question: Hi I am a 50 year old white male. In trying to find out why I cough and laugh and black out, I have had ECG’s come back always saying different things. Starting with possible left artiral enlargement, left axis deviation, sinus Tachycardia, QT shortened, early R/S transition. Left axis deviation with mild right ventricular delay, left anterior Fascicular Block, left branch bundle block. In 2009 a loop recorder detected asystole which warned a pacemaker, 2012 a esphogeol echocardiogram detected a PFO which was closed. A heart cath in 2012 detected left coronary arterial spasm. Current pace maker shows super ventricular tachycardia. A recent ECG showed left ventricular output reduced to 20-25% from 55-60% in December however a MUGA scan showed out put at 55% after being on cardeilol 3.125 mg 1 2X daily. New biotronic CLS pacemaker implanted in June 2017 SHOWS pacing about 35% of the time. While my electrophysiologist says there is nothing to worry about I was wondering why there is so many different results with the ECG and is there something to worry about such as Congestive heart failure or something?