Moderate regurgitation was detected in pulmonic, tricuspid and mitral valves.
中度返流仅见于肺动脉瓣、尖瓣和二尖瓣。
2
According to the valvular theory, the vibrations affected by the mitral and tricuspidvalves closure in early systole produce the first heart sound (S1). S1 usually includes many frequency components.