Regional patterns of myocardial sympathetic denervation in dilated cardiomyopathy: an analysis using carbon-11 hydroxyephedrine and positron emissiontomography
F. Hartmann et al., Regional patterns of myocardial sympathetic denervation in dilated cardiomyopathy: an analysis using carbon-11 hydroxyephedrine and positron emissiontomography, HEART, 81(3), 1999, pp. 262-270
Citations number
49
Categorie Soggetti
Cardiovascular & Respiratory Systems","Cardiovascular & Hematology Research
Objective-To assess presynaptic function of cardiac autonomic innervation i
n patients with advanced congestive heart failure using positron emission t
omography (PET) and the recently developed radiolabelled catecholamine anal
ogue carbon-ii hydroxyephedrine (HED) as a marker for neuronal catecholamin
e uptake function.
Design and patients-29 patients suffering from dilated cardiomyopathy with
moderate to severe heart failure were compared with eight healthy controls.
Perfusion scan was followed by HED dynamic PET imaging of cardiac sympathe
tic innervation. The scintigraphic results were compared with markers of di
sease severity and the degree of sympathetic dysfunction assessed by means
of heart rate variability.
Results-In contrast to nearly normal perfusions, mean (SD) HED retention in
dilated cardiomyopathy patients was abnormal in 64 (32)% of the left ventr
icle. Absolute myocardial HED retention was 10.7 (1.0)%/min in controls v 6
.2 (1.6)%/min in dilated cardiomyopathy patients (p < 0.001). Moreover, sig
nificant regional reduction of HED retention was demonstrated in apical and
inferoapical segments. HED retention was significantly correlated with New
York Heart Association functional class (r = -0.55, p = 0.002) and ejectio
n fraction (r = 0.63, p < 0.001), but not, however, with plasma noradrenali
ne concentrations as well as parameters of heart rate variability.
Conclusions-In this study, using PET in combination with HED in patients wi
th dilated cardiomyopathy, not only global reduction but also regional abno
rmalities of cardiac sympathetic tracer uptake were demonstrated. The degre
e of abnormality was positively correlated to markers of severity of heart
failure. The pathogenetic mechanisms leading to the regional differences of
neuronal damage as well as the prognostic significance of these findings r
emain to be defined.