Biomedical subjects
N Tryding
Publications and source records attributed to N Tryding.
More on serum LD1 activity in suspected myocardial infarction.
Explore the source record for details and available documents.
[A study of lipase, amylase and isoamylase in acute pancreatitis].
Explore the source record for details and available documents.
[The need for clinical chemistry in acute poisoning].
Explore the source record for details and available documents.
Reference values for serum components in pregnant women.
Reference values have been collected for 11 chemical blood serum components during the three trimesters of pregnancy in 100 healthy pregnant women. The results used for reference intervals are presented as 2.5, 50 and 97.5 percentiles. Especially regarding S-Albumin, S-Alkaline phosphatase and S-5'-Nucleotidase the changes were most pronounced during the third trimester. S-Gammaglutamyl-transferase did not change significantly during pregnancy. For S-Aspartate aminotransferase and S-Alanine amino-transferase there were no significant changes in the mean values during the three different trimester periods. In the third trimester the frequency distribution of the enzymes became skewed to the right, i.e. in some women the enzyme activities increased noticeably more than in others. S-Na showed a significant decrease even during the first trimester and this lowering was slightly more pronounced during the second and third trimesters. S-Ca decreased in parallel with S-Albumin concentration. The changes in S-CaAlbumin-corrected were distinctly smaller than those in S-CaTotal. Throughout pregnancy, S-K, S-Bilirubin and S-Thymol turbitidy test values did not deviate from non-pregnant levels.
Value of serum-5-nucleotidase, alkaline phosphatase and gamma-glutamyl transferase for prediction of liver metastases preoperatively in colorectal cancer.
In 133 patients laparotomized for colorectal cancer the serum-5-nucleotidase, alkaline phosphatase and gamma-glutamyltransferase were analysed preoperatively. The presence of liver metastases was established at laparotomy by palpation (prevalence 19%). The serum enzyme levels were elevated in 10-18% of patients without liver metastases and in 48-64% of patients with liver metastases. A comparison of the estimated tumor volume in the liver and the serum enzyme levels was performed. The predictive values of the three tests were computed at different reference limits. It was concluded that none of the tests used had any advantage of the other. To increase the diagnostic yield another reference limit than the normal at the laboratory can be used.
[Lactate dehydrogenase isoenzyme 1 and other serum enzymes in suspected myocardial infarction].
Explore the source record for details and available documents.
Serum LD-1 activity in suspected acute myocardial infarction.
We have studied the diagnostic value of measuring lactate dehydrogenase (LD) isoenzyme 1 in serum of 331 cases of suspected acute myocardial infarction (AMI). At a discriminatory level of 200 U/L (Scandinavian Committee on Enzymes, recommended method for the determination of LD) LD 1 verified the diagnosis in 96% of the AMI cases and excluded it in 96% of the not-AMI cases when samples were drawn 24-72 h after onset of pain. The correlation between 24-h S-LD-1 and 16-h S-CK B activities was 0.94 in the AMI cases. We found that quantitation of serum LD-1 is diagnostically more reliable than the serum LD-1/LD ratio.
[Can we trust the results from laboratories?].
Explore the source record for details and available documents.
False positive serum GGT tests.
Explore the source record for details and available documents.
Stability of serum and blood constituents during mail transport.
We have studied the stability of 14 serum and blood constituents after 4 days transport by mail at ambient temperature. For statistical evaluation a graphical truncated normal sequential test was used. A constituent was considered stable when the change of the mean concentration of the constituent was less than an amount equal to one standard deviation of the analytical method used, with 5% risk of error for the decision. Under these conditions 9 constituents were stable: serum albumin, creatinine, sodium, potassium, calcium, alkaline phosphatase, gamma-glutamyltransferase, blood haemoglobin and blood erythrocytes. Instability was found for serum bilirubin, blood leucocytes, haematocrit and erythrocyte volume related variables. The experimental design allows stability data to be collected during field testing by using daily runs in the laboratory. Data of this kind are essential for making a reliable laboratory service available to primary care units. The demands of the clinical situation should, however, be taken into consideration.
Propionyl-CoA carboxylase deficiency: case report, effect of low-protein diet and identification of 3-oxo-2-methylvaleric acid 3-hydroxy-2-methylvaleric acid, and maleic acid in urine.
