The first heart sound occurs at the beginning of cardiac systole and is low in pitch and long in duration (about 0.15 seconds). The causes include the contraction of the ventricular muscle, the sudden closure of the atrioventricular valve and the subsequent ejection of blood into the aorta, among other vibrations. The best place to hear the first heart sound is at the fifth intercostal space in the midclavicular line or at the right border of the sternum. Dietary therapy for apical 1st heart sound hyperactivity: 1. Coix kelp egg soup kelp, coix kernel, egg, cooking oil, monosodium glutamate, salt and pepper in appropriate amounts. Wash the kelp and cut strips, wash the coix seeds, put them in a pressure cooker, add water to stew the kelp and coix seeds until extremely rotten. Iron pot on a high fire, add cooking oil, scramble the eggs well, immediately pour the kelp, coix seeds with soup, add salt, pepper, stew for a few moments. Eat with meals, the effect of strong heart diuretic. 2, two birds soup hen, white pigeon, large winter melon, red ginseng, sunflower flesh, Yuan Zhi, Zhu Sha, fried jujube seeds, Yu Zhu. Hen, white pigeon slaughtered to remove the hair, remove the intestines, gall bladder, leaving five organs; winter melon cut from the top to dig out the flesh.