Increased Antipyrine Half-Life in Women Taking Oral Contraceptives

1970 ◽  
Vol 15 (12) ◽  
pp. 454-456 ◽  
Author(s):  
K. O'Malley ◽  
I. H. Stevenson ◽  
Wilma Alexander
Keyword(s):  
Oral Contraceptive ◽  
Oral Contraceptives ◽  
Half Life ◽  
Control Value ◽  
Control Subjects ◽  
The Mean ◽  
Plasma Half Life

The plasma half-life of antipyrine has been measured in 18 women taking oral contraceptives and in 19 control subjects. The mean half-life in the oral contraceptive group of 13.2±2.0 hr. was significantly prolonged compared to the control value of 10.5±2.5 hours

scholarly journals Patterns of Granulocyte Kinetics in Health, Infection and in Carcinoma

Blood ◽  
1965 ◽  
Vol 25 (5) ◽  
pp. 683-692 ◽  
Author(s):  
PETER R. GALBRAITH ◽  
LESLIE S. VALBERG ◽  
MALCOLM BROWN
Keyword(s):  
Steady State ◽  
Half Life ◽  
Turnover Rate ◽  
Turnover Rates ◽  
Normal Range ◽  
Control Value ◽  
Control Subjects ◽  
The Mean ◽  
Blood Granulocyte

Abstract Leukokinetic studies were performed using granulocytes labeled in vitro with radioactive diisopropylfluorophosphate (DFP32). The half-time of the granulocytes in the circulation, blood granulocyte mass and granulocyte turnover rates were determined. In control subjects the mean half-life was 6.44 hours with a range of 5.1 to 7.7 hours. The mean blood granulocyte mass was 38 x 109 cells with a range of 19.9 to 36.4 x 109 cells and the granulocyte turnover rate was 4.08 x 109 cells per hour with a range of 2.51 to 5.50 x 109 cells per hour. There was a direct relationship between the half-life and the blood granulocyte mass in the control subjects. In 6 subjects with infection the blood granulocyte mass was uniformly increased. The mean half-life and mean granulocyte turnover rate were both increased above the normal range. In 11 subjects with carcinoma several different leukokinetic patterns were found. The blood granulocyte mass was raised in 5 patients, but in only one of these was the granulocyte turnover rate increased above the normal range. In 6 subjects the blood granulocyte mass was within the normal range and deviations from the mean control value were accompanied by proportionate changes in the granulocyte turnover rate in all but 1 patient. No relation was found between the half-life and the blood granulocyte mass in subjects with infection and/or carcinoma. The possibility that this was due to the establishment of a new steady state of blood granulocyte mass at altered levels of granulocyte production, or that steady state conditions did not exist has been considered. However the data are interpreted no evidence for suppressed granulopoiesis was found in subjects with advanced malignant disease.

Impairment of Antipyrine Metabolism in Urinary Tract Cancer

1983 ◽  
Vol 69 (3) ◽  
pp. 221-222 ◽  
Author(s):  
Maura Ludovici ◽  
Piero Dolara ◽  
Alfiero Costantini ◽  
Guido Barbagli ◽  
Anna Calzolai ◽  
...  
Keyword(s):  
Urinary Tract ◽  
Half Life ◽  
Clinical Parameters ◽  
Tract Cancer ◽  
Patients With Cancer ◽  
Control Subjects ◽  
Antipyrine Metabolism ◽  
Urinary Tract Cancer ◽  
The Mean ◽  
Age And Sex

The metabolism of antipyrine was studied in 13 patients with cancer and bladder papillomas and in 11 control subjects, matched for interfering factors like smoking, diet, age and sex. The mean antipyrine half-life was significantly longer in patients with urinary tract cancer (14.7 ± 1.32 h SE) than in control subjects (11 ± 0.55 h SE) (P < 0.025); other clinical parameters did not vary.

scholarly journals Oral contraceptive among risk factors for women with ischemic stroke

2021 ◽  
Vol 12 (1) ◽  
pp. 548
Author(s):  
Carla S. PALUDO ◽  
Amanda SACHETTI ◽  
Maiara S. PAIXÃO
Keyword(s):  
Risk Factors ◽  
Ischemic Stroke ◽  
Oral Contraceptive ◽  
Oral Contraceptives ◽  
Contraceptive Use ◽  
Cross Sectional Study ◽  
Mean Value ◽  
Northern Region ◽  
Cross Sectional ◽  
The Mean

