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Clinical features

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

There are two phases to the presentation of obstructive anuria.

The "period of tolerance" is characterised by:

  • little or no urine production
  • any urine will be:
    • low specific gravity
    • low in urea
    • low in protein (unless haematuria or urinary infection are present)
    • pyuric
  • aching in one or both loins
  • normal apetite and mental state

After 7-10 days the "period of intoxication" arrives. The following symptoms and signs indicate the onset of uraemia:

  • drowsiness
  • dry tongue
  • hypothermia
  • anorexia
  • constricted pupils

The terminal features of twitching and uraemic convulsions may appear as long as three weeks after the onset of anuria.

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