Sympathetic nerve activity in the spasm-induced coronary artery region is associated with disease activity of vasospastic angina.
OBJECTIVE
We assessed the relation between sympathetic nerve activity and disease activity of vasospastic angina.


BACKGROUND
The autonomic nervous system has been proposed to play a key role in attacks of vasospastic angina. A unique feature of vasospastic angina attacks is periodic fluctuation, which complicates the assessment of disease activity.


METHODS
Twenty-five patients with left anterior descending coronary artery (LAD) spasm were studied: 12 with recent onset of chest pain (group 1) and 13 free of angina for more than 3 months after discontinuing medication (group 2). Group 1 underwent iodine-123 metaiodobenzylguanidine (MIBG) imaging (in the active phase) and atropine-stress MIBG imaging early after diagnostic angiography, and repeat MIBG imaging when they were free of angina for more than 3 months with medication (in the stable phase). Group 2 also underwent MIBG imaging (in remission). On a bull's-eye map, quantitative analysis of percent uptake and washout rate of MIBG was performed regionally.


RESULTS
In group 1 in the active phase, the washout rate of the LAD territory was significantly lower than the rates in the stable phase, in remission and during atropine-stress MIBG imaging. The regional washout rate of the territories of the right coronary artery and the circumflex artery in the active phase was also significantly lower than that during atropine-stress MIBG imaging. The washout rate of the LAD territory in the active phase was significantly lower than the rates of the other two regions. In contrast, there were no significant differences in the distribution of regional percent uptake in every image. A similar distribution of washout rate was observed among group 1 patients in the stable phase, in group 1 patients during atropine-stress MIBG imaging and in group 2 patients.


CONCLUSIONS
The MIBG washout rate of the spasm-induced coronary artery territory changed according to the degree of disease activity. Thus, sympathetic nerve activity could reflect disease activity of vasospastic angina.
Sakata
K
K
Department of Cardiology, Shizuoka General Hospital, Japan.
Yoshida
H
H
Hoshino
T
T
Kurata
C
C
D019797:3-Iodobenzylguanidine; D001285:Atropine; D016022:Case-Control Studies; D003329:Coronary Vasospasm / Q000000981:diagnostic imaging / Q000503:physiopathology*; D005260:Female; D006321:Heart / Q000000981:diagnostic imaging*; D006801:Humans; D007457:Iodine Radioisotopes; D007462:Iodobenzenes; D008297:Male; D008875:Middle Aged; D011877:Radionuclide Imaging; D013564:Sympathetic Nervous System / Q000503:physiopathology*
D007457:Iodine Radioisotopes; D007462:Iodobenzenes; D019797:3-Iodobenzylguanidine; D001285:Atropine