The tricuspid septal and/or posterior valves occasionally attach to the right ventricular wall near the apex along with the anterior valve inferiorly in about 0.5% to 1.0% of cases of precordial disease. The aortic and pulmonary artery shadows are small, and the heart shadow resembles a balloon. How to check for small aortic and pulmonary artery shadow? 1.Symptoms In mild cases, there are no symptoms, which are found during physical examination. The presence or absence of symptoms and performance are also related to the type of disease and the presence of complications. 2. Diagnostic criteria (1) Pregnancy history of the mother: presence of viral infections, radiation exposure, medication history, history of diabetes, nutritional disorders, environmental and genetic factors in the first 3 months of pregnancy. (2) Common symptoms: shortness of breath, cyanosis, paying particular attention to the age and time of appearance of cyanosis, whether it is related to crying, movement, etc., and whether it is paroxysmal or persistent. Symptoms of heart failure: increased heart rate (up to 180 beats/minute), shortness of breath (50 beats/minute – 100 beats/minute), restlessness, pauses during feeding due to dyspnea and asthma-like attacks, etc. Recurrent or persistent upper respiratory tract infections, pallor, low crying, moaning, hoarseness, etc., also suggest the possibility of congenital heart disease. (3) Development: Children with congenital heart disease are often malnourished, with thin trunk, no weight gain, delayed growth, etc., and may have squatting phenomenon. 3.Physical examination If physical examination reveals typical organic murmur of the heart, low heart sound, enlarged heart, arrhythmia and large liver, further examination should be conducted to exclude congenital heart disease. Laboratory tests (1) Electrocardiogram (ECG or EKG) is a technique that uses an electrocardiogram machine to record from the body surface the changes in electrical activity generated by each cardiac cycle of the heart. (2) Echocardiography is a group of non-invasive examination methods that apply ultrasonic echo to probe the heart and large blood vessels to obtain relevant information. It includes M-mode ultrasound, two-dimensional ultrasound, pulsed Doppler, continuous Doppler, and color Doppler flow imaging.