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Biomedical subjects

K Lenz

Publications and source records attributed to K Lenz.

At least 163 records · Page 9Linked to original sources
PubMed1981

Effects of thiazide diuretics on plasma lipids and lipoproteins in mildly hypertensive patients: a double-blind controlled trial.

A blood lipid-lipoprotein elevating effect of the diuretics hydrochlorothiazide and chlorthalidone in mildly hypertensive men has been established by a cross-over, randomized controlled trial, confirming previous clinical observations. Compared to baseline, plasma total cholesterol increased 6% and 8% and triglycerides 17% and 15% under treatment with hydrochlorothiazide and chlorthalidone, respectively. A cholesterol-lowering diet largely prevents this increase. Because these effects may be long-lasting and may cancel part of the potential benefit of blood pressure control in mildly hypertensive patients, with thiazide diuretics attention should be given to prescription of a cholesterol-lowering diet and to periodic monitoring of blood lipid levels. Different antihypertensive agents might be considered in patients with elevated blood lipid levels. Other antihypertensive agents currently in use need to be studied for potential effects on lipid metabolism.

Adult↗
PubMed1981

[Infection in patients with hepatic coma (author's transl)].

66 patients with hepatic coma were treated from 1972 to 1979 in the intensive care unit. Incidence and etiology of bacterial infections in these patients were evaluated retrospectively. Bacterial cultures were positive in a high proportion of the cases investigated as compared to the situation on a normal ward. Bacterial cultures were performed in 51 patients (77.3%); cultures from 35 patients were positive. Gramnegative bacteria accounted for 56.4%, grampositive bacteria for 34.8% and candida albicans for 8.8% of all the cases. It is pointed out, that invasive diagnostic and therapeutic manoeuvers in intensive care patients carry a high risk of infection.

Adolescent↗
PubMed1981

[Accidental ingestion of corrosives by children (author's transl)].

Data of the Poison Information Center in Vienna and analysis of the literature indicate: 1) Accidental ingestion of corrosives by children occurs frequently, but rarely causes dangerous complications or sequelae (edema of the larynx, perforation and stricture formation in the esophagus or stomach). This is in contrast to attempted suicides by adults. 2) The first and most important step after the accident is the intake of copious amounts of water. The dangers of neutralizing acid or lye are discussed. 3) Only symptoms and signs, not kind or pH of the caustic agent afford a reliable guide for deciding whether or not the child needs further observation and treatment. This paper deals with first aid measures only, not with further treatment (e.g. shock treatment, prophylaxis of stricture formation etc.).

Burns, Chemical↗
PubMed1980

Low vitamine A and zinc concentrations in Mexican-American migrant children with growth retardation.

Nutritional evaluations were undertaken on 102 Mexican-American preschool children who were below the 3rd percentile for height, weight, or head circumference. Serum vitamin A concentrations were low in 36 of 102 children (35%). Hair zinc concentrations were low in 28 of 96 children (29%) and plasma zinc concentrations were low in 35 of 94 children (37%). Children with only low height had a mean hair zinc level of 87.5 microgram/g, whereas those with only low weight had a mean level of 108.6 microgram/g and those with only low head circumference had a mean level of 100.1 microgram/g. There was no correlation of height percentiles with plasma zinc, hair zinc, or serum vitamin A. However, further studies are needed to determine if there is a relationship between growth retardation and zinc and/or vitamin A status in this population.

Child↗
PubMed1980

Hydralazine in arterial hypertension. Randomized double-blind comparison of conventional/Slow-Release formulation and of b.i.d./q.i.d. dosage regimens.

Blood pressure (BP) control and tolerability of three two-week dosage regimens of hydralazine--conventional hydralazine q.i.d., conventional hydralazine b.i.d. and slow-release hydralazine b.i.d--were compared in a double-blind, randomized, cross-over trial in 20 out-patients with arterial hypertension controlled with hydralazine in combination with other antihypertensive drugs. The efficacy of the treatments was assessed during the last two days of each treatment period by determination of BP and pulse rate every hour between 8 a.m. and 6 p.m. No statistically significant differences in BP and pulse rate were found between the three treatment regimens, either in the variation during the day or in the mean value for the day. There was a tendency to lowest BPs on conventional hydralizine q.i.d. and to highest on conventional hydralazine b.i.d. Mean differences in supine BP between conventional hydralazine b.i.d. and slow-release hydralazine b.i.d. were 3.2 systolic and 0.5 mmHg diastolic. In this short-term study, mean values with 95% confidence limits indicate that conventional hydralazine in a q.i.d. dosage can be replaced by the same preparation or slow-release formulation in a b.i.d. dosage. Acetylator phenotype was determined and had no significant influence on the results, although there was a tendency to more widespread variability in systolic pressure and to a lower pulse rate in fast acetylators. Unwanted effects were few and did not differ obviously between the treatments. Whether the frequency of late toxicity of hydralazine is lower with slow-release formulation remains to be evaluated in long-term studies.

