Daniel Ariza

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BACKGROUND Postoperative nosocomial infection (PNI) is a severe complication in surgical patients. Known risk factors of PNI such as allogeneic blood transfusions (ABTs), anemia, and iron deficiency are manageable with perioperative intravenous (IV) iron therapy. To address potential concerns about IV iron and the risk of PNI, we studied a large series of(More)
BACKGROUND In patients undergoing total knee replacement (TKR) most blood loss occurs postoperatively and return of unwashed filtered shed blood (USB) from postoperative drainage may represent an alternative to allogeneic blood transfusion (ABT). We evaluated the impact of USB return, with or without leucocytes, on the acute-phase response (APR) after TKR.(More)
In patients undergoing total knee replacement (TKR), most of the measured blood loss occurs during the postoperative period, and 30–50% of these patients receive allogeneic blood transfusion (ABT). For this reason, the salvage and return of unwashed filtered shed blood (USB) from postoperative drainage may represent an alternative to ABT in these patients.(More)
INTRODUCTION Requirements for allogeneic blood transfusion (ABT) after total knee replacement (TKR) are still high (30-50%), and salvage of unwashed filtered postoperative shed blood (USB) may represent an alternative to ABT. We evaluated that patients are more likely to benefit of USB reinfusion after TKR. PATIENTS AND METHODS Data from 581 consecutive(More)
In this paper a working hypothesis was proposed: If an air stream can remove the corona space charge close to a corona source, then the corona current is modified in a different manner in different types of corona electrodes. This phenomenon must be polarity dependent. To test this hypothesis two types of corona electrodes were tested: a cactus-like and a(More)
To study the influence of the wind speed on the generation of corona current in two different needles, a wind tunnel was designed and constructed. Needles were tested in a point-to-plane arrangement under laminar air flow. A constant background voltage is applied to the electrode arrangement, while air velocity varied from 0 m/s up to 16 m/s, a wind(More)
In order to develop an algorithm to predict thunderstorms, atmospheric data is continuously recorded in Bogota Colombia, from July to November, 2011. The recorded variables are corona current, natural electric field, atmospheric pressure, ambient temperature and air humidity. From this large amount of recorded data, 22 thunderstorm events are selected to be(More)
BACKGROUND In patients undergoing total knee replacement (TKR), most blood loss occurs post-operatively, and the return of unwashed filtered shed blood (USB) from post-operative drainage may represent an alternative to allogeneic blood transfusion (ABT). We evaluated the impact of USB return on the cellular immune response (CIR) after TKR. PATIENTS AND(More)
In this work two important differences between the expected behavior of the corona current as a function of the electric field when measured in the laboratory and under natural thunderstorm conditions are reported. The first difference is related to a non-linear increase of the corona current when the natural electric field increases. The second is a delay(More)