My Dad, is 72 years old and about 24 years had a heart attack. Since then he has eated extremely healthy, cutting out all fats, most carbs and it's mainly fish and fresh vegetables. He also walks on a treadmill for 45 minutes everyday. He went to his cardioligist because he was experiencing a lot of palpitations, they suggested a difibulatir/pace maker. He had a very slow heart beat so they sped it up and he feels a lot better, except he still had the palpitations. Anyone know what could be causing this?