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Biomedical subjects

M Nathanson

Publications and source records attributed to M Nathanson.

At least 37 records · Page 2Linked to original sources
PubMed1994

[Homozygote CB deficiency revealed by recurrent Neisseria meningitidis infections in an adolescent].

BACKGROUND: Meningococcal infections associated with late complement component deficiency are rarely severe and usually occur during adolescence and adulthood. We report severe manifestations in a boy in whom the first episode appeared early. CASE REPORT: A 14 year-old gypsy boy was admitted because of a febrile meningococcal meningitis that was complicated by a rapidly extensive and necrotic purpura, obnubilation and clotting abnormalities without hemodynamic anomalies. The patient was given symptomatic therapy and a 12-day course of antibiotics that resulted in rapid and complete recovery. Medical history of this patient showed that he had been admitted at the age of 3 years for a severe febrile purpura with septic shock and clotting abnormalities followed by rapid and complete recovery after symptomatic and antibiotic therapy. No germ had been then isolated. The complement system was studied 3 weeks after the second hospitalization: total hemolytic complement activity could not be detected and C2, C3 and C4 were normal. Examination of the terminal pathway-revealed total C8 deficiency. The patient received meningococcal vaccine and was discharged on oral penicillin prophylaxis. He remained healthy during the ensuing 4 years. CONCLUSIONS: Meningococcal infections associated with late complement component deficiency are generally uncomplicated but they remain potentially severe. Early screening for this late complement component deficiency should be considered after severe clinical manifestations.

Adolescent↗
PubMed1994

[Hyperglycemia revealing neonatal infection].

BACKGROUND: Hyperglycemia as the first manifestation of neonatal sepsis is rare. CASE REPORT: A breast-fed neonate was admitted at the age of 6 days because of vomiting. Group B streptococci had been isolated in secretions of the ear at birth but the neonate had not been treated. At admission, physical examination was normal but glucosuria, without ketonuria, and hyperglycemia (9.7 mmol/l) were noted. Because hyperglycemia was not explained by usual causes, the baby was systemically given antibiotics. The next day, blood, spinal fluid and urine cultures taken on admission were positive for group B streptococci while blood fibrinogen and C-reactive protein were increased. Hyperglycemia and glycosuria were normal after 24 hours of antibiotic therapy and follow-up was uneventful. Subsequently, the same bacteria was isolated from the mother's milk. CONCLUSION: Isolated hyperglycemia may reveal an infection; therefore its discovery might contribute to early diagnosis and treatment.

Breast Feeding↗
PubMed1994

Behavior, family function, school performance, and predictors of persistent disturbance in sexually abused children.

OBJECTIVE: Although sexual abuse is widely considered to have severe sequelae, most studies of children's status after sexual abuse have had major limitations, including retrospective design, small sample sizes, selective enrollment of subjects, no comparison groups, and lack of information about potentially confounding characteristics of studied children. The aim of this study was to clarify the impact of sexual abuse on children's psychological well-being. METHODS: We prospectively studied 154 children who were brought to urban, university-affiliated hospitals for assessment of recently disclosed sexual abuse and compared them with a control group of 53 demographically similar children not known to have been sexually abused. RESULTS: In comparison with the control children, fewer of the sexually abused children had health insurance and more had received psychiatric care unrelated to the sexual abuse. Most initial ratings of behavior, maternal psychiatric status, family function, and school performance were less favorable among the sexually abused than among the control children (P < .05). At follow-up 6 months later, the psychiatric status of the mothers of the abused children apparently improved, but the children's difficulties largely persisted. Baseline characteristics of the abused children significantly or suggestively associated with persisting problematic behavior were older age (P = .04), lower maternal educational attainment (P = .06), poorer maternal psychiatric status (P = .04) and lower family integration (P < .001). These four factors accounted for 31% of the variance in the children's behavior at 6-month follow-up (P < .001). Unexpectedly, characteristics of the children's sexual abuse experiences did not predict their later behavioral status. CONCLUSIONS: These findings suggest that preexisting, long-standing adverse psychosocial circumstances may contribute importantly to persistently problematic behavior and school performance among sexually abused children. The findings also suggest that it is children's preexisting psychosocial circumstances, rather than the abuse, that determine, at least in part, the nature of their functional outcomes.

Achievement↗
PubMed1992

Immunocytochemical expression and localization of protein kinase C in bovine aortic endothelial cells.

Total PKC activity in BAEC incubated for 24 hrs in either 10% serum (FBS) or serum-deprived media (SDM) was similar. However, most of the activity (69%) in the FBS group was detected in the particulate fraction, while it was mainly in the cytosolic fraction (66%) in the SDM group. By confocal microscopy, there was diffuse cytoplasmic localization of the antibodies to the alpha and beta PKC isoforms. gamma PKC was not detected. Treatment of FBS or SDM cells with a phorbol ester resulted in an increase in PKC activity with translocation to the particulate fraction. PKC alpha immunofluorescence redistributed to the perinuclear region whereas PKC beta staining remained mostly cytosolic. Calphostin C, a PKC inhibitor, prevented the phorbol ester-induced increase in PKC activity and translocation.

