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[Dopamin-beta-hydroxylaseaktivität im Plasma von Dialysepatienten (author's transl)]
Insights
Plasma dopamine-beta-hydroxylase (DBH) is lower in hemodialysis patients, indicating reduced sympathetic activity. However, DBH levels increase during ultrafiltration, showing an appropriate sympathetic response to volume loss.
Area of Science:
- Biochemistry
- Neuroscience
- Nephrology
Context:
- Dopamine-beta-hydroxylase (DBH) is a key enzyme in catecholamine synthesis.
- Hemodialysis patients often exhibit altered sympathetic nervous system activity.
- Understanding DBH in this population is crucial for managing cardiovascular complications.
Purpose:
- To investigate plasma DBH levels in hemodialysis patients compared to healthy controls.
- To assess the relationship between DBH activity and sympathetic function during hemodialysis.
- To explore the dynamic changes in DBH during the ultrafiltration process.
Summary:
- Plasma DBH levels were significantly lower in 37 hemodialysis patients (32.5 +/- 17.6 IU) compared to 70 healthy controls (50.0 +/- 29.3 IU).
- No significant differences in basal DBH were observed between males and females, nor was there a correlation with age in controls.
- Plasma DBH activity increased during ultrafiltration in hemodialysis patients, suggesting a sympathetic reflex response to volume depletion.
Impact:
- Findings suggest potentially lowered sympathetic activity in hemodialysis patients.
- The observed rise in DBH during ultrafiltration indicates a preserved sympathetic reflex mechanism.
- This research contributes to understanding neuro-autonomic dysfunction in chronic kidney disease.
Abstract:
Plasma dopamin-b-hydroxylase (DBH) was studied in 70 healthy control persons and in 37 hemodialysed patients. Basal DBH in controls corresponded to 50.0 +/- 29.3 IU. There was was no significant difference between males (53.9 +/1 33.8 IU) and females (47.4 +/- 25 IU); no correlation could be found between age and plasma DBH. In hemodialysed patients basal DBH levels were significantly (p less than 0.01) decreased (32.5 %/- 17.6 IU), suggesting lowered sympathetic activity and/or abnormalities in release, distribution space, or metabolism of DBH. During hemodialysis plasma DBH activity rose during ultrafiltration. This finding indicates a directionally appropriate sympathetic reflex response to volume depletion in dialysed patients.