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- W2024071300 abstract "1 Increase in myocardial sympathetic activity contributes markedly to the pathophysiology of conditions such as congestive heart failure and is also associated with myocardial infarction. However, measurement of myocardial sympathetic activity in vivo is difficult. 2 The present study assesses the effectiveness of metaiodobenzylguanidine (MIBG) imaging to characterize modulation of sympathetic activity, as induced by dexmedetomidine, a highly specific α-2 adrenoceptor agonist. 3 We imaged washout of [125I]-MIBG from rabbit heart before and during two consecutive 45-min intravenous infusions of dexmedetomidine (10 μg kg–1 followed by 16 μg kg−1) (n=9) or of saline (n=9). 4 Heart rate (HR), and mean blood pressure (BP) were measured before and at the end of each study period. Plasma noradrenaline (NA) was measured before and after study drug infusion. The hearts were then excised and biopsied for MIBG tissue concentration [MIBG] (%kg-dose g−1). 5 Relative to saline controls, dexmedetomidine significantly decreased HR, BP, plasma NA and MIBG washout. There was an inverse correlation between MIBG washout and residual [MIBG] in the myocardium (r=−0.75, P < 0.01). 6 These data suggest that a reduction of sympathetic nervous system activity causes a decrease in myocardial MIBG washout in vivo in rabbits, and confirms the usefulness of MIBG scintigraphy as a non-invasive tool to measure changes in myocardial sympathetic activity." @default.
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- W2024071300 date "2001-06-19" @default.
- W2024071300 modified "2023-09-25" @default.
- W2024071300 title "Effects of reduced sympathetic activity on myocardial metaiodobenzylguanidine (MIBG) washout" @default.
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- W2024071300 doi "https://doi.org/10.1046/j.1365-2680.2001.00221.x" @default.
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