Test Findings
 

Hypokalaemia

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Overview

  • Hypokalaemia is a reduction in the serum potassium concentration, which can predispose to cardiac complications.
    • Look For

    • Serum potassium <3.5mmol/L.

Aetiology

    • Causes of Hypokalaemia

    • Inadequate intake
    • GI loss - vomiting, high NG output, diarrhoea, fistula, laxative abuse
    • Renal loss - Conns, Cushings, ectopic ACTH, loop diuretics, osmotic diuresis, corticosteroids, hypomagnesaemia, RTA
    • Compartmental shift - alkalaemia, insulin, refeeding, beta agonists

Clinical Features

    • Signs and Symptoms

    • Weakness
    • Hypotonicity
    • Depression
    • Constipation
    • Ileus
    • ECG Changes

    • Increased PR interval
    • ST depression
    • Prominent U wave
    • T wave inversion
    • Clinical Features
       
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