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Protein-Bound Uremic Retention Solutes and Long Nocturnal Hemodialysis: a Longitudinal Analysis

2014-08-27 03:40:53 | BioPortfolio

Summary

Although remarkable progress has been made, chronic kidney disease still poses a major burden on both individual patients, as well as on society as a whole. There is a strong inverse relationship between decreasing renal function, as estimated by glomerular filtration rate, and mortality rate, especially death due to cardiovascular disease. The exact cause(s) remain to be elucidated. Uremic toxins might play an important role.

In the course of decreasing renal function the concentration of numerous intracellular and extracellular compounds vary from the non-uremic state. A still increasing number of uremic retention solutes are being identified. Renal replacement strategies aim to remove potentially harmful substances from the body. Traditionally much attention has been paid to small water-soluble molecules such as urea nitrogen and creatinine. Based on the results of the recent HEMO and ADEMEX studies, increases of small water-soluble solute removal above the level reached with modern dialysis techniques (HD, PD) seem not to be advantageous with regard to patient outcome. These findings may point to the importance of other distinct groups of uremic retention solutes. In view of the data described above, protein-bound solutes might be good candidates.

Several advantages of long duration hemodialysis have been observed, including a better control of blood pressure by decreasing extracellular fluid volume, lowering peripheral vascular resistance and improving endothelium-dependent and -independent vasodilation. A normalization of heart rate variability and improvement of left-ventricular function was noted as well. Furthermore, anemia control has been shown to be easier and several nutritional parameters improved in patients treated with long duration HD. The therapy results in higher small water-soluble solute removal, phosphate removal and greater elimination of larger molecules (e.g. β2-microglobulin).

It seems an appealing question whether a better control of the serum levels of protein-bound solutes can be achieved by long duration (nocturnal) hemodialysis. This might be another advantage of this therapeutic modality, or may even in part explain the better outcome of patients treated this way.

The study compares intermittent hemodialysis with long nocturnal hemodialysis with respect to serum concentrations of several protein bound uremic toxins, as well as solute removal.

Study Design

Observational Model: Cohort, Time Perspective: Prospective

Conditions

End Stage Kidney Disease

Intervention

hemodialysis

Location

Monash Medical Centre
Clayton
Victoria
Australia
3168

Status

Active, not recruiting

Source

Universitaire Ziekenhuizen Leuven

Results (where available)

View Results

Links

Published on BioPortfolio: 2014-08-27T03:40:53-0400

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Medical and Biotech [MESH] Definitions

The end-stage of CHRONIC RENAL INSUFFICIENCY. It is characterized by the severe irreversible kidney damage (as measured by the level of PROTEINURIA) and the reduction in GLOMERULAR FILTRATION RATE to less than 15 ml per min (Kidney Foundation: Kidney Disease Outcome Quality Initiative, 2002). These patients generally require HEMODIALYSIS or KIDNEY TRANSPLANTATION.

Conditions in which the KIDNEYS perform below the normal level for more than three months. Chronic kidney insufficiency is classified by five stages according to the decline in GLOMERULAR FILTRATION RATE and the degree of kidney damage (as measured by the level of PROTEINURIA). The most severe form is the end-stage renal disease (CHRONIC KIDNEY FAILURE). (Kidney Foundation: Kidney Disease Outcome Quality Initiative, 2002)

KIDNEY injuries associated with diabetes mellitus and affecting KIDNEY GLOMERULUS; ARTERIOLES; KIDNEY TUBULES; and the interstitium. Clinical signs include persistent PROTEINURIA, from microalbuminuria progressing to ALBUMINURIA of greater than 300 mg/24 h, leading to reduced GLOMERULAR FILTRATION RATE and END-STAGE RENAL DISEASE.

A severe irreversible decline in the ability of kidneys to remove wastes, concentrate URINE, and maintain ELECTROLYTE BALANCE; BLOOD PRESSURE; and CALCIUM metabolism. Renal failure, either acute (KIDNEY FAILURE, ACUTE) or chronic (KIDNEY FAILURE, CHRONIC), requires HEMODIALYSIS.

Hospital units in which care is provided the hemodialysis patient. This includes hemodialysis centers in hospitals.

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