ObjectivePrimary percutaneous coronary intervention (P-PCI) has demonstrated its efficacy in patients with ST segment elevation myocardial infarction (STEMI). However, patients with STEMI ≥75 years receive less P-PCI than younger patients despite their higher in-hospital morbimortality. The objective of this analysis was to determine the effectiveness of P-PCI in patients with STEMI ≥75 years.MethodsWe included 979 patients with STEMI ≥75 years, from the ATención HOspitalaria del Síndrome coronario study, a registry of 8142 consecutive patients with acute coronary syndrome admitted at 31 Spanish hospitals in 2014–2016. We calculated a propensity score (PS) for the indication of P-PCI. Patients that received or not P-PCI were matched by PS. Using logistic regression, we compared the effectiveness of performing P-PCI versus non-performance for the composite primary event, which included death, reinfarction, acute pulmonary oedema or cardiogenic shock during hospitalisation.ResultsOf the included patients, 81.5 % received P-PCI. The matching provided two groups of 169 patients with and without P-PCI. Compared with its non-performance, P-PCI presented a composite event OR adjusted by PS of 0.55 (95% CI 0.34 to 0.89).ConclusionsReceiving a P-PCI was significantly associated with a reduced risk of major intrahospital complications in patients with STEMI aged 75 years or older.
El objetivo de este trabajo fue innovar el diseño de un cojinete Kingsbury de empuje axial para bombas centrífugas verticales sumergibles, utilizando vidrio como material resistente a la fricción entre el disco giratorio y los patines, con la finalidad de aumentar su vida útil y ahorrar intensidad de corriente. Se determinaron los parámetros de explotación como flujo volumétrico que entra en el patín, presión máxima de empuje y coeficiente de carga máxima, entre otros. Para las 124 bombas sumergibles ensayadas, los resultados presentaron un incremento promedio de 3,11 años en su vida útil y un ahorro promedio de 2,5 ampere por bomba cuando operaron con cojinetes de vidrio respecto de los cojinetes convencionales de fábrica. Palabras clave: cojinete Kingsbury, diseño, vidrio, vida útil, bombas sumergibles. ABSTRAC The aim of this work was to innovate the design of an axial thrust Kingsbury bearing for submersible vertical centrifugal pumps, using glass as a friction resistant material between the rotating disc and the skids, in order to increase its useful life and save energy intensity current. The exploitation parameters were determined as volumetric flow entering the skid, maximum thrust pressure and maximum load coefficient, among others. For the 124 submersible pumps tested, the results showed an average increase of 3.11 years in their useful life and an average saving of 2.5 ampere for each pump when they operated with glass bearings with respect to the conventional bearings of fabric.
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