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Haem derivatives in subdural haematomas.

N G Wahlgren¹, C Lindquist

¹Department of Neurology, Karolinska Institute, Stockholm, Sweden.

Acta Neurochirurgica

|January 1, 1988

Summary

Subdural hematomas contain high concentrations of bilirubin and oxyhemoglobin. As bilirubin processing capacity is exceeded, oxyhemoglobin converts to methemoglobin, potentially causing oxidative stress and cerebral vasospasm.

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Area of Science:

Neuroscience
Biochemistry
Pathophysiology

Background:

Subdural hematomas involve blood breakdown products.
The role of these products in neurological complications is not fully understood.

Purpose of the Study:

To quantify haem derivatives (oxyhaemoglobin, methaemoglobin, bilirubin) in subdural hematomas and cerebrospinal fluid.
To investigate the relationship between these derivatives and potential pathophysiological processes.

Main Methods:

Analysis of oxyhaemoglobin, methaemoglobin, and bilirubin concentrations.
Measurement in subdural hematomas and cerebrospinal fluid samples from 18 patients.

Main Results:

Haem derivative concentrations varied significantly between hematomas (55 µmol/l to 13.9 mmol/l) and cerebrospinal fluid (0.1 µmol/l to 8.2 µmol/l).
Bilirubin dominated in hematomas <1 mmol/l; higher concentrations suggested bilirubin processing saturation.
Increased oxyhaemoglobin to methaemoglobin conversion, releasing superoxide radicals, was observed in hematomas exceeding 1 mmol/l.

Conclusions:

High haem derivative concentrations in subdural hematomas may indicate overwhelmed bilirubin metabolism.
The conversion of oxyhaemoglobin to methaemoglobin releases superoxide radicals, potentially contributing to conditions like cerebral vasospasm.

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