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Biomedical subjects

L David

Publications and source records attributed to L David.

At least 163 records · Page 9Linked to original sources
PubMed1987

[Scriver type autosomal hypophosphatemic rachitis: a family case].

A familial observation of hypophosphatemic rickets with unusual inheritance and evolution, different from that of X linked hypophosphatemia, is reported. The mode of inheritance was autosomal dominant, a father and his son being affected. Severe early signs of rickets and delayed growth were present in both cases. Plasma 1,25 dihydroxyvitamin D and PTH levels were normal. There was no hypercalciuria. Complete cure of rickets and catch-up growth were obtained with the only treatment of vitamin D (40,000 U/day) in the father and of 1 alpha hydroxyvitamin D (1 microgram/day) in the son. This observation is quite similar to the 'autosomal hypophosphatemic bone disease' described by Scriver et al. It illustrates the heterogeneity of familial hypophosphatemia which presently includes 4 different physiopathological entities.

Genes, Dominant↗
PubMed1987

[A migrating ear of barley: a curious story of an intrabronchial foreign body].

A case of migrating inhaled ear of barley in a 2 1/2 year old boy is reported with: 1) mild initial symptoms at the time of inhalation followed by a symptomless interval of 8 days; 2) at day 9 fever and dyspnea, right paracardiac infiltrate with pleural reaction on X-rays, normal bronchoscopy; 3) at day 11 extensive right pneumothorax; 4) at day 20, right axillary inflammatory lesion; 5) at day 28 expulsion of an ear of barley from this lesion, followed by complete recovery.

Axilla↗
PubMed1987

[The role of immunosuppressive agents in the treatment of nephrosis in children].

Good clinical results are well known with the use of immunosuppressive therapy in children with idiopathic nephrotic syndrome; more recently, biological data have enhanced immunological anomalies, concerning mainly T helper lymphocytes. The need for steroids may decrease when relapsing nephrotic syndrome is associated with steroid intoxication and is absent when corticoresistance occurs. In these cases, the use of immunosuppressive agents is justified, but limited by side effects and toxicity. In patients treated with alkylating agents and now cyclosporine, good responses are often seen in frequently relapsing children whereas the course of steroid-resistant nephrotic syndrome is not significantly modified. However, the definite appreciation of such therapeutic results has to be further precised by both histological data and multicentric studies concerning new protocols.

Adrenal Cortex Hormones↗
PubMed1987

[Value of blood creatinine in children].

Non-standardized values of serum creatinine are studied in 205 children aged 3 months to 12 years. Data are collected from paediatric patients hospitalised for mild illness without previous renal impairment; these values are quite comparable to those related in the literature based or standardised methods. The normal age-dependent serum creatinine values (mean +/- 2 SD) are shown in a graphic curve, which confirms that serum creatinine increases with age and that it is a faithful parameter to estimate the glomerular filtration rate in children.

Aging↗
PubMed1987

[Severe, refractory neonatal inflammatory syndrome as the manifestation of a systemic multivisceral and meningeal syndrome].

A neonate presented with an inflammatory syndrome with multisystemic manifestations. There was no remission until age 6 years, despite anti-inflammatory treatments. Neonatal onset and neuromeningeal manifestations identified a peculiar rare inflammatory syndrome, whose relationship with juvenile rheumatoid arthritis is discussed. In the case reported, renal, abdominal, deep lymphatic and cranial involvements were present: these have not been previously reported.

Follow-Up Studies↗
PubMed1987

[Statural growth of Moghrabin children living in France].

In order to compare the statural growth of French and Maghrebian children living in France, the authors measured the height of 1,243 children aged between one month and 16 years. The study showed no significant difference at any age between the two ethnic groups. It is therefore possible, in daily medical practice, to use the same age charts for French and maghrebian children living in France.

Adolescent↗
PubMed1986

[Genitography of sexual ambiguities in children].

In children with pseudo or true hermaphroditisms genitography is easy to perform and reliable. This examination helps in determining the morphological sex and becomes necessary if surgery of the genital tract is considered.

Child, Preschool↗
PubMed1986

[Neonatal testicular torsion].

Twenty-six cases of neonatal torsion of spermatic cord were studied and compared to 171 cases reported in the literature. In a few cases, the torsion was antenatal and this may explain some absent testes. Diagnosis is sometimes difficult to make; symptoms were comparable to those in other disorders: peritoneo-vaginal tunnel, testicular inflammation or testicular tumor. In these cases, surgery can make the exact diagnosis although it cannot save the testis even if it is performed early.

Atrophy↗
PubMed1985

Immunocytochemical evidence for endogenous calcitonin and parathyroid hormone in osteoblasts from the calvaria of neonatal mice. Absence of endogenous estradiol and estradiol receptors.

