Pansini R, Longhini C, Portaluppi F, Arslan E, Ravenna F, Toselli T
G Ital Cardiol. 1980;10(6):777-80.
"Precordial honk" is a loud, high pitched, musical and usually intermittent systolic noise. The concept of extracardiac origin and "inocence" of this finding is superseded and today its valvular origin during mitral prolapse, mitral or tricuspidal insufficiency - due to rheumatic or ischaemic disease - or during cardiomiopathy is demonstrated. The acoustic characterization of this finding was based on phonocardiographic registration. All the authors describe the "precordial honk" as a high frequency murmur without specifying the acoustic characteristics of the phenomenon. A spectral analysis technique applied to the acoustic cardiac signal (Fourier analysis) has been employed in order to study the "precordial honk" of a 15-year-old boy with mitral valve prolapse. This made possible to show that this sound had only one fundamental frequency at 300 Hz. without harmonics; a "sea gull cry" murmur (as the cry of many birds is) justifying the name given by clinicians. The spectral analysis of phonocardiography signal allow to study, more precisely, the cardiac acoustic phenomenon.
“心前区鸣响”是一种响亮、高音调、呈音乐性且通常为间歇性的收缩期杂音。这种表现的心外起源及“无害性”这一概念已被取代，如今已证实其起源于二尖瓣脱垂、风湿性或缺血性疾病所致的二尖瓣或三尖瓣关闭不全时，或心肌病时的瓣膜。这一表现的声学特征基于心音图记录。所有作者都将“心前区鸣响”描述为高频杂音，但未具体说明该现象的声学特征。为研究一名患有二尖瓣脱垂的15岁男孩的“心前区鸣响”，已采用一种应用于心脏声学信号的频谱分析技术（傅里叶分析）。这使得能够表明该声音仅在300赫兹有一个基频，且无谐波；一种“海鸥鸣叫声”杂音（正如许多鸟类的叫声）解释了临床医生所赋予的名称。心音图信号的频谱分析能够更精确地研究心脏声学现象。
