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Biomedical subjects

K Irjala

Publications and source records attributed to K Irjala.

At least 163 records · Page 9Linked to original sources
PubMed1985

Beta-endorphin basal levels in hirsute women.

The basal levels of beta-endorphin were measured in 43 women with various grades of hirsutism. The degree of the hair growth, weight, body mass index (BMI), age, menstrual regularity and various androgen or pituitary hormone values were not sufficient to distinguish the patients with regard to their beta-endorphin levels. In 11 patients a clinical diagnosis of a polycystic ovarian disease-like disorder was made. The beta-endorphin values of these women did not differ from those of 10 women with adrenal hyperandrogenism or the other hirsute women with identical BMI. Plasma beta-endorphin was significantly higher in obese hirsute patients with a low testosterone/sex-hormone-binding globulin (T/SHBG) ratio than in lean, nonhirsute women with a higher T/SHBG ratio (P less than 0.02). The findings suggest a possible but complex connection of beta-endorphin with some forms of female hyperandrogenism.

Adolescent↗
PubMed1985

Metabolic response to experimental trauma: the time relation of post-traumatic protein metabolism.

The relationship between time and the post-traumatic metabolic response was studied in a commonly used experimental model of trauma. Twenty nine rats underwent laparotomy and jugular vein sham catheterization as the standard trauma. The rats were fed ad libitum and compared to pair fed controls in terms of nitrogen balance and liver protein synthesis. The pairs of rats were divided into three groups according to the duration of the experiment, which was 24 h, 48 h or 72 h. The nitrogen balance was calculated daily and the liver protein synthesis in vitro measured in 10 rats after 48 h with an asanguinous perfusion system using L-(1-C(14))-Leucine. The metabolic effect of trauma was first detected in liver protein synthesis, which was diminished in the early post-traumatic period (percentage synthesis rates: post-traumatic 34.6 +/- 10.7 and pair fed 60.4 +/- 21.3, Mean +/- SD, P < 0.05). During this period the whole body nitrogen balances were similar (post-traumatic -1.200 +/- 1.440 and pair fed -0.880 +/- 1.130, gN/kg/48 h, mean +/- SD). On the third day, the response to nitrogen intake and the nitrogen balance became significantly worse in the post-traumatic rats (post-traumatic 0.214 +/- 1.680 and pair fed 1.236 +/- 1.220, gN/kg/day, mean +/- SD). These observations suggest that, firstly, the 'flow' phase has its onset on the third post-trauma day, and secondly that trauma does decrease liver protein synthesis, and this decrease lasts at least through the 'ebb' phase. The results indicate the necessity of defining the metabolic phase in experimental studies of post-traumatic metabolism.

Journal Article↗
PubMed1985

The grade of hirsutism correlated to serum androgen levels and hormonal indices.

The degree of hair growth of 64 hirsute women was clinically graded. The patients were divided into two groups with respect to the ratio between the serum luteinizing hormone (LH) and the follicle-stimulating hormone (FSH). The two groups did not differ in terms of the grade of hirsutism, serum testosterone (T), calculated free testosterone (FTc), androstenedione (A), dehydroepiandrosterone sulphate (DHEAS), sex hormone binding globulin (SHBG), estradiol, or cortisol levels. In patients with a LH/FSH ratio of 3.0 or less (n = 49), FTc and A correlated well (rho 0.49, p less than 0.001) to the clinically graded hormonal hirsutism score, while SHBG showed an inverse correlation to it. By contrast, no correlations were found in patients with a serum LH/FSH ratio exceeding 3.0 (n = 15). Various indices for hyperandrogenism were calculated. In patients with lower LH/FSH ratio, T/SHBG, T/SHBG + A/100 and T/SHBG + A/100 + DHEAS/100 showed the best correlation with the clinically scored hair growth. These results show that correlations between hirsutism and hyperandrogenism can be demonstrated.

Adolescent↗
PubMed1985

C-peptide determination in the choice of treatment in diabetes mellitus.

The predictive value of the intravenous glucagon test in assessing the requirement of insulin therapy in diabetes mellitus was evaluated in 105 adult diabetics. Basal and stimulated C-peptide concentrations and increments of C-peptide concentration were examined separately among newly and previously diagnosed diabetics. The poststimulatory C-peptide concentration of 0.6 nmol/l (Novo, antibody M 1230) proved to be the most reliable basis for the choice of therapy. Adequate therapy could have been assessed in 70 cases (67%) without glucagon stimulation. To derive maximal information of plasma C-peptide concentrations, a biphasic scheme of the use for C-peptide determinations and glucagon stimulation is presented. Basal and stimulated C-peptide levels of insulin-requiring diabetics correlated negatively with the duration of diabetes but they did not correlate with the relative body weights. Basal and stimulated C-peptide levels of non-insulin-requiring diabetics did not correlate with the duration of diabetes, but they correlated positively with the relative body weights.

Adolescent↗
PubMed1985

Determination of theophylline in serum with the Seralyzer Aris reagent strip test evaluated.

We evaluated a new Seralyzer Aris reagent strip test (Ames Div., Miles Labs.) for the determination of theophylline in human serum. The method is based on the monoclonal enzyme immunoassay with dry reagent chemistry. The analysis is rapid and simple to perform: results are available only 5-10 min after receipt of the sample. Intra-assay precision (CV) was 2.2-3.3% (n = 15) for theophylline concentrations of 5-25 mg/L; interassay CV was 5.9% (n = 19) at 15 mg/L. The results (y) agreed well with those by liquid chromatography (x): r = 0.949 (p less than 0.001), and y = 0.967x + 0.214. We conclude the method is useful for rapid evaluation of theophylline concentrations in asthmatic patients.

