High correlation between salivary MHPG and CSF MHPG
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Rationale. Determination of 3-methoxy-4-hydroxy-phenylglycol (MHPG) as a major metabolite of noradrenaline may reflect changes in noradrenergic activity dependent on psychiatric illness and drug therapy.
Objective. This study was designed to investigate the relationship between CSF and salivary MHPG, and thus the utility of saliva MHPG as a marker for CSF MHPG.
Method. Twenty-one paired samples of saliva and CSF were assayed for MHPG by solid-phase extraction and HPLC-ED.
Result. Salivary MHPG was highly positively correlated with CSF MHPG (P<0.001).
Conclusion. This finding supports the use of salivary MHPG as an index for CSF MHPG, and enhances the usefulness of salivary MHPG measurements as a non-invasive approach for clinical studies investigating noradrenergic systems.
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