The correlation between the noradrenalin (NA), dopamine (DA) and serotonin (5-HT) contents of cerebrospinal fluid (CSF) samples obtained from the cerebro-ventricular space and the systolic and diastolic blood pressure (BP) of two patients with cerebral haemorrhage were investigated. Significant correlation was found between CSF NA, CSF DA level and systolic BP in case I. There was no correlation between CSF catecholamine levels and diastolic BP and between serotonin level and BP. Significant correlation was observed in case II between CSF DA level and diastolic BP. There was no correlation between CSF serotonin level and BP. These results suggest that CSF catecholamines might play some role in the regulation of BP.
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