the estimation of unconjugated oestriol in plasma might be unsuitable as a substitute for the estimation of urinary conjugated oestriol in the supervision of complicated pregnancies.

Creatinine↗