Search PubMed⌕ Search

Biomedical subjects

N Clausen

Publications and source records attributed to N Clausen.

72 records · Page 4Linked to original sources
PubMed1985

Disseminated histiocytosis X. A clinical and immunohistochemical retrospective study.

Fourteen cases of disseminated histiocytosis x (HX) from a 15 year period were studied clinicopathologically. Morbidity and mortality were comparable to that of previous reports on disseminated HX. S-100 protein, recently established as a HX marker, was demonstrated immunohistochemically in the cytoplasm and the nuclei of the HX cells of 12 examined cases. Neuron specific enolase (NSE) positive material was found in a minority of the cells of 2 cases. Cytoplasmic lysozyme was present in the mononuclear cells accompanying the HX cells in all examined cases. These results show that immunohistochemical demonstration of S-100 protein and lysozyme can be successfully applied to formalin-fixed, paraffin embedded tissue after storage at room temperature for as long as 15 years. The presence of cytoplasmic NSE positivity in the lesions from 2 patients was surprising and has not previously been observed in HX. This finding suggests an antigenic heterogenicity between cases with the disease of unknown prognostic significance. Nor did the presence of lysozyme in the lesions from patients with acute as well as chronic disease yield any prognostic information.

Autopsy↗
PubMed1984

Prognostic factors for relapse-free survival in childhood acute lymphoblastic leukaemia.

11 variables determined at the onset of acute lymphocytic leukaemia were tested to predict disease-free survival in 267 children. All children had received similar induction treatment and basic maintenance therapy, whereas 5 different reinforcement treatments were administered irrespective of the severity of the disease at onset. Three modes of prophylactic central nervous system treatment were employed. The risk of relapse was significantly increased for leucocyte count above 50 X 10(9)/1, lymphoblasts above 80% in peripheral blood, age below 2 years or over 5 years, and for males. The risk of relapse was increased by estimated factors of 1.9, 2.3, 1.7, and 1.7, respectively. When the above 4 variables were included in the model, no further prognostic value was demonstrated for haemoglobin concentration, platelet count, signs of bleeding in the skin, mucous membranes or intracranially, presence of leukaemic infiltrations outside the bone marrow, hepatosplenomegaly, mediastinal mass, or T- or B-cell leukaemia. However, evaluation of T- or B-lymphoblast type impact was hampered by small numbers.

Age Factors↗
PubMed1984

Central nervous system relapse surveillance by serial beta 2-microglobulin measurements in childhood acute lymphoblastic leukemia.

Beta 2-microglobulin (beta 2m) is synthesized particularly in lymphocytes. Its value for early detection of central nervous system (CNS) involvement in acute lymphoblastic leukemia in children was tested by serial determinations. Before 9 overt CNS relapses, the mean increase of the cerebrospinal fluid (CSF) beta 2m concentration was 588 micrograms/l/month (range: -50 to +2020), which was significantly higher than the steady levels during maintenance treatment. Although the absolute value of CSF beta 2m was increased to 1 430 micrograms/l in the group with overt CNS relapse, individual variations in CSF beta 2m before a relapse were so great that no difference was seen between samples from CSF with or without lymphoblasts. The ratio between beta 2m in the CSF and in serum did not increase in serial samples prior to overt relapse, but the ratio was higher in patients with CNS relapse compared with a control group on maintenance therapy. In 9 children without CNS leukemia, the beta 2m concentration in CSF and serum decreased to a nadir 4 weeks after the start of induction treatment. The subsequent increase of CSF beta 2m was similar to the increase before a CNS relapse. Mean values of CSF beta 2m changes differed between groups of children with and without CNS leukemia early in the induction phase and during the maintenance treatment, but the wide range in individual values made serial beta 2m determinations unsuitable for detecting a CNS relapse.

Adolescent↗
PubMed1983

Skeletal scintigraphy and radiography at onset of acute lymphocytic leukemia in children.

99mTechnetium skeletal scintigraphy performed at the time of diagnosis was compared with pain and radiographs in 24 children with acute lymphocytic leukemia. Localized intense uptake of the labeled compound in one or several metaphyses and increased uptake in diaphyses were typical findings by scintigraphy. The skeleton of each child was subdivided into 18 regions, and investigated for the presence of pain and for possible radiographic and scintigraphic abnormalities. In a total of 432 regions (18 regions in each of 24 children), pain was present in 23 regions, radiographic anomalies in 54 regions, and abnormal technetium uptake in 98 regions. Signs and symptoms were most often found in the lower extremities. Pain and radiographic or scintigraphic abnormalities were not regularly found in the same skeletal regions. The individual number of radiographic abnormalities was negatively correlated with age, whereas the number of regions with abnormal technetium uptake was positively correlated with age. No significant correlation was found between the number of abnormal scintigraphic or radiographic regions and the clinical outcome of the disease.

Adolescent↗
PubMed1982

Late recurrence of Wilms tumor.

Three patients with Wilms tumors recurring after nine years in an organized abdominal hematoma, after ten years in the lung, and after eleven years in the central nervous system, respectively, are presented. It is proposed that the nephroblastoma cells have survived in a latent or a very slowly growing state. The reactivation mechanisms are briefly discussed. A review of the literature indicates a rate of recurrence of nonmetastasizing Wilms tumors later than 24 months of 1.4--3.9%.