Objective: To evaluate the frequency of use of oral contraceptives and other risk factors among women with ischemic stroke seen at a hospital in the northern region of the state of Rio Grande do Sul. Methods: Prospective, cross-sectional study. The population was characterized by patients admitted with a diagnosis of ischemic stroke during a period from March to August 2019 and the sample by female patients found in the population. The data were collected through an individual interview using a questionnaire developed by the researchers and tabulated for further analysis. All analyzes were performed using the statistical program Bioestat 5.0, considering p = 0.05. Results: In the characterization of the sample, an average age of 68.2 years was observed. The occurrence of gender was 52.4% for women. The mean hospital stay was 12.2 ± 8.91 days. Outcome of hospital discharge was 89.1%. The mean value of body mass index was 25 ± 4.89 kg / m², with an average of 27.4 kg / m² in patients who used oral contraceptives and 25.23 kg / m² in patients who did not use oral contraceptives. The sample had a 34.5%incidence of oral contraceptive use. The average age of those who used oral contraceptives was 62.4 years and of the patients who did not use it was 70.3 years. Conclusion: The study showed a high use of oral contraceptives in the sample, with percentage values very close to other factors evaluated, thus showing itself as a probable risk factor for the development of ischemic stroke.

The Serum Half-Life and Urine Concentrations of Cephazolin Sodium in Patients with Terminal Renal Failure: Effect of Haemodialysis

1975 ◽  
Vol 20 (5) ◽  
pp. 240-243 ◽  
Author(s):  
J. B. Eastwood ◽  
P. E. Gower ◽  
J. R. Curtis
Keyword(s):  
Renal Failure ◽  
Half Life ◽  
Dosage Schedule ◽  
Dialysis Patients ◽  
Maintenance Haemodialysis ◽  
Terminal Renal Failure ◽  
Percentage Recovery ◽  
Urine Concentrations ◽  
The Mean ◽  
Plasma Half Life

The serum and plasma half-life of cephazolin has been determined in 5 maintenance haemodialysis patients during a non-dialysis period and then again in the same patients during haemodialysis with a Meltec Maxi-Multipoint dialyser using cuprophane membranes. The mean half-life during the non-dialysis period was 28.3 hours and fell to a mean of 4.97 hours during haemodialysis. Percentage recovery of cephazolin in the urine was markedly reduced in 4 maintenance dialysis patients although adequate urine concentrations of cephazolin were achieved for many sensitive organisms. A dosage schedule for patients with creatinine clearances of less than 5 ml. per minute and for maintenance haemodialysis patients is suggested.

The Effect of Brassica Vegetable Consumption on Caffeine Metabolism in Humans

1992 ◽  
Vol 11 (3) ◽  
pp. 167-172 ◽  
Author(s):  
R.E. McDanell ◽  
L.A. Henderson ◽  
K. Russell ◽  
A.E.M. McLean
Keyword(s):  
Healthy Volunteers ◽  
Half Life ◽  
Vegetable Consumption ◽  
Interindividual Variation ◽  
Short Term ◽  
Brassica Vegetables ◽  
The Mean ◽  
Caffeine Metabolism ◽  
Brassica Vegetable ◽  
Plasma Half Life

Ten healthy volunteers were used in two studies investigating the effect of short-term Brassica consumption on caffeine metabolism. In the first study volunteers were given three Brassica-containing meals, the last one 3 h prior to caffeine administration. In the second study volunteers were given two Brassica-containing meals and then fasted overnight before caffeine administration. In both studies the mean plasma half-life of caffeine was reduced by approximately 20% following a Brassica diet, suggesting that Brassica vegetables stimulate caffeine metabolism. When caffeine was given 3 h after the last meal, plasma caffeine concentrations over 6 h, were increased by up to 27% on the Brassica diet compared to controls. This may be due to a transient increased permeability of the intestine to caffeine, immediately following Brassica consumption. This effect was not seen in the second study where there was a 12-h period between the last meal and caffeine administration. There was large interindividual variation in the effect of the Brassica diet on caffeine metabolism.