Animals↗
PubMed1992

Francis X. Dercum.

Explore the source record for details and available documents.

History, 20th Century↗
PubMed1992

Miliary tuberculosis with acute respiratory failure and histiocytic hemophagocytosis. Successful treatment with extracorporeal lung support and epipodophyllotoxin VP 16-213.

A 14-year-old girl with high fever, dyspnea and bilateral miliary nodules on chest X-ray, developed a rapidly progressive respiratory failure associated with histiocytic hemophagocytosis. Histologic examination of bone marrow biopsy revealed tuberculous granulomas with caseating necrosis. We report a pediatric case in which treatment with extracorporeal lung support and epipodophyllotoxin VP 16-213 was successful.

Adolescent↗
PubMed1992

[Acute heart insufficiency in an 8-month-old infant presenting with hypocalcemia and Epstein-Barr virus infection: acute myocarditis? Or primary hypokinetic dilated cardiomyopathy?].

An eight-month-old was admitted for acute congestive heart failure with fever. The respective parts played by hypocalcemia (due to vitamin-D deficiency rickets) and acute Epstein-Barr virus infection are discussed. Hypocalcemia was sufficiently marked to induce heart failure per se but replenishment of calcium stores was followed by only partial improvement in cardiac manifestations. Initial management was difficult because of the risks associated with concomitant administration of calcium and digitalis. After eighteen months during which the patient's status remained stable, evaluation showed that clinical features were consistent with sequelae of acute viral myocarditis. The possibility of primary hypokinetic dilated cardiomyopathy was then considered. Esterified carnitine levels were found to be increased leading to further investigations which outruled mitochondrial cytopathy.

Acute Disease↗
PubMed1992

Juvenile chronic myelocytic leukemia with unusual cytogenetic clonal evolution.

Cytogenetic studies are reported in a case of juvenile chronic myelocytic leukemia with dysmyelopoiesis and skin involvement. The clonal evolution of a 6q-anomaly is described. Hematological and cytogenetic findings suggest a role of hematopoietic stem cell in this patient for whom the outcome was fatal.

Child, Preschool↗
PubMed1989

A double-blind, controlled study of high-dose L-deprenyl in the treatment of Parkinson's disease.

The conventional dose of deprenyl used in Parkinson's disease is 10 mg/day, having been established by in vitro platelet studies and clinical evaluation. Twelve patients with Parkinson's disease on treatment with L-dopa who showed evidence of wearing-off effects or motor oscillation were studied in a double-blind, placebo-controlled, crossover trial to compare conventional doses of deprenyl with higher doses (up to 40 mg/day) and placebo. We did not find higher doses of deprenyl to be superior to conventional doses and in 17% of cases treatment had to be withdrawn because of side effects.

Adjuvants, Pharmaceutic↗
PubMed1989

Tissue acidosis: role in sustained arteriolar dilatation distal to a coronary stenosis.

This study tested the hypothesis that myocardial tissue acidosis is responsible for maintenance of reduced arteriolar tone distal to a severe coronary arterial stenosis. Domestic swine (n = 10) were instrumented with a coronary arterial stenosis that reduced vessel diameter 80%. Measurements of hemodynamic indexes were made 1) before stenosis, 2) at 5, 20, and 60 minutes after stenosis placement, and 3) after each of three, 20-minute NaOH infusions (0.05 M, 0.1 M, and 0.5 M) distal to the stenosis (group 1). Intracellular pH at the end of 30 minutes of 0.5 M NaOH infusion distal to the stenosis was measured in a second group (n = 6) of swine (group 2). After stenosis placement in group 1, endocardial blood flow declined significantly, and evidence of regional acidosis (increased coronary venous Pco2 and decreased coronary venous pH) and ischemia (lactate production) developed. One hour later, evidence of acidosis persisted, though to a lesser extent. Myocardial oxygen and lactate metabolism exhibited similar patterns. Infusion of 0.5 M NaOH (0.38 ml/min) reduced (p less than 0.01) distal zone epicardial blood flow but did not change endocardial flow. Regional myocardial oxygen extraction (75 +/- 8%, mean +/- SD) and consumption (8.2 +/- 2.3 ml/min/100 g) also declined significantly (p less than 0.01) in response to 0.5 M NaOH infusion compared with 60 minutes after stenosis (86 +/- 4 and 12.4 +/- 2.8 ml/min/100 g respectively).(ABSTRACT TRUNCATED AT 250 WORDS)

Acidosis↗