Abstract
Individuals with systolic dysfunction congestive heart failure may have decreased neuronal density, decreased neuronal function (reuptake or retention of norepinephrine), or a combination of these, plus reduction in postsynaptic β-receptor density. Cardiac neuronal distribution and function can be imaged with standard γ cameras and PET using radiolabeled analogs of norepinephrine. Postsynaptic β-adrenergic receptor distribution and density can be determined using PET. Multiple imaging studies of the presynaptic component have reported that those individuals with the lowest retention or fastest washout of the radiolabeled analogs have a much greater annual mortality than do those with greater retention or slower washout rate. The results of some studies have suggested that the image abnormalities are better predictors of death than are more common predictors of outcome such as ejection fraction, heart rate variability, and microvolt T-wave alternans. The variability between these studies makes it unclear which measure of presynaptic dysfunction is the most predictive. β-Receptor imaging has not been evaluated as extensively as a prognostic tool as has presynaptic imaging. Preliminary data suggest that regional mismatch between β-receptors and presynaptic norepinephrine transporter function may serve as a marker for adverse outcome.
Key Points
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Utilizing radiolabeled norepinephrine analogues, standard γ camera and PET have been used to image norepinephrine uptake/storage by the presynaptic cardiac sympathetic nervous system
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β-Adrenergic receptors can only be imaged with PET
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For many etiologies of systolic congestive heart failure, there is decreased uptake or incomplete retention of norepinephrine by the presynaptic nervous system, which can be identified by evaluating changes in radiotracer activity over time
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Heart failure patients with the poorest retention or more rapid washout of norepinephrine analogue by either imaging modality have a worse survival rate than those with a higher or normal retention/washout
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β-Adrenergic receptor density is not necessarily abnormal in regions of abnormal presynaptic function and heart failure patients, as a group, have much greater regional mismatch between β-receptor density and presynaptic function than do normal subjects
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Preliminary data suggest that heart failure patients with the greatest heterogeneity of mismatch between postsynaptic and presynaptic function have worse outcomes than those with less heterogeneity
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Link, J., Caldwell, J. Diagnostic and prognostic imaging of the cardiac sympathetic nervous system. Nat Rev Cardiol 5 (Suppl 2), S79–S86 (2008). https://doi.org/10.1038/ncpcardio1150
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DOI: https://doi.org/10.1038/ncpcardio1150
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