ROLE OF THE KIDNEY IN THE METABOLISM OF LUTEINIZING HORMONE

1973 ◽  
Vol 58 (3) ◽  
pp. 425-434 ◽  
Author(s):  
D. M. de KRETSER ◽  
R. C. ATKINS ◽  
C. A. PAULSEN
Keyword(s):  
Luteinizing Hormone ◽  
Half Life ◽  
Renal Excretion ◽  
Gel Filtration ◽  
Deae Cellulose ◽  
Proximal Convoluted Tubule ◽  
Bilateral Oophorectomy ◽  
The Mean ◽  
Plasma Half Life

SUMMARY Autoradiographic localization of 125I-labelled luteinizing hormone (LH) in the renal proximal convoluted tubule of rats initiated a study of the role of the kidney in the metabolism of LH. Incubation of 131I-labelled LH with rat renal homogenates for 90 min failed to destroy its immunological reactivity. The plasma half-life of 131I-labelled LH injected i.v. was investigated in normal ewes and rams. Preliminary studies indicated that the use of a preparation containing a high proportion of 'damaged' iodinated hormone could erroneously prolong the plasma half-life. Before use, 131I-labelled LH was purified by gel filtration and column chromatography using DEAE-cellulose. The mean plasma half-life of 131I-labelled LH in normal ewes was 26·7 min and was not significantly altered after oophorectomy (31·1 min). After bilateral oophorectomy and nephrectomy, marked prolongation of the plasma half-life was observed (mean 70·7 min). In normal rams, mean plasma half-life of 131I-labelled LH was 32·0 min, after orchidectomy 44·0 min and after orchidectomy and nephrectomy 82·0 min. The plasma half-life of 131I-labelled LH in a nephrectomized ewe maintained on haemodialysis was also prolonged (67·5 min), the determination being performed 24 h after the last haemodialysis. Although the kidney does not degrade LH, the plasma half-life was significantly increased after nephrectomy. This suggests that the localization of 125I-labelled LH in the proximal convoluted tubule may represent a secretory mechanism allowing renal excretion of LH.

Drug Interaction between Rifampicin and Cotrimoxazole in Patients with Tuberculosis

1991 ◽  
Vol 10 (6) ◽  
pp. 419-421 ◽  
Author(s):  
R.S. Bhatia ◽  
R. Uppal ◽  
R. Malhi ◽  
D. Behera ◽  
S.K. Jindal
Keyword(s):  
Drug Interaction ◽  
Half Life ◽  
Serum Levels ◽  
Antitubercular Therapy ◽  
The Mean ◽  
Plasma Half Life

1 Patients ( n = 15) who were admitted with complications of tuberculosis, were given antitubercular therapy (ATT) with rifampicin (RIF), for a minumum period of 15 d, and cotrimoxazole (CTZ), concurrently, for 5-10 d. 2 The serum RIF levels were measured before the start of CTZ treatment and at the end of its administration. 3 The plasma half-life ( t½) of RIF increased significantly from 1.92 ± 0.57 h to 2.31 ± 0.134 h after CTZ treatment. 4 The mean serum levels of RIF increased significantly at 4 and 6 h after CTZ administration.

scholarly journals Influence of maturation and growth on cefetamet pivoxil pharmacokinetics: rational dosing for infants.

1996 ◽  
Vol 40 (3) ◽  
pp. 567-574 ◽  
Author(s):  
W L Hayton ◽  
J Kneer ◽  
R de Groot ◽  
K Stoeckel
Keyword(s):  
Body Weight ◽  
Half Life ◽  
Pediatric Patients ◽  
Volume Of Distribution ◽  
Systemic Clearance ◽  
Older Children ◽  
Dosing Regimen ◽  
Urinary Recovery ◽  
The Mean ◽  
Plasma Half Life

