生理性杂音,又叫无害性,或功能性杂音,它是指心血管系统无疾病存在或心脏内外无解剖及功能异常时所听到的杂音,健康小儿约半数有此杂音。临床上一般分为两类,一是完全无害性杂音,二是相对无害性杂音。本文就完全无害性杂音做一简略介绍: 1 临床常见完全无害性杂音 1.1 乐音样收缩期杂音常见于3～7岁。青春期后多自然消失,特点:①部位在胸骨左缘第3～4肋间、心尖部或胸骨左缘与心尖之间。②占收缩期的前半部或 Physiological noise, also known as innocuous, or functional murmur, it refers to the absence of cardiovascular disease or heart disease without anatomical and functional abnormal noise heard, about half of healthy children have this noise. Clinically generally divided into two categories, one is completely harmless murmur, the second is relatively harmless murmur. This article on a completely harmless murmur to do a brief introduction: 1 clinical common harmless murmur 1.1 music-like systolic murmur common in 3 to 7 years old. After adolescence more than natural disappearance, features: ① site in the sternum left margin of 3 to 4 intercostal, apical or sternal left edge and apex. ② accounting for the first half of systole or