Surveillance of hemodialysis related infections: a prospective multicenter study.

As in many countries, there is neither a surveillance system nor a study to reveal the hemodialysis (HD) related infection rates in Turkey. We aimed to investigate the infection rate among HD outpatients and implement CDC's surveillance system. A multicenter prospective surveillance study is performed to investigate the infection rate among HD patients. CDC National Healthcare Safety Network (NHSN) dialysis event (DE) protocol is adopted for definitions and reporting. During April 2016-April 2018, 9 centers reported data. A total of 199 DEs reported in 10,035 patient-months, and the overall DE rate was 1.98 per 100 patient-months. Risk of blood culture positivity is found to be 17.6 times higher when hemodialysis was through a tunneled catheter than through an arteriovenous fistula. DE rate was significantly lower in patients educated about the care of their vascular access site. Staphylococcus aureus was the most causative microorganism among mortal patients. Outcomes of DEs were hospitalization (73%), loss of vascular access (18.2%), and death (7.7%). This first surveillance study revealed the baseline status of HD related infections in Turkey and showed that CDC National Healthcare Safety Network (NHSN) DE surveillance system can be easily implemented even in a high workload dialysis unit and be adopted as a nationwide DE surveillance program.

Pulmonary hypertension in hemodialysis patients without arteriovenous fistula: the effect of dialyzer composition.

Pulmonary hypertension (PHT) increases mortality rate in hemodialysis (HD) patients. Numerous clinical, hemodynamic, and metabolic abnormalities have been suggested to be associated with the development of PHT in HD patients. We aimed to investigate the acute effects of two different dialyzer membranes on pulmonary arterial pressure (PAP) throughout a HD session in maintenance HD patients. Seventy-four HD patients dialyzed through permanent tunneled jugular central venous catheter were enrolled. A first-use cellulose acetate and high-flux polysulfone dialysis membrane were tested using a crossover design. For each membrane, pre- and post-dialysis pulmonary artery pressures were measured echocardiographically. Elevated pulmonary artery pressure was observed in 68.8% of patients (n = 51), whereas mild PHT was observed in 28.3% of patients (n = 21) and moderate PHT in 40.5% (n = 30). Decrease in pulmonary artery pressure following HD procedure performed using high-flux polysulfone membrane was significantly higher than the decrease observed following HD procedure performed using cellulose acetate membrane (p < 0.05). Significant decrease in pulmonary artery pressures was observed only after HD procedures performed using high-flux polysulfone membrane (p < 0.05). Ultrafiltered volume was only significantly correlated with the decrease in pulmonary artery pressure observed after HD procedure performed through high-flux polysulfone membrane (ß = 0.411, p < 0.05). PHT seems to be prevalent among HD patients even in the absence of AV fistula and abnormal cardiac functions. Membrane composition seems to be important, which may overwhelm the improving effects of ultrafiltration.

Nephrotic-range proteinuria with small glomerular fibrillary deposits in a patient on diphenylhydantoin treatment.

BACKGROUND: Although the exact role of the diphenylhydantoin treatment on the immune system is still unclear, prolonged administration of diphenylhydantoin has been suggested to be associated with immune-based disorders and syndromes. CASE REPORT: A case of fibrillary glomerulonephritis associated with DPH treatment is reported. This is the first reported case of fibrillary glomerulonephritis associated with this commonly used common anticonvulsive drug. CONCLUSIONS: A more routine surveillance for proteinuria in patients receiving DPH is recommended.

Posterior leukoencephalopathy and nephrotic syndrome: just a coincidence?

Posterior leukoencephalopathy syndrome (PLES) is an acute neurological disorder. The most plausible hypothesis for the pathophysiology of PLES is the loss of autoregulation and consequent vasogenic edema. PLES is mostly attributed to severe or sudden elevations of arterial blood pressure. A number of reports, however, describe patients with PLES without severe hypertension. This report presents two patients with nephrotic syndrome who developed PLES without customarily severe hypertension. Proteinuria, low levels of serum albumin, or generalized increase in capillary permeability in nephrotic syndrome can initiate PLES with moderately high arterial blood pressure levels. PLES is increasingly recognized by neurologists, but it should also be remembered by internists when confronted with patients with nephrotic syndrome who present with neurological symptoms, whether or not they have severe hypertension.

Once-monthly continuous erythropoietin receptor activator (CERA) for haemoglobin maintenance in haemodialysis patients with chronic renal anaemia.

