Enhanced second heart sounds are common in hypertension or ventricular septal ischemia, etc. The first and second heart sounds can often be heard during normal auscultation. The first heart sound is lower in dullness and longer in duration, marking the onset of systole. The second heart sound is higher in pitch and shorter in duration and marks the beginning of the diastolic phase of the heart. The second heart sound is a sound produced by the closure of the semilunar valves of the aortic and pulmonary valves and the reduction of the flow velocity of the valves and aorta. The second heart sound is divided into P2 enhancement and A2 enhancement; P2 enhancement is often seen due to increased pulmonary blood flow in the pulmonary vasculature, septal ischemia, and increased resistance of the pulmonary circulation; A2 enhancement is mainly seen due to increased resistance to blood flow in the body circulation and increased blood flow, which is produced by cardiopulmonary valve and myotendinous conduction, and is often seen in hypertensive disease. Therefore, if the second heart sound is enhanced, it should be combined with the clinical ECG to distinguish whether it is P2 or A2 enhancement. With ultrasound it is possible to determine in time whether the patient has a ventricular septal defect, mitral stenosis, etc. For further diagnosis cardiac ultrasound is needed to clarify the diagnosis.