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  • 1
    ISSN: 1432-1912
    Keywords: Cardiac automaticity ; Adenosine receptors ; α-adrenoceptors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effects of the non-selective A2 adenosine receptor agonist 5′-N-ethyl-carboxamidoadenosine (NECA) were studied on ventricular automaticity induced by a local injury in the isolated right ventricle of the rat. In concentrations ranging from 0.1 to 100 nM, NECA significantly increased ventricular automaticity. This effect was not apparent when the nonselective α-adrenoceptor blocker phenoxybenzamine was present at a concentration of 10 μM, which antagonizes both α1-and α2-adrenoceptors, as well as when rats were pretreated with reserpine. In non-reserpinized rats, the excitatory effect of NECA was also abolished in the presence of the selective α1-adrenoceptor antagonist prazosin, but not in the presence of the α2-adrenoceptor antagonist idazoxan. In reserpinized rats, the excitatory effect of NECA was restored in the presence of the non specific α-adrenoceptor agonist phenylephrine as well as in the presence of the selective α1-adrenoceptor agonist amidephrine but not in the presence of the selective α2-adrenoceptor agonist clonidine. These results suggest that the excitatory effect of NECA on ectopic ventricular automaticity is dependent on endogenous catecholamines and that α-adrenoceptors of type 1 are, in some way, involved in this effect.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Child's nervous system 11 (1995), S. 112-114 
    ISSN: 1433-0350
    Keywords: Menkes' disease ; Copper deficiency ; Pili torti ; Magnetic resonance imaging ; Skeletal roentgenography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Menkes' disease, a neurodegenerative progressive X-linked disorder, was diagnosed in a 4-month-old child. The diagnosis was made on the combination of clinical features with laboratory and radiological findings. The pathogenesis of the skeletal findings in Menkes' disease is as yet unclear. Because of the severity of the prognosis and in order to plan treatment, the correct diagnosis has to be reached quickly. Typical manifestations of the syndrome are likely to develop after 3 months of age, with a pleiotropic appearance. In the present case, on the basis of the clinical investigation the patient underwent retrograde cystourethrography, roentgenographic examination of the skeleton, and magnetic resonance imaging of the brain. On analysis of the magnetic resonance imaging, we detected one-sided involvement of both subcortical and cortical parenchyma resembling a unilateral ischemic lesion such as, to our knowledge, has not yet been reported.
    Type of Medium: Electronic Resource
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