Immunoreactivities to endogenous calcitonin, endogenous parathyroid hormone, endogenous estradiol and estradiol receptors were studied in osteoblasts from the calvaria of neonatal mice by immunocytochemistry with the use of ultrathin sections obtained by cryo-ultramicrotomy. Tissues were fixed in glutaraldehyde, postfixed in osmium tetroxide and frozen in liquid nitrogen. Estradiol and estradiol receptors could not be detected in osteoblasts, whereas calcitonin- and parathyroid hormone-like immunoreactivities were observed in this cell type. Calcitonin and parathyroid hormone had similar subcellular localizations: immunoreactivities were observed at the plasma-membrane level, in the cytoplasmic matrix, and in the nucleus. These results provide immunocytological evidence for: 1) the internalization of calcitonin and parathyroid hormone in osteoblasts; 2) a direct participation of calcitonin and parathyroid hormone in the regulation of osteoblasts; 3) the absence of estradiol receptors and estradiol in osteoblasts.

Animals↗
PubMed1985

Effect of phosphate supplementation to breast fed very low birthweight infants on urinary calcium excretion, serum immunoreactive parathyroid hormone and plasma 1,25-dihydroxy-vitamin D concentration.

The effect of two doses of Phosphorus (P) supplementation to pooled breast milk (BM): 0.48 and 0.800 mmol/kg/24 h given during the second month of life was evaluated in 22 very low birthweight infants. The concentration of calcium and phosphorus in serum and urine, the serum concentration of immunoreactive parathyroid hormone (iPTH) and the plasma 1,25-dihydroxy-vitamin D concentration (1,25-OH-D) were compared to the values in 19 control infants. The mean +/- SD concentrations in control infants and adults are 63 +/- 18 microliters Eq/ml for serum iPTH and 85 +/- pmol/l for plasma 1,25-OH-D. With 0.48 P supplementation, urinary Ca (UCa) excretion (median and range) 0.238 mmol/kg/24 h (0.105-0.520) was lower than in the control group 0.288 (0.205-0.679) (p less than 0.05); the reduction of UCa was larger with 0.8 P supplementation: 0.047 (0.023-0.163) (p less than 0.01). P supplementation induced no change in serum Ca concentration but a slight and significant increase in serum iPTH was observed only with the 0.8 P supplementation: 55 microliters Eq/ml (less than 25-80) (p less than 0.05). With 0.8 P supplementation there was no significant change of plasma 1,25-OH-D concentration: 173 pmol/l (106-271) vs. 255 (132-293) in the control group. These data show that with 0.8 P supplementation, the hypercalciuria in BM-fed infant disappears without secondary hyperparathyroidism, but without any change in plasma 1,25-OH-D concentration.

Breast Feeding↗
PubMed1985

Abierixin, a new polyether antibiotic. Production, structural determination and biological activities.

A new polyether antibiotic, abierixin, was found in the mycelium of a culture broth of nigericin-producing Streptomyces albus NRRL B-1865. Abierixin was extracted with organic solvents and purified by column chromatography and HPLC. The structure of abierixin was determined by FAB/MS/MS and CI/MS/MS and 1H and 13C NMR spectrometries. Abierixin exhibited weak antimicrobial and ionophorous activities, low toxicity but good anticoccidial activity. Nigericin biosynthesis from abierixin is discussed.

Animals↗
PubMed1985

[Postmeningococcal pericarditis in children. A case favoring an immunoallergic process].

A case of pericarditis following meningococcal meningitis in a 19 month old boy is presented. First clinical signs were noted after 5 days of antibiotherapy (Cefotaxime); at that time the meningitis was cured and the bacteriologic studies yielded negative results. Complete clinical recovery was obtained within 24 hours of treatment with prednisone (2 mg/kg), antibiotherapy being stopped 4 days earlier. The pathogenesis of post meningococcal pericarditis is discussed based on the data from the literature. This observation adds support to an immuno-allergic origin of this pericarditis.

Humans↗
PubMed1985

Neonatal hypercalcemia in preterm infants fed with human milk.

Hypercalcemia (serum Ca greater than or equal to 2.83 mmol/l) was detected in 10 premature infants (gestational age: 31-37 weeks and birthweight: 1100-1950 g). All were fed with pooled human breast milk. Urinary Ca excretion was high (greater than 0.200 mmol/kg/24 h) in all but one infant while serum phosphorus (P) concentration and urinary P excretion were low. Serum immunoreactive parathyroid hormone and plasma 25-hydroxyvitamin-D concentrations were normal. A significant positive correlation was found between serum Ca concentration and urinary Ca excretion, and a negative correlation between serum Ca concentration and serum P concentration or urinary P excretion. Hypercalcemia disappeared spontaneously in two patients, was corrected by a humanized milk in three patients and by P supplementation in five patients. These data suggest that neonatal hypercalcemia is related to P depletion induced by human breast milk in premature infants.

Calcifediol↗
PubMed1985

[A familial case of Rothmund-Thomson syndrome. A case in favor of the uniqueness of the syndrome. Association with osteosarcoma].

A 7 years old girl with Rothmund-Thomson syndrome is described. A detailed study of the dermatologic lesions has been performed. The parent's girl are first cousins and one of her brothers, also having the Rothmund-Thomson syndrome, died from an osteosarcoma of the tibia at the age of 11. This familial observation gives support to the uniqueness of the Rothmund-Thomson syndrome with autosomal recessive inheritance.

Abnormalities, Multiple↗