Adult↗
PubMed1979

[Amanita phalloides poisoning in Austria (author's transl)].

An analysis of 28 cases of amanita phalloides poisoning serves as basis for a discussion of the clinical features and therapeutic problems involved. A critical review of recent experimental investigations in animals points to new possibilities in the treatment of amanita phalloides poisoning.

Adult↗
PubMed1979

[Forced diuresis].

Forced diuresis (FD) is a frequently used method for eliminating toxins. Its therapeutic effect has yet to be evaluated by a controlled clinical trial. In the absence of such a trial its usefulness can be judged only indirectly from urinary excretion rates. In former times the usual clinical laboratory procedures could not differentiate between the unchanged toxin and its metabolites. Using more selective methods, the discussions of the effect of FD in eliminating various drugs were renewed. The problem for the indication of FD is not only a missing knowledge about the kind and amount of the ingested drug, but also when knowing it, the missing evaluation of the effect of FD on its excretion. In such cases the pharmacokinetic behaviour of the drug can be helpful. If paying enough attention to the contraindications, to the principles of electrolyte and water balance, the complication rate is low. Many infusion regimes are proposed for this treatment, but only a standardized procedure can increase the safety and efficiency of this method. More complicated and more expensive methods should be used, when there is an intoxication with a substance of high mortality or when there is no effect of FD on eliminating the toxin.

Biotransformation↗
PubMed1978

[Poisoning in childhood--an information centre report (author's transl)].

The Poison Control Centre in Vienna registered 4018 inquires regarding possible poisoning in children over a two-year period. The peak incidence occurred in the age group between 2 and 3 years and poisoning chiefly took place in the mornings and in the afternoons, the most frequently ingested substances being household chemicals and drugs. A study in 100 households showed ignorance and carelessness in dealing with chemical substances. An analysis of inquiries concerning medicines revealed the influence of packaging and external characteristics on the frequency of poisoning with these substances. Possibilities which might be of value in the prevention of poisoning in children are discussed.

Accidents, Home↗
PubMed1977

Relation between cholic acid synthesis rate and faecal radioisotope excretion following oral administration of 14C-cholic acid.

Bile acid kinetics were evaluated after oral administration of 14C-labelled cholic acid in ten normal subjects and two patients with severe bile acid malabsorption. The faecal 14C excretion was measured during the turnover study. Cholic acid synthesis rate was significantly correlated to 14C output in stools. The faecal radioisotope excretion is recommended for detection and semi-quantitation of bile acid malabsorption.

Administration, Oral↗
PubMed1977

Bacterial flora of the small intestine and bile acid metabolism in patients with hepatico-jejunostomy Roux-en-Y.

Duodenal and jejunal bacterial flora and bile acid metabolism were investigated in 14 patients with hepatico-jejunostomy Roux-en-Y. Anaerobic culture procedures were based on the use of a glove-box with an oxygen-free atmosphere and pre-reduced, anaerobically sterilized media. Anaerobic transport was based on evacuation of atmospheric air from transport-tubes and transport-time less than 30 minutes. Bile acid metabolism was evaluated from concentrations of toal bile acids and deconjugated bile acids, glycine/taurine ratio and breath test. In 92 per cent of the patients an abnormal flora-containing anaerobic and/or aerobic bacteria was found in the most proximal part of the jejunum at the site of the entero-entero anastomosis (cf. Fig. 1 and Table 1). Total bile acid concentrations were low in half of the patients, whereas deconjugated bile acids or elevated glycine/taurine ratio was found in one patient only (cf. Table II). An abnormal breath test was found in 5 patients, but without any clear correlation between the breath test and the bacterial flora.

Adult↗
PubMed1976

Bile acid metabolism and vitamin B12 absorption in ulcerative colitis.

Bile acid and vitamin B12 malabsorption were evaluated in 34 cases of ulcerative colitis. Twenty-four patients were non-operated and 10 patients were colectomized. The postprandial duodenal bile acid concentration was abnormally low in 13 of 24 non-operated cases and found to be correlated to the activity of the disease. Two of six patients subjected to colectomy had a reduced bile acid concentration. Bile acid absorption was assessed by the cholyl-glycine-1-14C breath test combined with faecal analysis. The 14C-excretion in breath was abnormally elevated in only one of the patients in the total material. The faecal 14C-output was related to the disease activity in the non-operated group. Patients colectomized for ulcerative colitis had an extremely high excretion of isotope in the ileal effluent, from 15 to 81 per cent of the dose given. The faecal 14C-output was correlated with the duration of the ileostomy and the mass of ileal discharge. Vitamin B12 malabsorption was only present in five patients. It is concluded that patients with ulcerative colitis during the active phase of the disease have bile acid malabsorption, and patients colectomized for ulcerative colitis have an abnormal high bile acid deconjugation in the ileal effluent.

Adolescent↗