Ramón Roca-Tey

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BACKGROUND Periodic intra-access blood flow rate (QA) monitoring is the preferred method for vascular access (VA) surveillance (NKF-K/DOQI, update 2000). OBJECTIVES 1) To determine the ultrafiltration (UF) method accuracy for early detection of VA stenosis. 2) To evaluate the hemodynamic effect of elective VA intervention (angioplasty or surgery). 3) To(More)
JAPI • VOL. 51 • JULY 2003 smear shows red cell fragments, schistocytes, and helmet cells suggestive of hemolysis. Other features suggestive of MAHA are reticulocytosis, indirect hyperbilirubinina, hemoglobinuria, nucleated red cells and increased LDH. Coagulation parameters are normal except increased FDP. Histopathology shows hyaline thrombi and(More)
INTRODUCTION Periodic QA measurement is the preferred way for VA surveillance in end-stage renal disease (ESRD) patients (pts). OBJECTIVE The aims of this study were to measure QA by TDT and to compare the functional results with Delta-H method. PATIENTS AND METHODS We measured Q(A) non invasively in 38 VA (mean VA duration: 48.7 +/- 69.8 months) during(More)
PURPOSE Arteriovenous fístula is the best vascular access (VA) for hemodialysis. We analyzed the VA used at first session and the factors associated with the likelihood to start hemodialysis by fistula in 2000-2011. METHODS Data of VA type were obtained in 9,956 incident hemodialysis patients from the Catalan Registry. RESULTS Overall, 47.9% of patients(More)
INTRODUCTION The color Doppler ultrasonography (CDU) is a noninvasive vascular access (VA) monitoring technique that provides both structural and hemodynamic information from VA. On the other hand, the delta-H (AH) method is another noninvasive technique that measures the VA blood flow rate during hemodialysis (HD). OBJECTIVE 1) To analyze some anatomic(More)
INTRODUCTION The CDU is a noninvasive vascular access (VA) monitoring technique that provides both structural and hemodynamic information from vessels. OBJECTIVE The aim of this prospective study was to analyze some parameters of forearm vessels by CDU before and after RCF creation at the wrist. PATIENTS AND METHODS We explored by CDU the vessels of(More)
INTRODUCTION Vascular calcification is a common finding in patients (pts) with end-stage renal disease (ESRD). OBJECTIVE The aim of this cross-sectional study was to investigate the prevalence and functional effect of native arteriovenous fistula AVF (feeding artery and/or arterialized vein) calcifications evaluated by spiral computed tomography (CT) in(More)
OBJECTIVE The aim of this study was to know the prevalence and functional profile of RA stenosis in RCF dysfunction detected as a result of our surveillance programme. PATIENTS AND METHODS We prospectively monitored QA of 116 VA (arteriovenous fistula 81% or graft 19%; mean VA duration 28.2 +/- 52.9 months) during hemodiaysis (HD) in 102 ESRD (mean age(More)
Heart failure (HF) is the most frequent cardiovascular disease associated with chronic kidney disease and represents a high risk for cardiovascular mortality in incident hemodialysis (HD) patients. This risk is especially high during the arteriovenous fistula (AVF) maturation period due to the marked hemodynamic changes related to the large increase in the(More)