BACKGROUND: This study was conducted to evaluate the efficacy and safety of once-monthly continuous erythropoietin receptor activator (CERA) for maintenance of stable haemoglobin (Hb) levels in adult chronic renal anaemia patients on dialysis according to local clinical judgment in Turkey. METHODS: This was a prospective, open-label, single-arm, multi-centre study conducted in 20 centres in Turkey. After a 4-week screening period, eligible patients receiving conventional erythropoiesis-stimulating agents were converted to monthly intravenous CERA and entered a 16-week CERA dose-titration period (DTP) followed by an 8-week efficacy evaluation period (EEP) and a 4-week safety follow-up. The primary endpoint was the proportion of patients whose Hb concentration remained stable within ±1.0 g/dL of their reference Hb and within the range of 10.0-12.0 g/dL during the EEP. RESULTS: A total of 173 patients were screened, 132 entered the DTP and 84 completed the study. Thirty-nine patients [46.4% (95% confidence interval: 35.5-57.7%)] maintained stable target Hb concentrations. The mean change in time-adjusted average Hb concentration was 0.29 ± 1.08 g/dL between baseline and the EEP. The mean CERA monthly dose was 112.4 ± 76.78 µg during the EEP, and the CERA dose was adjusted in 39 patients (36.4%). Eleven patients (8.4%) reported 13 treatment-related adverse events, the most frequent adverse events being infections and infestations, gastrointestinal and vascular disorders. CONCLUSIONS: Once-monthly CERA maintains stable Hb concentrations in chronic renal anaemia patients on dialysis in Turkey. The study results confirm the known efficacy and safety profile of CERA.

Successful treatment of resistant antiglomerular basement membrane antibody positivity with mycophenolic acid.

Anti-glomerular basement membrane (GBM) antibody disease may progress to end-stage renal failure, requiring either dialysis or renal transplantation. In patients with end-stage renal disease (ESRD) due to anti-GBM-ab disease, the recurrence rate after transplantation is as high as 50% (2) and delaying renal transplantation until circulating anti-GBM antibody levels have been undetectable for at least 12 months reduces the recurrence rate to 5-15%. We report a case of ESRD due to renal limited anti-GBM disease with circulating anti-GBM-ab resistant to standard treatment approach who achieved undetectable anti-GBM-ab with mycophenolic acid.

Successful treatment of enterocutaneous fistula in a hemodialysis patient with somatostatin.

Although cysticercosis is the most common parasitic disease affecting the central nervous system, spinal cysticercosis is rare. A rare form of spinal cysticercosis involving the whole spinal canal is presented. A 45-year-old Korean male had a history of intracranial cysticercosis and showed progressive paraparesis. Spinal magnetic resonance scan showed multiple cysts compressing the spinal cord from C1 to L1. Three different levels (C1-2, T1-3, and T11-L1) required operation. Histopathological examination confirmed cysticercosis. The patient improved markedly after surgery.

TNF alpha-308 genotype and renin-angiotensin system in hemodialysis patients: an effect on inflammatory cytokine levels?

BACKGROUND: Renin-angiotensin system (RAS) was suggested to modulate inflammatory cytokine production. Angiotensin II was consistently shown to increase production of tumor necrosis factor alpha (TNF-alpha). However, inflammatory cytokines and RAS were modulated by genetic polymorphisms such as TNF-alpha-308 G > A and angiotensin-converting enzyme (ACE) I/D gene polymorphisms. The aim of this study was to investigate the effects of ACE and TNF-alpha genotypes on inflammatory cytokines in hemodialysis (HD) patients. METHODS: ACE I/D and TNF-alpha-308 G > A genotypes, pre- and postdialysis plasma renin activity (PRA), serum ACE, interleukin-1 beta (IL-1beta), and TNF-alpha levels were determined in 22 HD patients. RESULTS: Predialysis serum ACE activity is correlated with TNF-alpha (r = 0.63; P = 0.01), and PRA was correlated with IL-1beta levels (r = 0.49; P = 0.02). Pre/postdialysis IL-1beta and TNF-alpha were similar in DD and II/ID ACE genotypes. Predialysis TNF-alpha and IL-1beta (32.4 +/- 5; 35.1 +/- 4.2 vs. 28.1 +/- 3.7; 26.5 +/- 6.2 pg/mL; P < 0.05) and postdialysis TNF-alpha levels (30.4 +/- 1.4 vs. 28.4 +/- 0.82 pg/mL; P < 0.05) were significantly higher in TNF1/2 than TNF1/1 patients. CONCLUSION: ACE and TNF-alpha-308 G > A (1/2) gene polymorphisms may contribute to modulation of proinflammatory cytokine production and hence chronic inflammation in HD patients.

Two episodes of anuria and acute pulmonary edema in a losartan-treated patient with solitary kidney.

Atherosclerotic renal artery stenosis (RAS) is an increasingly important cause of end-stage kidney disease, and may cause hypertension, progressive renal failure, and recurrent pulmonary edema. Herein, we report two episodes of anuria and acute pulmonary edema associated with losartan treatment in a hypertensive patient with preexisting severe renal artery stenosis in a solitary kidney. After successful percutaneous renal balloon angioplasty procedure, urine flow was started immediately, despite 10 days of anuria. Blood pressure measurements were still at acceptable levels with a low dose Beta blocker, and serum creatinine levels were normal even after eight months. PTRA should be done in such patients, even with prolonged anuria. Physicians who recommend angiotensin receptor blockers in patients with RAS, especially in patients wih hypovolemia or a solitary kidney, should be careful about this complication.

