Low ejection fraction, on the other hand, is an ejection fraction that is lower than the normal percentage. This is mainly due to abnormal enlargement of the ventricles and reduced ventricular function. Patients presenting with cardiac insufficiency often have a reduced ejection fraction. The chance of sudden death from malignant arrhythmias increases significantly when the ejection fraction drops below 35%. What are the main symptoms that cause a low ejection fraction? Abnormal ventricular enlargement: Ventricular enlargement is mainly seen in patients with pulmonary hypertension. Common causes include chronic pulmonary heart disease, hypertrophic cardiomyopathy, etc. Ventricular hypofunction: ventricular hypofunction can cause insufficient blood pump to affect the body’s metabolism thus causing a series of syndromes based on circulatory disorders. There are many causes such as chronic cardiac insufficiency (chronic heart failure); coronary artery disease, hypertension-induced cardiac overload; myocardial ischemia, hypertrophic heart disease, pericardial disease, etc. Also diabetes can cause this condition. Pulmonary artery segment lengthening: lung texture thickening and increase means that the airway bronchial blockage caused by a variety of reasons is often bronchitis patients with bronchial asthma will also be so other material stimulation will also appear bronchospasm long-term bronchial constriction will cause lung texture thickening, increase these substances can be airborne dust can also be car exhaust can also be second-hand smoke if there is a history of allergies to If you have a history of allergies, you may be allergic to substances such as dog or cat hair, pollen, or cold air, which can cause bronchospasm. Enlarged transverse cardiac diameter: Enlarged transverse cardiac diameter includes the general term for various pathological types of arterial wall degeneration and sclerosis. Atherosclerosis is a non-inflammatory degenerative and proliferative rubbing of the arteries that leads to thickening and hardening of the arterial walls and narrowing of the lumen and loss of arterial elasticity. Three common types of atherosclerosis are atherosclerosis, arterial calcification and small artery sclerosis. Cerebral arteriosclerosis refers to non-acute diffuse brain tissue changes and neurological dysfunction caused by atherosclerosis of the cerebral arteries, such as small arteriosclerosis and vitreous degeneration of the arterial wall. Clinical manifestations are progressive brain hypofunction early neurasthenia syndrome and then gradually appear diffuse organic brain damage such as vascular dementia Parkinson’s syndrome pseudobulbar palsy subcortical arteriosclerotic encephalopathy and cerebral nerve palsy. All of these symptoms can lead to low ejection fraction.