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Catecholamine metabolites in spinal cord injury
Archives of Physical Medicine and Rehabilitation
|September 1, 1982
Summary
Spinal cord injury (SCI) patients do not show elevated urinary norepinephrine metabolites. However, specific injury types reveal decreased 3-methoxy-4-hydroxyphenylethylglycol (MHPG), suggesting reduced norepinephrine activity in the damaged spinal cord (SC).
Area of Science:
- Neuroscience
- Biochemistry
- Physiology
Background:
- Previous studies suggested elevated urinary norepinephrine metabolites in spinal cord injury (SCI).
- These findings were interpreted as increased peripheral norepinephrine activity post-SCI.
- The influence of affective disorders on catecholamine metabolism in SCI requires further investigation.
Purpose of the Study:
- To investigate catecholamine metabolism in patients with spinal cord injury (SCI).
- To test the hypothesis of sustained peripheral norepinephrine activity in SCI.
- To control for the impact of affective disorders on catecholamine metabolism.
Main Methods:
- Collected urinary samples from 30 patients with SCI.
- Measured levels of 3-methoxy-4-hydroxyphenylethylglycol (MHPG) and vanillylmandelic acid (VMA).
- Analyzed MHPG and VMA levels and their ratio (VMA:MHPG) in relation to SCI severity and type.
Main Results:
- Overall urinary MHPG and VMA levels were not significantly elevated in the total SCI sample.
- Patients with spastic quadriplegia exhibited lower-than-normal urinary MHPG levels.
- A higher VMA:MHPG ratio was observed in complete and spastic quadriplegia, primarily due to decreased MHPG.
Conclusions:
- The study challenges the notion of universally elevated norepinephrine activity in SCI.
- Decreased MHPG in specific SCI types suggests reduced norepinephrine turnover in the damaged spinal cord (SC).
- The VMA:MHPG ratio appears to be a more sensitive indicator of norepinephrine activity in SCI.