The pharmacokinetics of intravenous (i.v.) cefetamet and the bioavailability of oral cefetamet pivoxil in infants aged 3.5 to 17.3 months who were hospitalized for urological surgery were characterized. The absorption of cefetamet pivoxil administered in a syrup formulation was 38 +/- 19% (n = 5) for infants, which was comparable to values observed for children and adults. The plasma half-life of i.v. cefetamet was 3.03 +/- 0.96 h (mean +/- standard deviation; n = 20) in the infants. This was not different from the value observed for normal adult subjects but was longer than that reported for children aged 3 to 12 years. Urinary recovery of cefetamet after i.v. administration to infants was 63.4 +/- 17.7% (n = 16), which was less than the 80% recovery found in older children and adults. The steady-state volume of distribution was 399 +/- 116 ml/kg of body weight. It was comparable in size and showed the same dependence on body weight as it did in children and adults. The mean systemic clearance per kilogram of body weight in the infants was lower than that in children and adults, apparently because of immaturity of clearance processes. A model that accounted for maturation and growth with increasing age was developed for the clearance. On the basis of this model, the clearance capacity increased from birth to 5 years by a factor of 4.5 because of maturation. Maturation progressed exponentially, with a half-life of 14 months. This model was used to develop dosing regimen guidelines for pediatric patients aged 3.5 months and older.

Plasma Thrombospondin as an Indicator of Intravascular Platelet Activation in Patients with Vasculitis

1987 ◽  
Vol 58 (03) ◽  
pp. 850-852 ◽  
Author(s):  
M B McCrohan ◽  
S W Huang ◽  
J W Sleasman ◽  
P A Klein ◽  
K J Kao
Keyword(s):  
Platelet Activation ◽  
Plasma Levels ◽  
Half Life ◽  
Degradation Products ◽  
Plasma Concentrations ◽  
Primary Source ◽  
Positive Correlation ◽  
Activation Marker ◽  
Fibrin Degradation Products ◽  
The Mean

SummaryThe use of plasma thrombospondin (TSP) concentration was investigated as an indicator of intravascular platelet activation. Patients (n = 20) with diseases that have known vasculitis were included in the study. The range and the mean of plasma TSP concentrations of patients with vasculitis were 117 ng/ml to 6500 ng/ml and 791±1412 ng/ml (mean ± SD); the range and the mean of plasma TSP concentrations of control individuals (n = 33) were 13 ng/ml to 137 ng/ml and 59±29 ng/ml. When plasma TSP concentrations were correlated with plasma concentrations of another platelet activation marker, β-thromboglobulin (P-TG), it was found that the TSP concentration inei eased exponentially as the plasma β-TG level rose. A positive correlation between plasma levels of plasma TSP and serum fibrin degradation products was also observed. The results suggest that platelets are the primary source of plasma TSP in patients with various vasculitis and that plasma TSP can be a better indicator than β-TG to assess intravascular platelet activation due to its longer circulation half life.

Platelet Hypersensitivity in Acute Malaria (Plasmodium falciparum) Infection in Man

1981 ◽  
Vol 46 (02) ◽  
pp. 547-549 ◽  
Author(s):  
E M Essien ◽  
M I Ebhota
Keyword(s):  
Plasmodium Falciparum ◽  
Malaria Infection ◽  
Light Transmission ◽  
Human Platelet ◽  
Platelet Rich Plasma ◽  
Wave Pattern ◽  
Falciparum Infection ◽  
Secondary Wave ◽  
Control Subjects ◽  
The Mean

SummaryDuring acute malaria infection, platelets in human platelet-rich plasma are hypersensitive to the addition of ADP between 1.0 uM and 5.0 uM, or adrenaline 0.11 uM as aggregating agents. The mean maximum aggregation amplitude (as % of light transmission) obtained from 8 subjects in response to added ADP (1.0 uM), 39.8 ± 27 (1SD), was significantly greater than the value in 6 controls (5.2±6.7 (1SD); t = 3, 51 P <0.005). A similar pattern of response was obtained with higher ADP concentrations (2.4,4.5 or 5.0 uM) in 22 patients and 20 control subjects (89.9±14.9% vs 77.8±16.5% (1SD) t = 2.45, P <0.02). Addition of 4.5 uM ADP to patient PRP usually evoked only a single aggregation wave (fused primary and secondary waves) while the typical primary and secondary wave pattern was usually obtained from controls.Mean plasma B-thromboglobulin (BTG) concentration in 7 patients (208.3 ± 15.6 ng/ml) was significantly higher than the value in 6 control subjects (59.2±15.7 ng/ml; t = 13.44, P <0.002).

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