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The differential diagnosis of hypernatraemia in children, with ...

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<strong>The</strong> Diagnosis <strong>of</strong> Salt Poison<strong>in</strong>g Lead<strong>in</strong>g to Hypematraemia <strong>in</strong> Children – September 2009<br />

CONTENTS<br />

Guidel<strong>in</strong>e Development Group members................................ 1<br />

Summary <strong>of</strong> guidance...............................................................3<br />

1. Introduction................................................................... 11<br />

2. Methodology..................................................................14<br />

3. Incidence <strong>of</strong> <strong>hypernatraemia</strong>....................................... 23<br />

3.1 Incidence <strong>of</strong> <strong>hypernatraemia</strong> <strong>in</strong> <strong>children</strong> <strong>in</strong> the UK.................. 23<br />

3.2 Incidence <strong>of</strong> <strong>hypernatraemia</strong> secondary to child abuse<br />

<strong>in</strong> the UK.................................................................................. 25<br />

3.3 Probability <strong>of</strong> a child present<strong>in</strong>g <strong>with</strong> <strong>hypernatraemia</strong> be<strong>in</strong>g<br />

the subject <strong>of</strong> non-accidental salt poison<strong>in</strong>g............................ 25<br />

4. Causes <strong>of</strong> <strong>hypernatraemia</strong>........................................... 26<br />

4.1 Causes <strong>of</strong> <strong>hypernatraemia</strong> <strong>in</strong> <strong>children</strong> (and adults) other<br />

than excessive sodium <strong>in</strong>take.................................................. 26<br />

4.2 Mechanisms caus<strong>in</strong>g <strong>hypernatraemia</strong> through accidental<br />

excessive sodium <strong>in</strong>take.......................................................... 33<br />

4.3 Characteristics <strong>of</strong> <strong>children</strong> <strong>with</strong> <strong>hypernatraemia</strong> <strong>in</strong> whom<br />

accident was the likely cause.................................................. 51<br />

4.4 Mechanisms caus<strong>in</strong>g <strong>hypernatraemia</strong> through<br />

non-accidental excessive sodium <strong>in</strong>take................................. 53<br />

4.5 Characteristics <strong>of</strong> <strong>children</strong> <strong>with</strong> <strong>hypernatraemia</strong> considered<br />

to have been abused............................................................... 67<br />

4.6 Additional causes <strong>of</strong> <strong>hypernatraemia</strong> <strong>in</strong> adults........................ 69<br />

4.7 Excessive sodium adm<strong>in</strong>istration <strong>with</strong>out <strong>hypernatraemia</strong>...... 71<br />

5. Lethal dose <strong>of</strong> salt.........................................................72<br />

5.1 What is thought to be a lethal dose <strong>of</strong> salt?............................. 72<br />

5.2 How is the dose <strong>of</strong> sodium required to raise the serum<br />

sodium by a specified amount calculated?.............................. 72<br />

5.3 How well known among the public is the lethal dose <strong>of</strong> salt?.. 74<br />

iv

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