منابع مشابه
Increased norepinephrine spillover into the jugular veins in essential hypertension.
In essential hypertension sympathetic nerve firing is commonly increased. A central nervous system origin has been presumed but not tested directly. To estimate cerebral norepinephrine release in essential hypertension, spillover of norepinephrine into the cerebrovascular circulation was measured by isotope dilution, with high internal jugular venous sampling. Norepinephrine was released into t...
متن کاملForearm norepinephrine spillover during standing, hyperinsulinemia, and hypoglycemia.
Plasma norepinephrine (NE) concentrations are a fallible index of sympathetic neural activity because circulating NE can be derived from sympathetic nerves, the adrenal medullas, or both and because of regional differences in sympathetic neural activity. We used isotope dilution measurements of systemic and forearm NE spillover rates (SNESO and FNESO, respectively) to study the sympathochromaff...
متن کاملDoes regional norepinephrine spillover represent local sympathetic activity?
Regional spillover of norepinephrine (NE), based on isotope dilution and single-compartment steady-state kinetics, is considered one of the best parameters for estimating organ sympathetic activity. However, the effects of local changes in clearance of NE on the spillover have not yet been investigated. We studied local NE kinetics and clearance in the forearm of 10 healthy subjects using intra...
متن کاملDifferent relationships of spillover to release of norepinephrine in human heart, kidneys, and forearm.
Spillover of norepinephrine (NE) into plasma is used frequently as an index of NE release and therefore of sympathetic nerve activity. An important limitation of NE spillover is that it reflects not only release but also uptake processes that intervene before the transmitter reaches the circulation. To overcome this limitation, we developed a method for estimating NE release based on measuremen...
متن کاملShort-term heart rate variability and cardiac norepinephrine spillover in patients with depression and panic disorder.
Changes in measures of heart rate variability (HRV) have been associated with an increased risk for sudden cardiac death. The mechanisms underlying this association are not known. The objective of this study was to assess the relationship between the amount of norepinephrine (NE) released from the cardiac sympathetic terminals and short-term HRV. The study comprised 8 healthy subjects, 12 patie...
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ژورنال
عنوان ژورنال: Hypertension
سال: 1988
ISSN: 0194-911X,1524-4563
DOI: 10.1161/01.hyp.12.4.468