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Biomedical subjects

V Moretti

Publications and source records attributed to V Moretti.

34 records · Page 2Linked to original sources
PubMed1986

Intracaval and intracardiac leiomyomatosis of uterine origin.

Intracaval leiomyomatosis of uterine origin is a rare disease. Extension to the right heart is exceptional. Based on the review of 11 cases reported in the literature and the case presented herein, which was treated successfully, the diagnostic and therapeutic problems are discussed. Diagnosis should be suggested when a female patient operated on previously for myofibroma of the uterus by hysterectomy, presents with a picture of cardiac myxoma. Diagnosis can be confirmed by iliocavogram and computerized tomography of the abdomen. Excision calls for a cardiac procedure under extracorporeal circulation and caval exploration which may be performed either simultaneously or as a two stage procedure.

Adult↗
PubMedDate not supplied

An experimental study on dependence liability of zipeprol.

Zipeprol, a piperazine ethanol derivative, is a non-essential but widely used (paediatric) antitussive, which is not legally considered as being capable of creating dependence or abuse liability. A first group of experimental results was obtained assaying the displacement of 1 nM [3H]naloxone by zipeprol vs morphine on the rat brain homogenate fractions. A second group was carried out on the longitudinal muscle of guinea-pig ileum, using the field stimulation technique, either in the absence or in the presence of naloxone 1 x 10(-5)M or in the absence or in the presence of yohimbine 1 x 10(-5)M. Further investigations concerning the pharmacological and the biochemical characterization of the mechanisms involved in abuse liability were carried out by means of the in vitro inhibition of ACh response on the guinea-pig ileum preparation. The results indicate zipeprol as a moderate opioid agonist, which also shows a direct anticholinergic effect, independent of presynaptic alpha 2 interaction.

Acetylcholine↗
PubMedDate not supplied

Some approaches to the pharmacology of multisubstrate enzyme systems.

Analytical and exploratory in vitro, in situ and in vivo, physio-pharmacotoxicology, from enzymology to population epidemiology, now embraces those approaches that correlate complex dynamic multisubstrate kinetics through conventional and more recent non-invasive quantitative methodologies. Basically, substrates may be classed as pertaining to fundamental energy turnovers (first-order cellular metabolic pathways or networks) and to iso- vs allosteric modulator systems (second-order metabolic control network). Pairs of substrates and cofactors set-up the third-order multienzyme-receptor patterns, which in intact, native in vivo structures establish and maintain the compartmentalized, dynamically superimposed overall coordination of local redox and phosphate potentials. Perturbations of the various levels of the metabolic hierarchy induced by drugs, as well their relaxations, can be readily submitted to non-invasive kinetic analysis. Both indirect and direct titrations of substrate levels, their modelling and statistical ad hoc evaluations of their interrelations can lead to the identification of the multiple sites involved in drug effects as structured at the different orders/levels of concomitant functional variations. Fractal geometries contribute towards defining the space- and time-related events.

Animals↗
PubMedDate not supplied

[Clinical and instrumental diagnosis of Alzheimer's and multi-infarct dementia].

We investigated the possible correlation between functional and anatomical imaging techniques and clinical exams in patients with Alzheimer's and vascular dementia. We examined 24 patients affected with dementia, 16 of them with Alzheimer's disease. 7 with multiinfarct and 1 with mixed dementia. All patients were submitted to clinical, morphological (MRI, CT) and functional (SPECT, cerebral flowmetry) studies. The severity of hypoperfusion revealed by SPECT was highly correlated with cognitive impairment in Alzheimer's dementia patients. The abnormal perfusion was mostly bilateral, in the temporal-parietal region, and involved the frontal regions only in the most severe cases. CT and especially MRI showed aspecific cortical and subcortical atrophy, most evident in the medial temporal region. In the patients with multiinfarct dementia, the hypoperfused cortical regions revealed by SPECT were sometimes related to vascular lesions proved at MRI and CT. In the patients with multiinfarct dementia, MRI showed more or less apparent white matter lesions referrable to ischemic insult, besides cortical and subcortical atrophy. MRI allows a differential diagnosis between these two cerebral pathologic conditions of aging. Cerebral flowmetry by Xenon 133 inhalation showed reduced cerebral blood flow in both dementia types. In Alzheimer patients, regional flow was reduced especially in the posterior parietal regions. In multiinfarct dementia patients, flow was more diffusely reduced and asymmetrical. Brain function imaging appears to yield useful information for the differential diagnosis in the most common dementia syndromes. Since the neuropathologic data from brain biopsy are rarely available, clinical and instrumental findings must be integrated for diagnostic and pathogenetic insights of the diseases causing cognitive impairment.

Alzheimer Disease↗