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Biomedical subjects

M G Bogaert

Publications and source records attributed to M G Bogaert.

At least 19 recordsLinked to original sources
PubMed1979

Simultaneous determination of isosorbide dinitrate and its mononitrates in human plasma by capillary column GLC.

A previously described electron-capture GLC method for determination of isosorbide dinitrate in human plasma was adapted for the simultaneous determination of isosorbide dinitrate, isosorbide 2-mononitrate, and isosorbide 5-mononitrate using a capillary column. Quantitation was done with two internal standards. The lower limits of detection were approximately 0.5 ng/ml of plasma for isosorbide dinitrate, 2 ng/ml for isosorbide 2-mononitrate, and 20 ng/ml for isosorbide 5-mononitrate.

Biotransformation↗
PubMed1978

Quantitative GLC determination of cis- and trans-isomers of doxepin and desmethyldoxepin.

A GLC method for the simultaneous quantitative determination of the cis- and trans-isomers of doxepin and desmethyldoxepin in human plasma was developed. The method involves the use of a capillary column for efficient separation of the four compounds and the internal standards, amitriptyline and nortriptyline. A high sensitivity is obtained with a nitrogen detector, enabling quantitation of the compounds in plasma of humans treated chronically with doxepin. Confirmation of the identity of the cis- and trans-isomers of doxepin and desmethyldoxepin in biological samples was carried out by selected ion monitoring.

Adult↗
PubMed1978

Hypotension produced by intravenous apomorphine in the anaesthetized dog is not centrally mediated.

1 Intravenous administration of apomorphine (1.25 to 20 microgram/kg) in the anaesthetized dog produced a dose-dependent decrease in blood pressure which was antagonized by haloperidol but not influenced by propranolol or atropine. 2 Intracarotid administration of apomorphine produced a systemic hypotension which was significantly smaller than that seen with intravenous injection. 3 Doses of apomorphine that caused a decrease in blood pressure on intravenous injection, had no effect on blood pressure or caused retching accompanied by an increase in blood pressure on intravertebral or intracisternal administration. The animals showed a marked hypotension on intravertebral or intracisternal injection of clonidine. 4 From these results it is concluded that the hypotension seen with intravenous apomorphine cannot be explained by a central site of action.

Animals↗
PubMed1978

Metabolism of papaverine IV. Urinary elimination of papaverine metabolites in man.

1. A gas chromatographic method is described for the quantitative determination of the metabolites of papaverine in urine. 2. The urinary excretion of papaverine metabolites was studied in man. About 50% of the metabolites of papaverine are excreted in the urine within 48 h. 6-Desmethylpapaverine is the major metabolite in the urine. The metabolites are excreted almost completely in conjugated form.

Biotransformation↗
PubMed1977

Influence of acute renal failure on the protein binding of drugs in animals and in man.

Serum protein binding of phenylbutazone has been measured in the rat, guinea pig, cat, rabbit and dog, and the influence on it of renal failure induced by uranyl nitrate injection has been studied. In all speciies a clearcut decrease in binding was observed after the occurrence of renal failure; the time course of the fall in binding correlated well with development of renal failure. In further experiments, serum protein binding of two acidic drugs (phenylbutazone, warfarin), two basic drugs (papaverine, quinidine) and one neutral drug (digitoxin) was studied in rabbits with experimental renal failure, and the results compared with those obtained in patients with acute renal failure. In the rabbits, a decrease in the binding of phenylbutazone, warfarin, papaverine and quinidine was found, whereas protein binding of digitoxin was unchanged. In man, there was a definite fall in protein binding of phenylbutazone and digitoxin, a small decrease for warfarin and papaverine, and a slight increase for quinidine.

Acute Kidney Injury↗
PubMed1977

Effect of beta-adrenergic blockade on blood pressure variation in patients with moderate hypertension.

The effect of beta-adrenergic blockade on blood pressure variation was studied in ten patients with moderate hypertension. Supine systolic and diastolic blood pressures were measured every 5 min during six hours sessions, using an ultrasonic method. Systolic and diastolic variation in each six hour session was defined as the standard deviation of the mean of systolic and diastolic readings made in that period. After 3 weeks of single-blind placebo, a 12 week double-blind randomized crossover study was initiated with placebo (6 weeks) and atenolol (100 mg b.i.d. for 3 weeks and 200 mg b.i.d. for 3 weeks). Systolic and diastolic blood pressure and heart rate decreased significantly (p less than 0.01) during atenolol treatment. Diastolic variation did not change significantly, whereas systolic variation decreased slightly but significantly (p less than 0.05) when expressed in absolute values, but not when expressed as a percentage of systolic blood pressure. It is concluded that beta-adrenergic blockade decreases blood pressure and heart rate without causing significant changes in spontaneous systolic or diastolic variation.

Atenolol↗