Child, Preschool↗
PubMed1982

Cranial computed tomography during treatment of childhood lymphocytic leukemia. Factors predisposing to abnormalities.

Twenty-three children with acute lymphocytic leukemia (ALL) were examined by computed tomography (CT) of the head on two occasions more than 11 months apart. The first CT was performed at the time of diagnosis in 11 children, who were re-examined while still in their first complete remission. They had received prophylactic central nervous system (CNS) treatment consisting of intrathecal methotrexate supplemented by irradiation in 7 cases and intermediate dose methotrexate in 4 cases. Twelve children were receiving treatment for CNS relapse. This included therapeutic irradiation and intrathecal methotrexate. Abnormal CT developed in 7 children. Three CT scans demonstrated areas of decreased attenuation coefficient, one with intracerebral calcifications. In 5 patients, dilatation of the ventricles and cortical sulci had developed. All CT abnormalities occurred in children in remission after CNS relapse. These results indicate that prophylactic treatment including cranial irradiation with 24 Gy and low cumulative doses of methotrexate is a safe procedure. Patients with CNS leukemia are at risk of developing CNS abnormalities, when they receive treatment with cranial irradiation and methotrexate. The risk is not correlated with age or sex of the child, the duration of the disease, the dose of irradiation or the cumulative dose of methotrexate.

Adolescent↗
PubMed1981

The development of cerebral CT changes during treatment of acute lymphocytic leukemia in childhood.

Twenty-three children with acute lymphocytic leukemia (ALL) were examined with cranial CT at least twice with a minimal interval of 10 months. The first CT was performed at the time of diagnosis in 11 children and during therapy in 12; all but two were normal on the first CT examination. These two had slight enlargement of the ventricular system and subarachnoid space at the time of diagnosis. These findings were unchanged on the second CT examinations. Seven patients, all in remission from leukemia of the central nervous system manifested abnormal findings on later CTs. Low density areas in the periventricular white matter were seen in the brains of three, with increasing subcortical calcification in one of these cases. Five children had slight enlargement of the ventricular system and subarachnoid space, especially of the basal and Sylvian cisterns. Later CT examinations in five, plus brain autopsy in two cases, revealed unchanged or progressive conditions. The CT findings have been related to the treatment and some characteristics of the disease. The frequency of CT abnormalities was higher in patients who had received therapeutic irradiation and intraventricular methotrexate treatment. The possible reasons for the CT abnormalities are discussed.

Adolescent↗
PubMed1980

Age-dependent variations in serum 1,25-dihydroxyvitamin D in childhood.

Circulating 1,25-dihydroxyvitamin D (1,25-(OH)2D) was measured in 87 children aged 3 months to 15 years, and in 11 adolescents 16-19 years of age. A positive correlation to growth velocity was observed, indicating that the biologically active vitamin D metabolite is an important physiological factor in the regulation of growth and development of the skeleton.

Adolescent↗
PubMed1979

Antihypertensive effect of a non-selective (propranolol) and a cardioselective (metoprolol) beta-adrenoceptor blocking agent at rest and during exercise.

1 The antihypertensive effects at rest and during physical exercise of the non-selective beta-adrenoceptor blocker propranolol and the cardioselective beta-adrenoceptor blocker metoprolol were compared in a double-blind cross-over study. 2 Eighteen patients with mild hypertension entered the trial. One patient was withdrawn from the study due to side effects on both drugs. 3 The two beta-adrenoceptor blockers were compared using doses earlier shown to have the same beta-adrenoceptor blocking potency, as measured by their effect on exercise tachycardia in healthy men. 4 Arterial blood pressure was reduced to the same extent by propranolol and metoprolol at rest as well as during submaximal work. 5 It is concluded that the antihypertensive effect of beta-adrenoceptor blockers is mainly mediated through blockade of the beta 1-adrenoceptors.

Adult↗
PubMed1978

Out-patient gastroscopy risks.

Complications in out-patient gastroscopy were evaluated retrospectively in 995 examinations performed in 625 patients. At the examination seven complications were registered in the gastroscopy record. Two complications: perforation of the stomach and cardiac arrhythmia, required hospitalisation. None of the complications was lethal. Inquiries to the referring general practitioners revealed 5 cases where the gastroscopy had led to consultations because of minor complaints after the examination. Considering all complaints as complications the frequency of complications in out-patient gastroscopy was 1.2%.

Adolescent↗
PubMedDate not supplied

Origin of nondisjunction in trisomy 8 and trisomy 8 mosaicism.

Causes of chromosomal nondisjunction is one of the remaining unanswered questions in human genetics. In order to increase our understanding of the mechanisms underlying nondisjunction we have performed a molecular study on trisomy 8 and trisomy 8 mosaicism. We report the results on analyses of 26 probands (and parents) using 19 microsatellite DNA markers mapping along the length of chromosome 8. The 26 cases represented 20 live births, four spontaneous abortions, and two prenatal diagnoses (CVS). The results of the nondisjunction studies show that 20 cases (13 maternal, 7 paternal) were probably due to mitotic (postzygotic) duplication as reduction to homozygosity of all informative markers was observed and as no third allele was ever detected. Only two cases from spontaneous abortions were due to maternal meiotic nondisjunction. In four cases we were not able to detect the extra chromosome due to a low level of mosaicism. These results are in contrast to the common autosomal trisomies (including mosaics), where the majority of cases are due to errors in maternal meiosis.

Child↗