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Exercise associated hyponatraemia: quantitative analysis to understand the aetiology
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    Osmotically inactive sodium may also play a quantitative role in exercise-associated hyponatraemia

    Dear Editor,

    Montain et al.(1) use a simplified version of the Nguyen-Kurtz equation to predict a new plasma sodium concentration. This equation accounts for the three principle determinants of change in plasma sodium concentration, namely the mass balances of water, sodium and potassium. However, the y-intercept in the original Edelman equation, appearing here as 23.9 mEq/liter, is assumed in the simplified Ng...

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    Conflict of Interest:
    None declared.