Biomedical subjects
Publications and source records attributed to H Kentrup.
The case of a small girl is reported who after a head injury showed radiologically two fractures of the skull whereas the bone scintigram done eight days later with 99mTc-DPD was normal. The possible reasons for this discrepancy are discussed.
BACKGROUND: Glucose tolerance is often impaired in Cystic Fibrosis. The impact of this condition on enteral nutritional support in case of malnourishment remains to be studied. METHOD: In this study the glucose-, C-peptide- and insulin-responses to an OGTT and a standard enteral formula load were investigated in 19 non-diabetic CF-patients. Each test was performed with a carbohydrate load of 1.75 g/kg bodyweight. RESULTS: 11 patients had a normal OGTT (Group I) and 8 had an impaired glucose tolerance (Group II). After the formula load the glucose concentrations were significantly lower than after the OGTT at 30, 60, and 90 min in both groups and at 120 min in group II only. In group II the glucose values exceeded 6.7 mmol/l at 120 min after both OGTT and formula load and were significantly higher than in group I. The food glycaemic index, a parameter for comparison of glucose response to different diets was calculated. It ranged from 30 to 80% in both groups. An increased C-peptide- and insulin-secretion was found in patients with impaired glucose tolerance. CONCLUSIONS: The condition of impaired glucose tolerance must be considered for enteral hyperalimentation of Cystic Fibrosis-patients. The selection of formulas for nutritional support should be based on the calculation of the Food Glycemic Index because of its high interindividual variability.
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Part 1 of the study measured the end-systolic and end-diastolic left atrial (LA) areas and volumes in 30 children through sector echocardiography, and compared these values with those obtained with biplane angiocardiography. A strong correlation exists between the LA area in the frontal plane as determined by apical (r greater than 0.91) and subcostal (r greater than 0.98) echocardiography on the one hand and by angiocardiography on the other. However, there is a slight underestimation of the LA area by the apical 4-chamber view. LA volume as determined by subcostal sector echocardiography in the frontal and sagittal plane also correlated well with LA volume calculated with biplane angiocardiography (r greater than 0.97). Part 2 of the study determined LA areas and volumes in 74 healthy newborns and infants by echocardiography and related them to body weight and body surface area, thus obtaining normal values for this age group. The relation of the LA area and volume measurements in newborns and infants to body weight or surface area was best described by a linear function. The mean of the percentage of systolic-diastolic area diminution was 53 +/- 6% for the apical 4-chamber view and 50 +/- 4% for the subcostal 4-chamber view. LA ejection fraction determined by the subcostal biplane volume measurements was 62 +/- 7% (mean +/- standard deviation). These values were independent of body weight or surface area.
DYRK1A is the first member of a novel subfamily of protein kinases with dual specificity. The human gene for DYRK1A is located in the "Down syndrome critical region" (21q22.2). Due to its relationship to the Drosophila gene minibrain (Mnb), whose mutation results in specific defects in neurogenesis, and based on functional experiments on transgenic mice, DYRK1A is discussed as a candidate gene for mental retardation in Down syndrome. The kinase is characterized by its ability to catalyze tyrosine-directed autophosphorylation as well as phosphorylation of serine/threonine residues in substrates. Its exact cellular function is yet unknown. DYRK1A is, however, known to be translocated into the nucleus and supposed to be involved in the control of cell growth and development. The pathogenetic impact of DYRK1A on Down syndrome needs further elucidation.
UNLABELLED: In the prophylaxis of stress ulcers with antacids in young infants there are no recommendations of dosages that consider the physiologic maturation of gastric acid secretion. During the first six month of life the amount of gastric acid secretion in relation to body weight and body surface area increases exponentially. Therefore adult dosages of antacids cannot be transferred to infants. METHODS: In a cross over study 12 infants aged between 4 and 174 days, who had been undergoing a cardiosurgical intervention with the heart lung machine, were treated during 48 hours with 2 different antacid regimens over a period of 24 hours each, monitoring the gastric pH continuously. The used antacid consisted of an aluminium-magnesium complex (Al(OH)3, 90 mg/ml and Mg(OH)2, 60 mg/ml): Regimen A: 6 x 0.5 ml per kg body weight. Regimen B: 0.25 ml per kg body weight at a gastric pH less than 3, with the pH read every 30 minutes. RESULTS: Compared to 28 applications under regimen B, 72 single doses were given under regimen A, 58 of them at a gastric pH of higher than 3. Thus, the mean administered dose was significant lower under regimen B (2.2 ml) than under regimen A (12.0 ml). Consequently, the mean level of gastric pH was higher under regimen A (median: 5.96 +/- 1.31 versus 4.94 +/- 1.16). pH-values lower than 3 were more often measured under regimen B, whereas the phases at this pH-level were longer under regimen A. CONCLUSION: The usual body weight related dosage of antacids seems to be to high for early infancy. In the face of the discrepancy of the administered antacid quantity comparing regimen A with regimen B, it seems to be reasonable for the studied age group to reduce the single antacid dose to 0.25 ml/kg body weight while adhering to a high application frequency of 6 times a day.