Dialysate content and risk of sudden cardiac death
Denyse Thornley-Brown1, Manish Saha
1Division of Nephrology, University of Alabama at Birmingham, Birmingham, Alabama, USA.
Insights
Optimizing dialysate electrolyte concentrations in hemodialysis can reduce sudden cardiac deaths (SCDs). Specific potassium and calcium levels, along with bicarbonate targets, are crucial for patient outcomes in end-stage renal disease.
Area of Science:
- Nephrology
- Cardiology
- Clinical Medicine
Background:
- Cardiac complications are a primary cause of mortality in end-stage renal disease (ESRD) patients.
- Sudden cardiac death (SCD) remains a significant concern despite declining overall mortality rates.
Purpose of the Study:
- To identify principles for optimizing dialysate electrolyte concentrations.
- To reduce the incidence of sudden cardiac deaths (SCDs) in hemodialysis patients.
Main Methods:
- Review of existing literature on dialysate composition and SCD risk.
- Analysis of associations between electrolyte levels and mortality.
Main Results:
- A 1.71 ratio of observed to expected SCDs occurs within 12 hours post-hemodialysis.
- Low dialysate potassium (<2 mEq/L), low dialysate calcium (<2.5 mEq/L), and high serum-to-dialysate calcium gradients increase SCD risk.
- Abnormal midweek predialysis serum bicarbonate (<22 or >27 mEq/L) is linked to increased mortality.
Conclusions:
- Dialysate composition significantly impacts SCD risk in hemodialysis patients.
- Further research is needed to identify at-risk patients and develop effective risk-reduction strategies.
Purpose Of Review:
Although the overall mortality rate of patients with end-stage renal disease in the United States continues to decline, cardiac complications remain a leading cause of death in this population. The purpose of this review is to identify principles that can be used to optimize the dialysate concentration of electrolytes in order to reduce the incidence of sudden cardiac deaths (SCDs).
Recent Findings:
The ratio of observed to expected SCD is 1.71 in the 12 h following the onset of a hemodialysis session. A dialysate potassium concentration of less than 2 mEq/l has been associated with an increased risk of SCD as has a dialysate calcium less than 2.5 mEq/l and an elevated serum to dialysate calcium gradient. Midweek predialysis serum bicarbonate concentrations that are less than 22 or more than 27 mEq/l have been associated with increased mortality. An elevated predialysis serum bicarbonate may be a sign of the malnutrition inflammation complex syndrome. Magnesium has not been well studied in hemodialysis patients.
Summary:
Dialysate content plays an important role in the risk of SCD in hemodialysis patients on hemodialysis. There is a need for further studies designed to identify patients at risk and to determine what strategies can be used to lower this risk.
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