Unilateral Stellate Block.Introduction:Left sided stellate ganglion predominance has been proposed as a mechanism responsible for lethal ventricular arrhythmias, due to hetaerae nouns ventricular repolarization. To determine the cardiovascular effects of such asymmetric sympathetic ganglion innervations in man, studies were performed in 15 patients undergoing unilateral stellate ganglion blockade for the management of chronic arm pain.Methods and Results:Standard 12‐lead ECGs, systemic blood pressure, body surface potential mapping, and radionuclide angiography were performed during rest and graded exercise before and after blockade. Successful unilateral blockade was accomplished in 13 of the patients, 11 of whom had right‐sided blockade and two left‐sided blockade. No significant changes due to blockade of stellate ganglia, including QT intervals, were detected during rest or graded exercise in standard ECGs. No cardiac rhythm disturbances occurred in these states, Body surface potential maps and arterial blood pressure were similar during resting supine and upright positions, as well as immediately after exercise before and after blockade. Unilateral ganglion blockade did not modify resting or exercise cardiac ejection fractions.Conclusion:Unilateral stellate blockade in man does not induce untoward cardiovascular effects during rest or exe