When the EP was doing my 4th ablation he discovered evidence of pulmonary hypertension in the left ventricle. I have just seen the 'lung' consultant and have to have tests to find out why as I have never smoked. He said that if untreated it can cause AF and thickening of the heart walls, so maybe it was the root cause of my AF and heart failure. Of course researching on the Internet has worried me considerably. Does anyone have any knowledge on pulmonary hypertension? Thank you.