Papers by VALÉRIA ALVARES
Kidney and Blood Pressure Research, 2018
Background/Aims: Hyperphosphatemia is associated with high mortality rate in patients on dialysis... more Background/Aims: Hyperphosphatemia is associated with high mortality rate in patients on dialysis. Conventional hemodialysis (HD) is a limit technique in removing phosphate (P). There is a widespread belief that P is removed mainly in the first hour of HD. The aim of this study was to certify the percentage of 1-hour removal of P as compared to the entire procedure. Methods: data from the first dialysis of the week of 21 patients (13 men, age 44±15 years), for 3 consecutive dialysis sessions were evaluated. Fresh dialysate samples were collected at 1 hour and at the end of the session from a partial spent dialysate collection method. Results: Pre dialysis serum P was 4.7±1.7 mg/dl. Reduction rate of serum P was 47.4 ± 14.3 and 45.1 ± 10.8% in 1- and 4-hour of HD, respectively (p=0.322). P removal was 194 (145, 242) mg in 1-hour (p<0.0001), which represents 25.0 ± 0.2% of the total removed during the entire HD. Patients with pre dialysis P ≥ 5.5mg/dl had higher P removal during HD...
American journal of nephrology, Jan 14, 2017
Conventional hemodialysis (HD) is associated with dialysis-induced hypotension (DIH) and ineffect... more Conventional hemodialysis (HD) is associated with dialysis-induced hypotension (DIH) and ineffective phosphate removal. As the main source of extracellular fluid removed during HD are the legs, we sought to reduce DIH and increase phosphate removal by using cycling and pneumatic compression, which would potentially provide higher venous return, preserving central blood flow and also offering more phosphate to the dialyzer. We evaluated 21 patients in a randomized crossover fashion in which each patient underwent 3 different HD: control; cycling exercise during the first 60 min; and pneumatic compression during the first 60 min. Data obtained included bioelectrical impedance, hourly blood pressure measurement, biochemical parameters, and direct quantification of phosphate through the dialysate. DIH was defined as a drop in mean arterial pressure (MAP) ≥20 mm Hg. There was no difference in the ultrafiltration rate (p = 0.628), delta weight (p = 0.415), delta of total, intra and extrac...
Jornal Brasileiro de Nefrologia, 2014
Palavras-chave: frutas; lesão renal aguda; oxalato de cálcio.
A compressão pneumática durante a primeira hora de diálise foi associada a menor HID, embora não ... more A compressão pneumática durante a primeira hora de diálise foi associada a menor HID, embora não tenha sido observado efeito nos parâmetros de distribuição de fluidos. Nenhuma das intervenções testadas, seja exercício ou compressão pneumática conseguiu aumentar a remoção de fosfato. Descritores: diálise renal; fósforo; dispositivos de compressão pneumática intermitente; exercício; hemodinâmica; extração líquido-líquido.
Revista portuguesa de cardiologia : orgao oficial da Sociedade Portuguesa de Cardiologia = Portuguese journal of cardiology : an official journal of the Portuguese Society of Cardiology, 2018
Individuals with glomerular filtration rate (GFR) ≥60 ml/min/1.73 m estimated by the Cockcroft-Ga... more Individuals with glomerular filtration rate (GFR) ≥60 ml/min/1.73 m estimated by the Cockcroft-Gault formula (CG) who undergo percutaneous coronary intervention (PCI) frequently develop contrast-induced nephropathy (CIN). This study aimed to assess whether individuals with significant renal impairment assessed by the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) formula, but not by CG, more often develop CIN following PCI than those without renal impairment by either formula. In this cross-sectional study analyzing patients with baseline CG GFR ≥60 ml/min/1.73 m before PCI, subjects were divided into two groups according to CIN occurrence. Baseline CKD-EPI GFR was calculated for all patients. We analyzed 140 patients. Baseline GFR was 87.5±21.3 and 77.1±15.0 ml/min/1.73 m for CG and CKD-EPI, respectively. CIN occurred in 84.6% of individuals with baseline CKD-EPI GFR <60 ml/min/1.73 m vs. 51.1% of those without. Males and those with higher body mass index were more ...
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Papers by VALÉRIA ALVARES