Search results for " Atri"
showing 10 items of 304 documents
IL PROCESSO INFIAMMATORIO E LA FIBRILLAZIONE ATRIALE: RELAZIONE FRA I LIVELLI EMATICI DI PCR, FIBRINOGENO C E MMP-9 E DIFFERENTI PATTERN CLINICI DELL…
2011
Chronic Apical and Nonapical Right Ventricular Pacing in Patients with High-Grade Atrioventricular Block: Results of the Right Pace Study
2018
Objective. The aim of the study was to compare the two approaches to chronic right ventricular pacing currently adopted in clinical practice: right ventricular apical (RVA) and non-RVA pacing. Background. Chronic RVA pacing is associated with an increased risk of atrial fibrillation, morbidity, and even mortality. Non-RVA pacing may yield more physiologic ventricular activation and provide potential long-term benefits and has recently been adopted as standard procedure at many implanting centers. Methods. The Right Pace study was a multicenter, prospective, single-blind, nonrandomized trial involving 437 patients indicated for dual-chamber pacemaker implantation with a high percentage of RV…
Collegio, Atri (facciata del collegio prospiciente sul giardino)
2017
Scheda su un disegno relativo al collegio di Atri: facciata del collegio prospiciente sul giardino, schematica rappresentazione dello stato di fatto. La scheda catalografica fa parte di un lavoro di revisione e aggiornamento del catalogo dei disegni di progetto delle sedi della Compagnia di Gesù, custoditi presso la Bibliothèque Nationale de France (BNF) e l'Archivum Romanum Societatis Iesu (ARSI), pubblicato da Vallery-Radot J. nel 1960.
A morphology-based approach to the evaluation of atrial fibrillation organization.
2007
What Is the Role of Minimally Invasive Mitral Valve Surgery in High-Risk Patients? A Meta-Analysis of Observational Studies
2016
Background. Minimally invasive valve surgery is related to certain better postoperative outcomes. We aimed to assess the role of minimally invasive mitral valve surgery in high-risk patients. Methods. A systematic literature review identified eight studies of which seven fulfilled criteria for metaanalysis. Outcomes for a total of 1,254 patients (731 were conventional standard sternotomy and 523 were minimally invasive mitral valve surgery) were submitted to meta-analysis using random effects modeling. Heterogeneity and subgroup analysis with quality scoring were assessed. The primary end point was early mortality. Secondary end points were intraoperative and postoperative outcomes and long…
Electrophysiologic and inotropic effects of alpha-adrenoceptor stimulation in human isolated atrial heart muscle.
1992
The effects of α-adrenoceptor stimulation on force of contraction were investigated in human atrial heart muscle and compared with those of β-adrenoceptor stimulation. The maximal positive inotropic effect produced by stimulation of α-adrenoceptors with phenylephrine (in the presence of atenolol 10 μmol/l) was significantly smaller than that seen in response to β-adrenoceptor stimulation with isoprenaline. The maximal effect of phenylephrine (25% of the maximal effect of isoprenaline) required far higher concentrations (1 mmol/l) than isoprenaline (100 nmol/l); the EC50 values amounted to 33.1 μmol/l and 3.3 nmol/l, respectively. In the presence of the α-adrenoceptor blocking agent phentola…
Differential electrophysiologic and inotropic effects of phenylephrine in atrial and ventricular heart muscle preparations from rats.
1991
Stimulation of alpha 1-adrenoceptors evokes a different pattern of inotropic responses in atrial and ventricular heart muscle preparations from rats. The inotropic effects are accompanied by different changes in membrane potential. In an attempt to clarify the question whether or to which extent these events are causally related, the effects of phenylephrine on force of contraction, transmembrane potential, Ca2+ current (ICa) and K+ currents were comparatively studied in either tissue. In atrial preparations, phenylephrine 10 mumol/l caused an increase in force of contraction, a marked prolongation of the action potential duration and a depolarization of the membrane at rest. In the ventric…
Papaverine enhances the negative inotropic effect of acetylcholine in rat auricles
1978
The negative inotropic effect of acetylcholine in rat left auricles is enhanced in the presence of the phosphodiesterase inhibitor papaverine. This result favours the idea of a cyclic GMP-mediated action of acetylcholine in the heart.
Cyclic AMP and cyclic GMP may play opposing roles in influencing force of contraction in mammalian myocardium.
1976
CYCLIC AMP and cyclic GMP have been suggested to play opposing regulatory roles in several biological systems1. Supporting evidence for the yin yang hypothesis of opposing biological regulation has been obtained in sympathetic ganglia2,3 and pyramidal neurones in the rat cerebral cortex4. In the mammalian heart, the role of cyclic AMP in mediating the positive inotropic response to catecholamines was advanced by the observation that the inotropic effect was preceded by an increase in cyclic AMP levels5. On the other hand, the levels of cyclic GMP were found to be increased after cholinergic stimulation6. In frog, oscillations of cyclic AMP7 and cyclic changes in the levels of cyclic AMP and…
�ber die positiv inotrope Wirkung von Dibutyryl-3?,5?-AMP an isolierten Rattenvorh�fen
1972
It is concluded that the positive inotropic action of DB-AMP—at least in isolated rat atria—may resemble that of adrenaline or theophylline in some points, e.g. with regard to its dependence on the [Ca]e. But as no positive inotropic effect could be observed in guinea-pig atria and as the mechanism by which DB-AMP augments contractile force remains obscure, the results are not thought to necessarily support the view that the effects of adrenaline or theophylline on contractile behaviour of mammalian cardiac muscle occur via cyclic AMP.