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Hyponatremia Predicts New-Onset Cardiovascular Events in Peritoneal Dialysis Patients
Hyung Woo Kim1, Geun Woo Ryu1, Cheol Ho Park1
1Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea.
Insights
Low serum sodium (hyponatremia) is linked to increased cardiovascular events in peritoneal dialysis (PD) patients. Managing hyponatremia may reduce the risk of cardiovascular disease in this population.
Area of Science:
- Nephrology
- Cardiology
- Internal Medicine
Background:
- Cardiovascular disease is the primary cause of death in peritoneal dialysis (PD) patients.
- Hyponatremia, a condition of low serum sodium, is a known mortality predictor in PD patients.
- The specific impact of hyponatremia on cardiovascular outcomes in PD patients requires further investigation.
Purpose of the Study:
- To investigate the association between serum sodium levels and the incidence of cardiovascular events in patients initiating PD.
- To determine if hyponatremia predicts the development of new cardiovascular disease in PD patients.
Main Methods:
- A prospective observational study included 441 incident PD patients.
- Time-averaged serum sodium (TA-Na) levels were calculated for each patient.
- Patients were monitored for new cardiovascular events over a mean follow-up of 43.2 months.
Main Results:
- A total of 106 (24.0%) patients experienced new cardiovascular events during follow-up.
- Higher incidence of cardiovascular events was observed in patients with TA-Na levels ≤ 138 mEq/L compared to those with TA-Na > 138 mEq/L.
- Increased TA-Na levels were associated with a reduced risk of cardiovascular events (SHR 0.90 per 1 mEq/L increase, p=0.003). Patients with TA-Na ≤ 138 mEq/L had a 2.31-fold higher risk of CV events.
Conclusions:
- This study demonstrates a significant association between low serum sodium and new-onset cardiovascular events in PD patients.
- The findings suggest that hyponatremia is a risk factor for cardiovascular disease development post-PD initiation.
- Further interventional studies are needed to determine if correcting hyponatremia can prevent cardiovascular events in PD patients.
Background And Aim:
Cardiovascular (CV) disease is the leading cause of morbidity and mortality in patients on peritoneal dialysis (PD). Hyponatremia was recently shown to be a modifiable factor that is strongly associated with increased mortality in PD patients. However, the clinical impact of hyponatremia on CV outcomes in these patients is unclear.
Methods:
To determine whether a low serum sodium level predicts the development of CV disease, we carried out a prospective observational study of 441 incident patients who started PD between January 2000 and December 2005. Time-averaged serum sodium (TA-Na) levels were determined to investigate the ability of hyponatremia to predict newly developed CV events in these patients.
Results:
During a mean follow-up of 43.2 months, 106 (24.0%) patients developed new CV events. The cumulative incidence of new-onset CV events after the initiation of PD was significantly higher in patients with TA-Na levels ≤ 138 mEq/L than in those with a TA-Na > 138 mEq/L. After adjustment for multiple potentially confounding covariates, an increase in TA-Na level was found to be associated with a significantly lower risk of CV events (subdistribution hazard ratio per 1 mEq/L increase, 0.90; 95% confidence interval, 0.83-0.96; p = 0.003). Patients with a TA-Na ≤ 138 mEq/L had a 2.31-fold higher risk of suffering a CV event.
Conclusions:
These results provide evidence of a clear association between low serum sodium and new-onset CV events after dialysis initiation in PD patients. Whether the correction of hyponatremia for this indication provides additional protection for the development of CV disease in these patients remains to be addressed in interventional studies.
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