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Module 1 : Physiology

 

 

In Health

 

The average daily electrolyte loss (and therefore requirement) is:

  Sodium 1-2mmol/kg/day 

  Potassium 1mmol/kg/day

 

Therefore, for a 70 kg male the average daily requirements in health are:

  Sodium ~ 70-140 mmol/day

  Potassium ~ 70 mmol/day

The figures quoted above are a rough guideline only. Sodium and potassium excretion will vary considerably with intake. In addition, sodium excess may be a major contributor to hypertension, so this is something to bear in mind especially in this risk group.

 

  Test Yourself !  
   
  What is the normal plasma concentration of potassium?

That's correct, well done!
 

3.5 - 5.0 mmol/L - Correct!

 

<3.5 or >5.0 mmol/L - no, below 3.5 is hypokalaemia, and above 5.0 is hyperkalaemia. Both can cause dangerous cardiac arrhythmias, which may be fatal if left untreated! Plasma concentrations of >6.5 mmol/L is a medical emergency and requires urgent intervention.

 

Sorry, that's incorrect!
 

3.5 - 5.0 mmol/L - Correct!

 

<3.5 or >5.0 mmol/L - no, below 3.5 is hypokalaemia, and above 5.0 is hyperkalaemia. Both can cause dangerous cardiac arrhythmias, which may be fatal if left untreated! Plasma concentrations of >6.5 mmol/L is a medical emergency and requires urgent intervention.

 

 

 

 

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