561 research outputs found
Qualitative study of the zooplankton in the Sidi selem dam
No full textLe zooplacton des eaux du barrage de Sidi sSelem(Nord de la Tunisie est etudie sur des echantillons mensuels recoltes par des traits verticaux(0-5m). La densite zooplactonique totale a oscille autour d'une moyenne de 80 individus/litre d'eaux avec un maximum de 193 et 191 individus par ltre(Aout) et un minimum de 0,5 individus/litre(Decembre). La composition specifique est pauvre (17 especes). Elle se caracterise par l'abondance de copepodes (51%) principalement Copidodiaptomus numudicus, Arctodiaptomus salinus et de cladocere (43%) essentielement representes par Diaphanosoma brachyurum(37%). La diversite specifique qui varie d'un cycle saisonnier a un autre et d'une station a une autre montre que l'ecologie du barrage de Sidi Selem se caracterise par le passage progressif dans l'espace(embouchure des oueds - milieu barrage) et dans le temps du facies lotique au facies limniqueThe zooplankton samples of Sidi Selem reservoir (North of Tunisia) obtained by vertical training (0-5m) have been studied monthly. The total density of zooplankton varied around an average of 80 ind/l from a maxima of 193 and 191 ind./l (August) and the minima of 0,5 ind./l (December). The species composition is poor (17 species). It is characterised by the abundance of copepods (51%), mainly the species of Copidodiaptomus numudicus, Arctodiaptomus salinus, and cladocerans (43%) essentially represented by Diaphanosoma brachyurum. The variation of specific diversity with seasons and stations has proved that ecology of the reservoir is characterised by space (mouth of river-reservoir center) and temporal gradual evolution from lotic facies to limnic faciesPublishe
Noninvasive detection of accelerated stenotic flow in the entire left anterior descending coronary artery provides insights into the causes of impaired coronary flow reserve
No full textVariazioni di nicchia trofica in un rapporto competitivo tra Asellus aquaticus (L.) e Proasellus coxalis disturbo fisico, vita simpatrica e disponibilita' trofiche.
No full textEvaluation of microvascular reperfusion by ST segment resolution and coronary flow reserve after recanalized acute anterior myocardial infarction
No full textREDUCED MICROVASCULAR AND MYOCARDIAL DAMAGE IN PATIENTS WITH ACUTE MYOCARDIAL INFARCTION AND PREINFARCTION ANGINA.
No full textQuantification of left ventricular function with contrast-enhanced harmonic colour Doppler and a semiautomated boundary detection algorithm in technically difficult patients: feasibility, accuracy, and inter-observer variability
No full textIntravenous adenosine during coronary flow reserve assessment: is 90-second infusion sufficient for maximal coronary vasodilatation?
No full textCoronary steal detected noninvasively by contrast-enhanced transthoracic harmonic color Doppler echocardiography
No full textCoronary flow reserve is correlated with no-reflow phenomenon and has predictive value of myocardial viability in patients with reperfused acute anterior myocardial infarction
No full textReduced microvascular and myocardial damage in patients with acute myocardial infarction and preinfarction angina
No full textBackground After acute myocardial infarction, the presence of ischemic preconditioning as a result of preinfarction angina has a protective role, limiting necrosis extent and guaranteeing greater myocardial functional recovery. The rela- tionship between preinfarction angina, microvascular reflow, and myocardial function is poorly known. We hypothesized that after acute myocardial infarction patients with preinfarction angina have both microvascular integrity and myocardial function preservation.
Methods and Results In 51 patients with a first acute myocardial infarction, we noninvasively assessed micro- vascular perfusion and coronary flow reserve with intravenous myocardial contrast echocardiography and investigated myocardial contractile recovery with low-dose dobutamine and 90-day follow-up echocardiography. Typical angina was present in 25 patients and absent in 26 patients during the 7 days preceding the myocardial infarction. Compared with those patients without preinfarction angina, patients with preinfarction angina showed a greater microvascular reflow ex- tent and coronary flow reserve (respectively, 25.2% 22.8% vs 48.3% 23.3%, P .05, and 3.44 0.75 vs
1.95 0.67, P .0001), a better regional myocardial function, as expressed with wall motion score index in the risk area at dobutamine (1.67 0.61 vs 2.10 0.43, P .005) and at follow-up (1.72 0.56 vs 2.22 0.40, P .0001) echocardiogram, despite being similar in the first echocardiogram (2.60 0.28 vs 2.63 0.28, P not signifi- cant), and significantly less pronounced left ventricular dilation at follow-up.
Conclusion Presence of preinfarction angina, because of the preconditioning effect, reduces myocardial damage and favors myocardial viability, limiting left ventricular remodeling. This beneficial effect seems to be at least partly medi- ated by the more preserved microvascular integrity and functional vasodilation after acute myocardial infarctio
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