Apolipoprotein E gene polymorphism in renal transplant recipients: effects on lipid metabolism, atherosclerosis and allograft function.

INTRODUCTION: Atherosclerosis is a serious complication and leading cause of mortality in renal transplant recipients (RTRs). Hyperlipidemia may be associated with progression of renal disease and chronic allograft dysfunction. Similarities in the pathogenesis of glomerulosclerosis and atherosclerosis have been proposed. Apolipoprotein (apo) E gene code forms three major isoforms (E2, E3, and E4) with variable effects on lipid metabolism. PATIENTS AND METHODS: A total of 118 patients, at a mean age of 40 +/- 8 yr, were included in the study. Apo E genotyping was carried out on genomic DNA using polymerase chain reaction and restriction enzyme. Carotid artery intima media thickness and atherosclerotic plaques were evaluated by B-mode ultrasonography. The plasma levels of lipids and lipoproteins and acute phase reactants were also studied. Allograft function was evaluated by measuring serum creatinine and creatinine clearance values. RESULTS: The frequencies of E2, E3, and E4 alleles were 0.10, 0.78, and 0.12 respectively. Carotid artery atherosclerosis was found in 25% of E2 carriers, 30% of E3 carriers, and 57% of E4 carriers. Total cholesterol, total triglyceride, low-density lipoprotein, very low-density lipoprotein, apo B 100 levels were found to be higher in apo E4 carriers. Median apo A1 level was higher and allograft functions were better in apo E2 carriers (p < 0.05). Multiple regression analysis showed that allograft functions were negatively correlated with elevated acute phase reactants (p < 0.01) and only the age, but not the apo E genotypes, was an independent risk factor for atherosclerotic vascular disease (p < 0.01). DISCUSSION: The pathogenetic events linking lipid metabolism and allograft functions and development of atherosclerosis are complex and multifactorial in RTRs. Our results showed that apo E genotypes have influences on lipids, lipoproteins and allograft functions. The ultimate role of apo E4 gene polymorphism as a risk factor for development and progression of atherosclerosis in RTRs should be sought in further studies.

Association between activated renin angiotensin system and bone formation in hemodialysis patients: is the bone mass genetically determined by ACE gene polymorphism?

BACKGROUND: Angiotensin II (ang II) receptor subtype I binding sites has been recently demonstrated on bone cell precursors. Ang II stimulates DNA and collagen synthesis in human adult bone cells. The aim of this study is to evaluate the role of renin angiotensin system in the bone metabolism and to address the genetic influence of angiotensin converting enzyme (ACE) gene polymorphism on bone mass in hemodialysis patients. METHODS: Forty-eight end-stage renal disease patients (28 male, 20 female mean age 42+/-13 years,) on maintenance hemodialysis were included in the study. Bone mineral density (BMD) was estimated at lumbar spine and T score worse than -1.5 were considered as osteopenia. Serum parathyroid hormone (iPTH) and osteocalcin (OC), bone alkaline phosphatase (bAP) and carboxy terminal propeptide type 1 collagen (PICP) levels were measured as markers of bone metabolism. Plasma renin activity (PRA), serum ACE activity and ACE gene polymorphism (II, ID, DD) were determined. RESULTS: Bone mineral density and T score of the hemodialysis patients were 0.92+/-0.17 g/cm2 and -1.36+/-1.50, respectively. Twenty-one patients (43,7%) were osteopenic (T score worse than -1.5) and mean T score of osteopenic patients was -2.72+/-0.72. T score of nonosteopenic group was -0.29+/-0.99. Serum calcium, serum, phosphorus, serum OC, serum bAP, serum PCIP, serum PTH levels were similar in osteopenics and nonosteopenics. No difference was observed in predialysis PRA and in both pre- and postdialysis serum ACE activity of patients in both groups. PRA after hemodialysis in nonosteopenic group was higher than osteopenics (p<0.05). Percent increment in PRA in hemodialysis patients was correlated with T score (R=0.48 p <0.05). Serum ACE activity was positively correlated with serum iPTH (R=0.29, p=0.02), serum OC (R=0.35, p=0.01), serum bAP (R=0.34, p=0.01), serum PCIP (R=0.36, p=0.01). T score (-0.7+/-1.5, vs -1.7+/-1.3 p <0.05) was higher in DD group (n=19) compared to II+ID group (n=29). CONCLUSIONS: Association of biochemical and radiological signs of increased bone formation with activated RAS in hemodialysis patients might be an evidence for the involvement of this system in the regulation of bone metabolism.