(Circulation. 1999;100:135-140.)
© 1999 American Heart Association, Inc.
Clinical Investigation and Reports |
Cardiac Sympathetic Denervation After Transmyocardial Laser Revascularization
From the Krannert Institute of Cardiology, Indiana University, and St Vincent Hospital (K.B.A., D.A.H.), Indianapolis, Ind.
Correspondence to Erica D. Engelstein, MD, Assistant Professor of Medicine, Krannert Institute of Cardiology, Indiana University, 1111 W 10th St, Indianapolis, IN 46202-4800. E-mail eengelst{at}iupui.edu
Background—Transmyocardial laser revascularization (TMR) has been shown to improve refractory angina not amenable to conventional coronary interventions. However, the mechanism of action remains controversial, because improved myocardial perfusion has not been consistently demonstrated. We hypothesized that TMR relieves angina by causing myocardial sympathetic denervation.
Methods and Results—PET imaging of resting and stress myocardial perfusion with [13N]ammonia (NH3) and of sympathetic innervation with [11C]hydroxyephedrine (HED) was performed before and after TMR in 8 patients with class IV angina ineligible for CABG or PTCA. A mean of 50±11 channels were created in the left ventricle (LV) with a holmium:YAG laser. A semiautomated program was used to determine NH3 uptake and HED retention in the LV. Perfusion and innervation defects were defined as the percentage of LV with tracer uptake or retention >2 SD below normal mean values. All patients experienced improvement in their angina by 2.4±0.5 angina classes after surgery, P=0.008. Sympathetic innervation defects exceeded resting perfusion defects in all patients before TMR (34.6±27.3% for HED versus 9.4±10.8% for NH3, P=0.008). TMR did not significantly affect resting or stress myocardial perfusion but increased the extent of sympathetic denervation in 6 of 8 patients by 27.5±15.9%, P=0.03. In the remaining 2 patients, both sympathetic denervation and stress perfusion defects decreased after surgery.
Conclusions—TMR causes decreased myocardial HED uptake in most patients without significant change in resting or stress myocardial perfusion, suggesting that the improvement in angina may be at least in part due to sympathetic denervation.
Key Words: angina • lasers • revascularization • nervous system, autonomic
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