What could cause an electrical jolt type pain that seems to start at the heart and project to the left upper corner of the shoulder blade - comes about every 30-45 minutes. Not affected by movement. Not overweight. Go to the gym 3 times a week. Take 25 mg atenolol 1-qam; Ranexa morning and night, amblopine besylate 5 mg 2-qam no burning or crushing pain in chest no nausea, no problem breathing, no sweating