Nefrologia最新文献

Background and objective

The progression of chronic kidney disease (CKD) involves the development of alterations in mineral metabolism that are closely related to cardiovascular outcomes and bone disease. Hypomagnesemia is associated with more rapid progression of CKD and other comorbidities. Our objective was to analyze in CKD patients stages 3–4 the impact of the administration of magnesium (Mg) carbonate on bone mineral density (BMD) and hemodynamic changes associated with by vascular calcification (VC).

Material and methods

Patients with CKD stages 3–4 were randomized into controls (n = 12) or intervention (n = 7) group receiving 360 mg of Mg carbonate daily during a 15-month period. Parameters related to mineral metabolism, BMD, VC, and pulse wave velocity (PWV) were evaluated.

Results

Supplementation with Mg produced an increase in the urinary excretion of Mg while serum Mg levels remained stable and no episodes of hypermagnesemia were reported. In addition, no significant changes were found in the degree of VC assessed by Adragao index, however, both serum and urine Mg were significantly associated with a decrease in PWV, suggesting an increase in vascular compliance. Likewise, BMD did not change following treatment, but serum Mg significantly correlated with the levels of N-terminal propeptide of collagen alpha-1(I) chain (PINP), a marker of bone synthesis.

Conclusions

In sum, these results suggest a possible beneficial effect of Mg on vascular compliance with no detrimental effects on bone status. In addition, our results highlight the need to consider monitorization of urinary Mg status in CKD patients.

Introduction

Klotho, a key aging regulator, is predominantly expressed in the kidney. Various methods now enable the measurement of soluble αKlotho blood levels in humans. Limited studies have explored the renal origin of circulating αKlotho in humans.

Methods

Soluble αKlotho in the inferior vena cava blood was measured using an enzyme-linked immunosorbent assay kit using blood samples from patients undergoing adrenal venous catheterization for close examination of primary aldosteronism.

Results

The concentration at the suprarenal inferior vena cava (476 ± 68.2) was significantly higher than that at the infrarenal inferior vena cava (434 ± 74.8) (p = 0.018), with a rate of change of 8.12 (2.3)%.

Conclusions

We demonstrate a step-up in αKlotho concentration from the infrarenal to suprarenal vena cava in humans, supporting the kidney's origin of soluble αKlotho in the bloodstream.

The relationship between diabetes and the development of kidney complications is well known, but the understanding of prediabetes and insulin resistance with impaired kidney function has been scarcely assessed. Various factors could explain this phenomenon, from the lack of standardization in the definitions of prediabetes, to the erratic and inconsistent evidence in large-scale epidemiological and cohort studies. It seems that the pathophysiological pathway of prediabetes could be related to inflammation and neurohormonal hyperactivation, factors present even before the onset of diabetes, which might be the main drivers of glomerular hyperfiltration, albuminuria, and impaired glomerular filtration rate. It is possible that existing treatments for the management of diabetes, as metformin or SGLT2 inhibitors may also be useful in patients with prediabetes with evidence of functional and structural kidney damage. The purpose of this review is to summarize the evidence regarding the relationship between prediabetes (preDM) and the development of CKD.

Background and Purpose

Chronic kidney disease (CKD) is associated with high morbidity, burden, and resource utilization, and represents a major challenge for healthcare systems. The purpose of this study was to analyse the care patterns for these patients and to reach a consensus on the key factors that should be implemented for an optimal care model in CKD, through a multidisciplinary and integrative vision.

Materials and Methods

A multidisciplinary panel of professionals with experience in the field of CKD was formed, composed of an advisory committee of 15 experts and an additional panel of 44 experts. Challenges and areas for improvement across the continuum of care were identified through review of scientific evidence and individual interviews with the advisory committee. Key factors for an optimal model of care in CKD were agreed and assessed using the Rand/UCLA consensus methodology (adapted Delphi), evaluating their appropriateness and necessity.

Results

38 key factors were identified for an optimal CKD patient care model, organised into four challenges: 1) Development of CKD management models and increased visibility of the disease, 2) Prevention, optimisation of screening, early diagnosis and registration of CKD at all levels of care, 3) Comprehensive, multidisciplinary and coordinated monitoring, ensuring therapeutic optimisation and continuity of care, and 4) Reinforcement of CKD training for health care professionals and patients. 35 key factors were assessed by the panel as adequate and clearly necessary, and of these, 14 were considered highly imperative.

Conclusions

There is consensus on the need to prioritise CKD care at both institutional and societal levels, moving towards optimal models of CKD care based on prevention and early detection of the disease, as well as comprehensive and coordinated patient monitoring and training and awareness-raising at all levels. The key factors identified constitute a roadmap that can be implemented in the different Autonomous Communities and contribute to a significant improvement in the patient's care.

Introduction

Intradialytic hypertension (IDH) is a poorly understood phenomenon with no consensus on its definition, etiology, or related factors, and there is limited evidence on its consequences.

Objective

To determine the prevalence of IDH according to different definitions in hemodialysis (HD) units, with different clinical practices and assessment of possible events after 18 months have passed.

Materials and methods

A cross-sectional observational study was conducted in two HD units, including all prevalent patients from March 2021 to September 2022. We established three definitions of IDH: Def 1: Mean arterial pressure (MAP) difference pre- and pos-HD > 15 mmHg. Def 2: Systolic blood pressure (SBP) difference pre- and pos-HD > 10 mmHg. Def 3: SBP difference >0 and ultrafiltration rate (UFR) > 5 ml/kg/h.

IDH was considered present if the criterion was met in more than 50% of the six consecutive sessions (2 weeks) of follow-up. Personal history, medications, dialysis characteristics, and pre- and post-HD biochemical data were collected. Residual renal function (RRF) was considered as urine output >250 ml/24 h. At 18 months, the possible events of the group were analyzed.

Results

We included 169 patients (68% men) with a mean age of 67.9 (14.2) years and a median HD duration of 34.5 (IQR: 17.5-67.5) months. Of these, 94 come from one unit and 75 from the other. The prevalence of IDH was 8.3% according to Def 1, 27.2% according to Def 2, and 29.6% according to Def 3. Def 2 showed an association with a history of previous hypertension, use of renin-angiotensin system inhibitors (RASIs), and furosemide, as well as with patients with RRF. Def 3 showed an association only with coronary artery disease. There was an association with different prescriptions of dialysis fluids. Catecholaminergic hormones and aldosterone did not increase in patients with hypertension during the HD session. They did not present a higher incidence of cardiovascular events or mortality at 18 months.

Conclusions

IDH has different prevalence rates depending on the definition used and the studied center. The future poses an important challenge: to determine which definition correlates with higher morbidity and mortality and the role of differences found in different HD units.