Targeting Sodium in Heart Failure
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Filippos Triposkiadis1, Andrew Xanthopoulos2, John Skoularigis2
1School of Medicine, European University Cyprus, 2404 Nicosia, Cyprus.
Insights
Heart failure (HF) management requires balancing sodium (Na+) and water. New methods like 23Na+ MRI and wearable sensors may improve monitoring of Na+ levels and congestion in HF patients.
Area of Science:
- Cardiology
- Nephrology
- Biomedical Engineering
Background:
- Heart failure (HF) is significantly impacted by disruptions in sodium (Na+) and water balance, leading to fluid retention and edema.
- Incomplete decongestion in HF patients correlates with poorer outcomes, highlighting the need for effective Na+-targeting interventions.
- Current HF management often involves quadruple therapy, but optimizing Na+-targeting treatments remains a challenge.
Purpose of the Study:
- To evaluate the role and effectiveness of Na+-targeting interventions in managing congestion in heart failure patients.
- To explore advanced methods for monitoring tissue sodium (Na+) and guiding Na+-targeting treatments in HF.
- To investigate the clinical significance of the 3-compartment model of Na+ storage in HF.
Main Methods:
- Review of existing literature on Na+-targeting interventions (dietary restriction, hypertonic saline, diuretics) in HF.
- Discussion of novel monitoring techniques including spot urinary sodium, 23Na+ magnetic resonance imaging (MRI), and wearable sensors.
- Exploration of the 3-compartment model of Na+ storage, emphasizing non-osmotic accumulation in tissues like skin.
Main Results:
- Incomplete decongestion adversely affects HF outcomes, underscoring the importance of effective Na+ and water balance management.
- Existing metrics for HF severity have limitations in predicting and managing congestion, potentially leading to dysnatremias.
- Emerging evidence suggests spot urinary sodium can guide Na+-targeting interventions in both acute and chronic HF.
- 23Na+-MRI and wearable sensors offer promising avenues for accurate tissue Na+ quantification and monitoring.
Conclusions:
- Optimizing Na+-targeting interventions is crucial for selected HF patients on quadruple therapy.
- Advanced monitoring tools like 23Na+-MRI and wearable sensors are essential for precise tissue Na+ assessment and guiding treatment.
- Further research is needed to elucidate the clinical implications of tissue Na+ storage and its role in HF morbidity and mortality.
Abstract:
A dominant event determining the course of heart failure (HF) includes the disruption of the delicate sodium (Na+) and water balance leading to (Na+) and water retention and edema formation. Although incomplete decongestion adversely affects outcomes, it is unknown whether interventions directly targeting (Na+), such as strict dietary (Na+) restriction, intravenous hypertonic saline, and diuretics, reverse this effect. As a result, it is imperative to implement (Na+)-targeting interventions in selected HF patients with established congestion on top of quadruple therapy with angiotensin receptor neprilysin inhibitor, β-adrenergic receptor blocker, mineralocorticoid receptor antagonist, and sodium glucose cotransporter 2 inhibitor, which dramatically improves outcomes. The limited effectiveness of (Na+)-targeting treatments may be partly due to the fact that the current metrics of HF severity have a limited capacity of foreseeing and averting episodes of congestion and guiding (Na+)-targeting treatments, which often leads to dysnatremias, adversely affecting outcomes. Recent evidence suggests that spot urinary sodium measurements may be used as a guide to monitor (Na+)-targeting interventions both in chronic and acute HF. Further, the classical (2)-compartment model of (Na+) storage has been displaced by the (3)-compartment model emphasizing the non-osmotic accumulation of (Na+), chiefly in the skin. 23(Na+) magnetic resonance imaging (MRI) enables the accurate and reliable quantification of tissue (Na+). Another promising approach enabling tissue (Na+) monitoring is based on wearable devices employing ion-selective electrodes for electrolyte detection, including (Na+) and (Cl-). Undoubtably, further studies using 23(Na+)-MRI technology and wearable sensors are required to learn more about the clinical significance of tissue (Na+) storage and (Na+)-related mechanisms of morbidity and mortality in HF.
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