BACKGROUND
The DyeVert™ system (Osprey Medical Inc., Minnesota, MN) may reduce contrast media (CM) volume during coronary procedures while maintaining fluoroscopic image quality. Here, we assessed whether the use of the DyeVert system reduces acute kidney injury (AKI) rate in patients with acute coronary syndrome (ACS) undergoing invasive coronary procedures.
METHODS
ACS patients scheduled for coronary procedure from January 2017 to December 2019 were included. Two groups were identified: (a) Control group (n = 339), including patients in which a conventional manual injection syringe was used; and (b) DyeVert group (n = 112), in which CM injection was handled by the DyeVert™ system. A propensity score matching was performed to reduce the effect of treatment selection bias and potential confounders. In all cases, a low‐osmolar, nonionic CM was administered. The primary objective was the rate of AKI, defined as a serum creatinine increase ≥0.3 mg/dl within 72 hr after CM exposure.
RESULTS
CM volume was higher in the Control group than in the DyeVert group (130 [120–188] ml vs. 99 [69–136] ml; p <.001). In the DyeVert group the mean percent CM volume saved was 38 ± 13%. AKI occurred in 7/90 patients (8%) in the DyeVert group and in 17/90 (19%) patients in the Control group (odds ratio = 0.37; 95% confidence interval 0.14–0.95; p =.047).
CONCLUSIONS
This preliminary result suggests that CM volume reduction obtained by the DyeVert™ system is an effective strategy to prevent AKI in ACS patients undergoing invasive procedure.
AbstractsAs until now proposed in the literature, in the local energy calculations we can distinguish "few-points" procedures, in which the number M of configurational points is strictly related to the number N of trial functions used, and statistical "many-points" procedures, in which the number M of points can be arbitrarily increased. In this gaper we demonstrate that the energy errors resulting from a "many-points" calc'ulation M points/N functions ( M > N ) can be connected in a simple way with the errors ofthe partial calculations N pointslN functions.This suggests a possible approach for the problem of the choice of the configurational points to be introduced in the calculation, and leads to a simple interpretation of the numerical meaning of the error associated with the ordinary Ritz energy. Numerical examples on the hydrogen atom are reported.
(13Les calculs des energies locales qu'on peut trouver dans la littkrature peuvent &re partages dans des proc6des "a peu de points," dans lesquels le nombre M de points est exactement determine par le nombre N des fonctions utilisees, et dans des procedks statistiques "a plusieurs points" dans lesquels on peut augmenter M a volontt. Dam ce travail nous demontrons que les errcurs dans lee Cnergies qu'on comecte a un caicul *'a plusieurs points" A4 pointsIN fonetions ( M > N ) peuvent etre reliees simplement avec les erreurs des ( : ) calculs "partiaux" N pointslN fonctions.Cette relation porte un nouve approchment au prablkme du choix des points qu'on doit introduire dans les calculs locaux, et permet ainsi une simple interpretation des erreurs assocites & la mtthode bien connue de Ritz. Nous donnons des exemples numkriques sur l'atome d'hydrogkne.Die bisher in der Literatur vorgeschlagenen Lokalenergieberechnungen konnen in "wenige-Punkten"-und statistische "viel-Punkten"-Verfahren eingeteilt werden. In den ersten ist die Anzahl M von Konfigurationspunkten streng mit der Anzahl von benutzten Versuchsfunktionen in Verbindung gebracht, wahrend in den anderen die Anzahl M von Punkten beliebig vergrossert werden kann. In diesem Artikel zeigen wir dass die
676MAJORINO AND RUBINO Dieses Ergebnis deutet einen moglichen Angriffspunkt des Problems mit der Wahl von Konfigurationspunkten an und fuhrt auch zu einer einfachen Interpretation der numerischen Bedeutung des Fehlers in der gewohnlichen Ritz-Energie. Numerische Beispiele fur das Wasserstoffatom werden gegeben.
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