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Is timing of haemorrhage by spectrophotometry similar for haemorrhages in the subdural and subarachnoid space?
  1. K Kamath Tallur,
  2. N R Belton,
  3. R Stephen,
  4. R A Minns
  1. University of Edinburgh, UK
  1. Correspondence to:
    Dr R A Minns
    Child Life and Health, University of Edinburgh, 20 Sylvan Place, Edinburgh EH9 1UW, UK;

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We investigated whether quantifying the spectral peaks for oxyhaemoglobin, methaemoglobin, and bilirubin (and their ratios) and comparing them to established standards for timing subarachnoid haemorrhage, might permit timing of the subdural haemorrhage.

When red cells enter the subarachnoid space, they are visible for a few days to several weeks.1 Lysis of red cells results in oxyhaemoglobin release predominantly between 2 and 12 hours but continues up to 48 hours. A microsomal enzyme haeme oxygenase, released from …

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