Antibodies, Monoclonal↗
PubMed1985

Determination of thyrotropin in serum by time-resolved fluoroimmunoassay evaluated.

We evaluated a new, highly sensitive time-resolved fluoroimmunoassay for thyrotropin (TSH) in serum. This direct immunometric "sandwich"-type assay involves two monoclonal antibodies against TSH, one immobilized, the other labeled with europium. Extremely high specific activity of the label and the use of labeled antibody in large excess make the method sensitive enough to measure TSH values falling below the normal reference interval. The standard curve is nearly linear over a wide range of TSH concentrations (standard concentrations range from 0.25 to 324 milli-int. units/L). The lowest concentration detectable was 25 micro-int. units/L. The CV for the assay was less than 6% at 0.5 milli-int. unit/L or higher, 11.3% at 0.1 milli-int. unit/L. For a CV of 10% the lower limit of the working range would be around 0.1 milli-int. unit/L. The interassay CV was 6.7 to 11.8% for TSH concentrations of 0.31 to 19.6 milli-int. units/L. The 95% confidence interval for sera from 111 healthy persons was 0.6-3.8 (range 0.3-3.8) milli-int. units/L. For hyperthyroid patients and thyroid cancer patients treated with thyroxin after thyroidectomy, serum TSH values were all below the reference interval (most were less than 25 micro-int. units/L).

Adult↗
PubMed1984

Acute effect of exogenous thyroxine dose on serum thyroxine and thyrotrophin levels in treated hypothyroid patients.

Acute effects of exogenous thyroxine on the serum thyroxine (T4), free thyroxine (FT4) and thyrotrophin (TSH) levels were studied in 20 hypothyroid women during the long-term maintenance therapy. All patients were euthyroid by clinical and laboratory parameters (T4). In nine patients TSH secretion was totally suppressed (less than 1 mu/l) by the mean dose of 178 micrograms thyroxine. Eleven patients had TSH values greater than 1 mu/l. Their mean thyroxine dose (132 micrograms) was not significantly lower than that which totally suppressed the TSH secretion. Ingestion of thyroxine resulted in maximal T4 and FT4 levels at 2 h after taking the drug. Simultaneously TSH concentration reached its minimum. The results indicate that it is necessary to know when the patient has taken the thyroxine in relation to determination of T4, FT4 and TSH levels in order to make the right decisions about the substitution dose of thyroxine. Thus it is essential to take blood sample for hormone determination before the patient ingests the daily thyroxine dose. However, among hypothyroid patients substituted by thyroxine there are individuals whose TSH secretion is not suppressed by normal T4 and FT4 levels.

Adult↗
PubMed1984

Turbidimetric measurement of Bence-Jones proteins using antibodies against free light chains of immunoglobulins. An artifact caused by different polymeric forms of light chains.

The different polymeric forms of free kappa and lambda light chains from urines of two myeloma patients were separated by gel filtration. When samples containing kappa chains in equal protein concentration were quantified by turbidimetry with anti-free kappa chain antibodies, two out of three samples reacted much less sensitively than the third sample. When analysed with SDS-polyacrylamide gel electrophoresis in conditions dissociating non-covalent but not covalent linkages, these two samples contained monomeric light chains, whereas the third sample contained dimers.

Antibodies↗
PubMed1982

Protein binding of doxepin and desmethyldoxepin.

The protein binding of doxepin (DOX) and desmethyldoxepin (DDOX) were studied in serum and plasma samples from healthy volunteers and psychiatric patients. Binding was measured by equilibrium dialysis (16 hrs at 37 degrees) and drug concentrations by radioimmunoassay. In addition, albumin and alpha 1-acid glycoprotein concentrations of the samples were measured by radial immunodiffusion. The mean +/- SEM percentages of unbound DOX were: 20.4 +/- 1.2 and 15.9 +/- 1.2 in healthy subjects (n = 16) and patients (n = 15) respectively, and those of DDOX: 21.4 +/- 0.9 and 19.0 +/- 1.4 for healthy subjects and patients, respectively. There was a significant negative correlation between serum alpha 1-acid glycoprotein concentration and free fraction of DOX in both groups. In healthy subjects a significant negative correlation was also found between albumin concentrations and free fraction of both DOX and DDOX. Binding experiments with isolated protein fractions revealed that all of the total binding in plasma could be explained by binding to albumin and alpha 1-acid glycoprotein. The observed 2--4-fold interindividual variability in the free fractions of these drugs is probably less important than the much larger variability in the total serum concentrations.

Anticoagulants↗
PubMed1982

Changes in hormonal excretion and urinary flow rate during CPPV and CPAP in healthy volunteers.

In healthy volunteers plasma antidiuretic hormone level, renin activity, and human growth hormone level remained unchanged during successive CPPV, CPAP, and control periods. The plasma level of insulin C-peptide was higher during CPPV than during the control period. Urine flow, glomerular filtration rate, free water clearance, and sodium excretion rate were lower during CPPV than during the successive CPAP and control periods. The renal function changes during CPPV may be a consequence of diminished cardiac output.

Adult↗