A new technique for measuring fistula flow using venous blood gas oxygen saturation in patients with a central venous catheter

Background. Doppler ultrasound (DU) monitoring early after arteriovenous fistula (AVF) creation allows the identification of low blood flow (Qa) requiring prompt revision, but it is costly (needs skilled operators and technical instruments) and is not available in all dialysis units. Therefore alternative first-line methods to measure Qa would be welcomed.We reasoned that once an AVF is created, an increment in central venous oxygen saturation (ScvO2) is predictable and proportional to Qa. Methods. Accordingly, in patients receiving dialysis through a central venous catheter (CVC) in whom an AVF was created, we measured, by means of blood gas analysis, the ScvO2 increment before and after manual compression of the arteriovenous shunt and verified its correlation with DU-measured Qa. Results. We sampled blood gas in 18 patients with CVC and AVF before and after 30 s manual compression of the AVF. ScvO2 averaged 70.563% before and 65.263% after AVF closure, with an average drop of 5.163% (range 1–12). AVF Qa, which was measured within 24h by means of DU, averaged 6356349 mL/min (range 50–1300) and was strictly and positively correlated with DScvO2 (r ¼ 0.954, P<0.0001). Conclusions. Therefore we suggest that in patients with CVC and a newly created AVF, it is possible to monitor AVF Qa without DU by simply measuring blood gas and DScvO2. This technique is simple, cheap, repeatable, non-invasive and operator independent and represents a new useful screening test to detect delayed AVF access maturation deserving prompt DU measurement and surgical revision. It helps to quickly identify patients in urgent need of DU verification and possible surgical revision. Regrettably, it is applicable only in patients with CVC

Oxygen Extraction Ratio (OER) as a Measurement of Hemodialysis (HD) Induced Tissue Hypoxia: A Pilot Study

HD tissue hypoxia associates with organ dysfunctions. OER, the ratio between SaO2and central-venous-oxygen-saturation, could estimate oxygen requirements during sessions, but no data are available. We evaluated OER behavior in 20 HD patients with permanent central venous catheter (CVC) as vascular access. Pre-HD OER (33.6 ± 1.4%; M ± SE) was higher than normal (range 20-30%). HD sessions increased OER to 39.2 ± 1.5% (M ± SE; p 40%. In HD patients with CVC as vascular access, OER is a cheap, easily measurable and repeatable parameter useful to assess intradialytic hypoxia, and a potential biomarker of HD related stress and morbidity, helpful to recognize patients at increased risk of mortality

Positioning novel biologicals in CKD-mineral and bone disorders

Renal osteodystrophy (ROD), the histologic bone lesions of chronic kidney disease (CKD), is now included in a wider syndrome with laboratory abnormalities of mineral metabolism and extra-skeletal calcifications or CKD-mineral and bone disorders (CKD-MBD), to highlight the increased burden of mortality. Aging people, frequently identified as early CKD, could suffer from either the classical age-related osteoporosis (OP) or ROD. Distinguishing between these two bone diseases may not be easy without bone biopsy. In any case, besides classical therapies for ROD, nephrologists are now challenged by the possibility of using new drugs developed for OP. Importantly, while therapies for ROD mostly aim at controlling parathyroid secretion with bone effects regarded as indirect, new drugs for OP directly modulate bone cells activity. Thus, their action could be useful in specific types of ROD. Parathyroid hormone therapy, which is anabolic in OP, could be useful in renal patients with low turnover bone disease. Denosumab, the monoclonal antibody against receptor activator of NF-κB ligand (RANK-L) that inhibits osteoclast activity and proliferation, could be beneficial in cases with high turnover bone. Use of romosozumab, the monoclonal antibody against sclerostin, which both stimulates osteoblasts and inhibits osteoclasts, could allow both anabolic and anti-resorptive effects. However, we should not forget the systemic role now attributed to CKD-MBD. In fact, therapies targeting bone cells activity could also result in unpredicted extra-bone effects and affect cardiovascular outcomes. In conclusion, the new biologicals established for OP could be useful in renal patients with either OP or ROD. In addition, their potential non-bone effects warrant investigation

