The grinch probably would have died

Having a big heart might be good in fiction, but in real life it's a real problem. Hypertrophy of the heart is  caused by an inflammation of the ventricle walls. Periods of increased aortic pressure requires pressure in the left ventricle of the heart to increase during cardiac contraction so that blood can be forced into the aorta. Just as skeletal muscle swells during sustained physical activity, the cardiac muscle in the left ventricle will becomes swollen to decrease the amount of contraction needed to create the needed pressure. This lessens the cardiac output overall by lessening the volume capacity of the left ventricle and increasing the overall size of the heart.