Vomiting, lethargy and metabolic acidosis were the main initial symptoms of metabolic disease in a 1 month old girl. Her older sister had died from a similar disease, considered to be Reye's syndrome, at an age of 15 months. The urine of the present case contained 2-methylcitric acid, 3-hydroxypropionic acid, N-propionylglycine, 2-hydroxy-3-methylbutyric acid, N-tiglylglycine, 3-hydroxyvaleric acid and glutaric acid. These metabolites are all known to be associated with propionyl-CoA accumulation. Free propionic acid was not detected in the urine. In addition, the urine contained 3-oxo-2-methylvaleric acid and 3-hydroxy-2-methylvaleric acid, probably formed by condensation of two molecules of propionyl-CoA. The identity of these metabolites was confirmed by synthesis. An elevated urinary concentration of maleic acid and fumaric acid was another constant abnormality. The activity of propionyl-CoA carboxylase in leucocytes was about 20% of the normal activity. The girl was teated with a low-protein diet since the diagnosis was made at an age of 1 month, and her psychomotor development was satisfactory at an age of 2 1/2 years. She had a few episodes of acidosis during infections.
[S-GT and alcoholism-soberly considered].
Explore the source record for details and available documents.
Effects of posture on concentrations of blood constituents in healthy adults: practical application of blood specimen collection procedures recommended by the Scandinavian Committee on Reference Values.
Different procedures for the collection of blood for the determination of reference values in healthy adults have been subjected to practical testing. The Scandinavian Committee on Reference Values suggested that subjects lying in bed after an overnight sleep and ambulatory individuals, after 15 min of sitting in a chair, were two suitable and different reference populations. In forty subjects we found an increase from lying to sitting position of about 6.5% in the serum concentrations of proteins, enzymes and lipids. The corresponding increases for S-calcium and B-haemoglobin were approximately 3% whereas S-thyroxine, unexpectedly, changed by 11%. There were no significant changes of potassium and sodium values. For some constituents the changes were age and sex-dependent being greater in a group of elderly women as compared to a group of younger men. After 1 h of recumbency the concentrations of the constituents generally returned to those in the initial, lying position.
Effects of posture on concentrations of serum proteins in healthy adults. Dependence on the molecular size of proteins.
The effect of posture on changes in protein composition of serum and its dependence on molecular size has been investigated in forty individuals classified by age and sex. Blood specimens were drawn (A) at 0700 hours with persons still resting in bed after an overnight sleep; (B) at 0815 hours, in sitting position after 1 h of moderate exercise and again (C) at 0915 hours, lying in bed after 1 h of recumbency. Concentrations of alpha 1-antitrypsin, albumin and alpha 2-macroglobulin in serum were determined with high analytical precision. The mean fractional increases of concentrations from lying (A) to sitting (B) were 0.069 for alpha 1-antitrypsin and 0.063 for albumin, but lower, 0.040, for alpha 2-macroglobulin. Thus these increases, being related to molecular size, were not simply caused by posture induced changes of plasma volume. Considering the results of each individual we found a constant difference between the increase of alpha 1-antitrypsin and alpha 2-macroglobulin of about 0.030 for the whole range of increases (i.e. for alpha 1-antitrypsin 0-0.15). In contrast, the effects of recumbency were independent of molecular size. The mean, fractional decreases in concentration induced by changing of position from sitting (B) to lying (C) were approximately 0.065 for all three proteins.
Small cell carcinoma of the lung: serum calcitonin and serum histaminase (diamine oxidase) at basal levels and stimulated by pentagastrin.
Investigations were performed to evaluate the incidence of increased serum calcitonin and histaminase in 79 patients with untreated small cell carcinoma of the lung (SSC). In addition, serum calcitonin was measured following pentagastrin stimulation in 19 of these patients. Serum calcitonin was elevated in 54 of 79 patients (68%), 20 patients (25%) having a level usually associated with the diagnosis of medullary carcinoma of the thyroid (MCT). The levels of histaminase, on the other hand, did not differ from the distribution in normals. In three of 19 patients undergoing the pentagastrin stimulation test, calcitonin was significantly increased. Thus, serum calcitonin is frequently elevated in patients with SCC and a positive pentagastrin test is not pathognomonic of MCT.
[Coagulation screening: P-APT-time (APTT) -- new reagents, improved method?].
Explore the source record for details and available documents.
Date of confinement prediction from serum diamine oxidase determination in early pregnancy.
A reliable assessment of the date of confinement is often important in early pregnancy. In many pregnancies the menstrual history is in doubt or the size of the uterus does not correspond to the last menstrual period. During early pregnancy the rise of serum diamine oxidase (DAO) is confined within narrow limits to certain weeks of gestation. In a series of 189 patients from the 6th to 16th week of pregnancy, the date of confinement was estimated by enzyme determination, and was also calculated by Naegel's formula. Dating by serum DAO was found to be more accurate than the menstrual history, and this technique is recommended for use in routine clinical practice.