Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Congenital heart disease  (2)
  • Acute myeloid leukemia  (1)
  • 1
    ISSN: 1432-1440
    Keywords: Β-Adrenoceptors ; Mononuclear leukocytes ; Right atrium ; Down-regulation ; Catecholamines ; Congenital heart disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Sympathetic regulation of myocardial performance has been shown to be altered in congestive heart failure. Right atrial tissue of children with severe acyanotic and cyanotic congenital heart disease (CHD) showed a significantly lowerΒ-receptor density than that of children with less severe defects. Since mononuclear leukocytes (MNL) contain a homogeneous population ofΒ 2-adrenoceptors which have similar properties to those of cardiacΒ 2-adrenoceptors, they are frequently used for studying theΒ-adrenergic system. In a group of 37 children with CHD of different types and severity who underwent cardiac surgery, we compared the MNLΒ-adrenoceptor density to the type and severity of CHD and looked for a possible relationship to plasma catecholamine levels and to the right atrialΒ-adrenoceptor density. Membranes of MNL and myocardial cells were radiolabeled with (−)3-[125I]Iodocyanopindolol ([125I]ICYP). A significantly higherΒ-adrenoceptor density on MNL was found in patients with moderate acyanotic CHD (group I) than in those with severe acyanotic (group II) and cyanotic CHD (group III). Patients of group I showed approximatively 50% higher myocardialΒ-receptor density than those of groups II and III. ICI 118.551-[125I]ICYP competition studies revealed that in groups II and III significantly lower proportions and densities ofΒ 1-receptors were found compared to group I. Noradrenaline (NA) plasma levels in group II and group III were significantly higher than those in group I. The adrenaline plasma levels were found to be very high in all children with CHD. A significant negative correlation between NA levels and myocardial total andΒ 1-adrenoceptor density, but no correlation between plasma catecholamines and MNLΒ-adrenoceptor density, was calculated. We conclude that modulation of MNLΒ-adrenoceptors is not simply controlled by circulating catecholamine levels. CardiacΒ 2-adrenoceptor density remained unaltered, but theΒ 1-density was significantly lowered.Β 2-adrenoceptors on MNL showed a slight but significant decrease. However, cardiacΒ 2-adrenoceptor density cannot be predicted by measuring theΒ-adrenoceptor density on MNL.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatsschrift Kinderheilkunde 147 (1999), S. 346-350 
    ISSN: 1433-0474
    Keywords: Schlüsselwörter Myelosarkom ; Akute myeloische Leukämie (AML) ; Leucaemia cutis ; Hautinfiltration ; Key words Myelosarcoma ; Acute myeloid leukemia ; Aleukemic leukemia cutis ; Skin infiltration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Background: Isolated myelosarcoma of the skin in childhood is a rare manifestation of acute myeloid leukemia (AML) preceding bone marrow involvement by weeks to month. Results: During the studies of AML-BFM 87/93 for the treatment of acute myeloid leukemia an isolated myelosarcoma of the skin was diagnosed in eight patients aged 0.3 to 16 years. Histologically most cases were classified as monoblastic or myelomonocytic leukemia (FAB M5, n=5; FAB M4, n=4; FAB M0, n=1). Two infants, 3 and 6 month old remained in complete remission after being treated only by surgical or by oral cytostatic therapy. Two children treated according to the AML-BFM-schedule are in complete remission. Delayed performance of diagnostic procedures and the initially mild symptoms seemed to be the reasons for reduced treatment in the remaining cases. After first relapse all patients received intensive cytostatic treatment (AML-BFM 87/93), but all of them relapsed a second time. Three of these children died due to progressive disease after 21/2 to 31/2 years. Only one patient is in complete remission since 61/2 years. Conclusion: Suspect skin lesions should be considered as myelosarcoma preceding AML. Reduced treatment seems to be justified only for young toddlers without malignant bone marrow blasts. An early and intensive cytostatic treatment is recommended for all other children with isolated myelosarcoma of the skin.
