The dangers of hypodiastolic left heart function include myocardial ischemia, stagnation of the pulmonary circulation, and obstruction of the return of blood to the heart from the body circulation. 1. Myocardial ischemia: the blood supply of the heart depends on the blood flow of the coronary arteries, which have a high blood flow during diastole and a low blood flow during contraction. Therefore, the blood supply of the heart muscle is in the diastolic phase of the heart beat, and the reduced diastolic function of the left heart will affect the blood flow of the coronary arteries, so that the heart muscle suffers from ischemia and hypoxia. 2. Stagnant blood in the pulmonary circulation: the left atrium receives oxygenated blood from the pulmonary circulation. When the diastolic function of the left heart is reduced, the blood from the pulmonary circulation cannot be pumped into the left atrium smoothly, resulting in stagnation of the blood in the pulmonary circulation, which may cause symptoms such as panic attacks, shortness of breath, and dyspnea. 3. Obstruction of the return of blood from the circulation to the heart: Decreased diastolic function of the left heart will cause an increase in the resistance of the right ventricle to ejection of blood into the pulmonary artery, which will increase the pressure of the right atrium over time, affecting the return of blood from the whole body to the heart. It is recommended to consult a doctor if you feel unwell to avoid any delay in your condition.