Evidence for pre- to postsynaptic mismatch of the cardiac sympathetic nervous system in ischemic congestive heart failure

Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
James H CaldwellJohn R Stratton

Abstract

Pre- and postsynaptic cardiac sympathetic function is altered in ischemic congestive heart failure (CHF). Whether there is a presynaptic-to-postsynaptic mismatch or whether mismatch is related to adverse cardiac events is unknown. In 13 patients with ischemic CHF and 25 aged-matched healthy volunteers, presynaptic function was measured by PET of (11)C-meta-hydroxyephedrine ((11)C-mHED), a norepinephrine (NE) analog. Postsynaptic function, beta-adrenergic receptor (BAR) density (B'(max)), was measured by imaging (11)C-CGP12177. Myocardial blood flow (MBF) was measured by imaging (15)O-water. Each heart was analyzed both globally and regionally, excluding infarcted regions, and a mismatch score, defined as the ratio of B'(max) to NE uptake (PS(nt))(,) was used to indicate mismatch of post- and presynaptic function. Global and regional MBF was not different between CHF and healthy subjects. The global measure of PS(nt) was lower in CHF (0.32 +/- 0.34) than that in healthy subjects (0.81 +/- 0.33, P < 0.0001) and in all 12 regions. Global B'(max) tended to be lower in CHF than that in healthy subjects (10.0 +/- 6.4 pmol/mL vs. 13.4 +/- 4.2, P = 0.056) and in all 12 regions. The global mismatch score (B'(max):PS(nt)) in CHF patients...Continue Reading

Associated Clinical Trials

Apr 9, 2015·Maria Helena Santa-Clara Pombo RodriguesMaria Helena Santa-Clara Pombo Rodrigues

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