    Notes: Zusammenfassung Hintergrund: Das isolierte Myelosarkom der Haut im Kindesalter ist eine seltene Manifestation der akuten myeloischen Leukämie (AML), die dem Nachweis der Leukämie im Knochenmark Wochen bis Monate vorausgehen kann. Studiendesign und Ergebnisse: In den AML-BFM 87/93-Studien zur Behandlung der akuten myeloischen Leukämie im Kindesalter wurden bei 8 Patienten (1,2%) im Alter von 3 Monaten bis 161/2 Jahren isolierte Myelosarkome der Haut diagnostiziert. Histologisch überwogen monoblastäre und myelomonozytäre Leukämiezellen (FAB M5, n=5; FAB M4, n=2; FAB M0, n=1). Während 2 Säuglinge, bei der Diagnose 3 und 6 Monate alt, nach lediglich lokaler chirurgischer Tumorexstirpation bzw. einer alleinigen oralen zytostatischen Therapie in anhaltender Vollremission verblieben, war dies bei den älteren Kindern (31/2–161/2 Jahre) nur bei den beiden gemäß AML-BFM-Studienprotokoll behandelten Patienten der Fall. Die verzögerte Diagnostik und die milde initiale Symptomatik führten bei den übrigen 4 Patienten zu einer reduzierten Initialbehandlung. Erst nach dem ersten Rezidiv erfolgte die intensive systemische Therapie (AML-BFM 87/93). Alle 4 Patienten erlitten ein 2. Rezidiv. 3 der Patienten verstarben 21/2–31/2 Jahre nach der Diagnose, 1 Patient befindet sich bei einer Beobachtungszeit von 61/2 Jahren in Vollremission. Schlußfolgerung: Bei außergewöhnlichen Hautinfiltrationen sollte das seltene Myelosarkom in die differentialdiagnostische Überlegungen einbezogen werden. Nur bei jungen Säuglingen mit solitärem Tumor ohne Knochenmarkbefall scheint eine abwartende Haltung gerechtfertigt zu sein. Für alle anderen Kinder wird eine frühzeitige intensive zytostatische Therapie empfohlen.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1432-1076
    Keywords: β-adrenoceptors ; Down-regulation ; Catecholamines ; Congenital heart disease
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Twenty-six infants and children with congenital heart disease (CHD) undergoing cardiac surgery were investigated for alterations in myocardial β-adrenoceptor density. The patients were divided into three groups according to type and severity of CHD: group I consisted of 6 patients with acyanotic shunt lesions of moderate severity; group II comprised 13 children with severe acyanotic shunt and valve lesions and group III included 7 children with cyanotic CHD. The myocardial β-adrenoceptor density was determined using (−)3-[125I] Iodocyanopindolol ([125I]ICYP) and was reduced by approximately 50% in severe acyanotic CHD (33.6 fmol/mg protein) and cyanotic CHD (35.3 fmol/mg protein) in comparison with the group with less severe acyanotic shunt defects (64.4 fmol/mg protein). The affinity dissociation constant (K d, ICYP) did not differ statistically between the groups. The proportion of β1- and β1-subpopulation was evaluated by ICI 118,551-[125I]ICYP competition studies. In group II (61.5%) and group III (69.1%) significant lower portions of β1-adrenoceptors were found compared with group I (78.2%). This shift of subpopulations was due to a decreased β1-receptor density while β2-receptor density was unchanged in all groups. While the plasma noradrenaline levels of group I were similar to those of a control group of 13 healthy children, respective values of group II and III were significantly elevated. A significant negative correlation was found between plasma noradrenaline levels and myocardial β-adrenoceptor density. It is concluded that exposure of these receptors to increased circulating catecholamines, due to an enhanced sympathetic tone, leads to a reduction of their density. Noradrenaline, a preferential agonist of β1-adrenoceptors, is most probably responsible for the shift of the β-adrenoceptor subpopulations from the β1- to β2-subtype, depending on severity and type of cardiac disease.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...