Interactions of sclerostin with FGF23, soluble klotho and vitamin D in renal transplantation

Relationships of Sclerostin, a bone anti-anabolic protein, with biomarkers of mineral bone disorders in chronic kidney disease are still unsettled, in particular in kidney transplant (KTR). In 80 KTR patients (31F/49M, 54.7±10.3 years) we studied the relationships of serum Sclerostin with eGFR, Calcium, Phosphate, Alkaline Phosphatase (AP), intact Parathyroid hormone (iPTH), soluble alpha-Klotho (sKlotho), intact Fibroblast Growth Factor 23 (iFGF23), 25-hydroxyvitamin D(25D) and 1,25-dihydroxyvitamin D (1,25D). Thirty healthy subjects (35.0±12.4 years, eGFR 109.1±14.1 ml /min/1,73m2) served as control for Sclerostin, iFGF23 and sKlotho. With a median eGFR of 46.3 mL/min/1.73m2 (IQR, 36.2-58.3) our KTR had median Sclerostin levels of 23.7 pmol/L (IQR: 20.8-32.8), not different from controls (26.6 pmol/L, IQR: 22.0-32.2; p = n.s). Sclerostin correlated negatively with AP (r = -.251; p = 0.023) and positively with iFGF23 (r = .227; p = 0.017) and 25D (r = .214; p = 0.025). Age-adjusted multiple regression analysis identified AP and 1,25D as negative and 25D and sKlotho as positive best predictors of Sclerostin. No correlation was evident with eGFR. The negative correlation with AP confirms the direct anti-anabolic role of Sclerostin. The associations either negative or positive with iFGF23, sKlotho, and vitamin D metabolites suggest also a modulatory role in mineral homeostasis. In particular, the associations with iFGF23 (positive) and 1,25D (negative) underline the relevant inhibitory action of Sclerostin on vitamin D activation. In conclusion, Sclerostin levels in KTR are normal and influenced more by bone turnover than by eGFR. Its involvement with other hormones of mineral homeostasis (FGF23/Klotho and Vitamin D) is part of the sophisticated cross-talk between bone and the kidney

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L'assorbimento del glucosio in dialisi peritoneale: strumenti utili per il team multidisciplinare

Dialysis patients are often affected by protein energy wasting and the maintenance of an optimal nutritional state is a difficult goal to achieve. Moreover protein energy wasting is one of the strongest risk factors for mortality in chronic dialysis patients. To estimate glucose absorption in peritoneal dialysis is essential to determine patient's dietary energy requirements and to prevent possible metabolic complications. The currently accepted methods of estimating glucose absorption are two. The first one is based on the average glucose absorption of continuous ambulatory peritoneal dialysis (CAPD) and is calculated with the Grodstein et al. formula. The second one is based on the Peritoneal equilibration test curves (D/D0 formula, Bodnar et al.) and takes into account transport characteristics. None of the two formulas perfectly calculated the absolute glucose absorption, even if the D/D0 is much closer to the true value, compared to Grodstein et al. formula. In this paper we described the multidisciplinary management experience of peritoneal dialysis patients, with a focus on the estimation of the patient's energy requirements. Analyzing glucose absorption in a systematic way and monitoring the changes in glucose absorption during the time could significantly contribute to adjusting nutritional treatment. However it is always necessary to critically evaluate the results obtained by both formulas

Renal transplant: gender differences

Renal transplantation represents the best treatment for end-stage kidney disease, leading to improved quality of life and life-expectancy for most of the patients. However, gender disparities are evident both in access and in outcomes of kidney transplantation. Women on dialysis are less likely to be on the waiting list for kidney transplantation and to receive an organ from a deceased donor or living donor. Several biological and sociocultural aspects could explain this disparity. On the contrary, more women than men are living kidney donors. Italian women are the first organ donors for living transplants in Europe. The gender difference in living donation is certainly affected by different comorbidities, but such a marked trend highlights a greater predisposition to donate of women, especially in the family context. Some differences are also found in kidney outcomes, even not fully understood. Our paper analyzes the main differences in different aspects of kidney transplantation related to gender, including nutritional aspects

Salute renale per tutti e ovunque: riflessioni al femminile sul tema centrale della Giornata Mondiale del Rene 2020

The goal of the World Kidney Day 2020 (WKD) is "the promotion of public health by ensuring universal, equitable and sustainable access to care, making access to health for all people and social categories equitable". Chronic Kidney Disease (CKD) is a complex and "demanding" health problem for patients and professionals, particularly in the more advanced stages of the disease. In addition to factors such as the so-called systemic conditions and risk factors, sex-related factors intervene in women, which can further complicate the CKD trend. For these reasons, one of the objectives of the World Kidney Day is that prevention and early treatment are included in the Universal Health Coverage (UHC) and that common strategies are implemented to promote awareness of this pathology. The woman has always played a central role in the "coordination" of family life and "taking care", a role transversal to the different ethnic groups, as evidenced also by the data relating to living kidney donation. This article gives a reflection on some issues related to prevention and treatment of CKD from a female perspective, such as what strategies to identify to implement prevention in the family starting from nutrition, such as the advice for the preparation of a diet plan respectful of the traditions of the country of origin, the identification and treatment of risk factors in order to implement strategies aimed at prevention dedicated to the female world and which style distinguishes the female approach to care | (Gender_nephrology

Telemedicina tra clinica e nutrizione nella Malattia Renale Cronica (MRC): appunti di esperienze al femminile

In Italy, starting from 2015, the date of publication of the guidelines on the 2014-2020 Digital Growth Strategy, technological evolution in medicine has provided encouraging results. The term telemedicine is now in common use, and it is also indicated at an encyclopedic level as "the set of technical and health care monitoring tools, created through systems designed to provide quick access to both medical specialists and patients, regardless of the place where they are respectively located". Nowadays, in the COVID era, the need for social distancing has highlighted the contribution of digital technology to healthcare in terms of access to care and healthcare spending. With regard to chronic kidney disease, telemedicine has always proved essential in improving patients' quality of life, as in the case of peritoneal dialysis. The remote management and monitoring of patients undergoing peritoneal dialysis has not only proved to radically change and improve patients' quality of life in replacement therapy, but has also reduced costs. There are some situations in which telemonitoring can guarantee the maintenance of an adequate quality of life for patients in the different stages of the disease. Thanks to the constant commitment of some groups of professionals where the largest part is represented by the "pink quota", it was possible to experiment and implement evaluation protocols for the renal patient in conservative and replacement treatment in some of the most central aspects of care: medical and dietary therapy

Association between Cognitive Impairment and Malnutrition in Hemodialysis Patients: Two Sides of the Same Coin

Cognitive impairment and malnutrition are prevalent in patients on hemodialysis (HD), and they negatively affect the outcomes of HD patients. Evidence suggests that cognitive impairment and malnutrition may be associated, but clinical studies to assess this association in HD patients are lacking. The aim of this study was to evaluate the association between cognitive impairment evaluated by the Montreal Cognitive Assessment (MoCA) score and nutritional status evaluated by the malnutrition inflammation score (MIS) in HD patients. We enrolled 84 HD patients (44 males and 40 females; age: 75.8 years (63.5–82.7); HD vintage: 46.0 months (22.1–66.9)). The MISs identified 34 patients (40%) as malnourished; the MoCa scores identified 67 patients (80%) with mild cognitive impairment (MCI). Malnourished patients had a higher prevalence of MCI compared to well-nourished patients (85% vs. 70%; p = 0.014). MoCa score and MIS were negatively correlated (rho:−0.317; p < 0.01). Our data showed a high prevalence of MCI and malnutrition in HD patients. Low MoCA scores characterized patients with high MISs, and malnutrition was a risk factor for MCI. In conclusion, it is plausible that MCI and malnutrition are linked by common sociodemographic, clinical, and biochemical risk factors rather than by a pathophysiological mechanism