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Wiggers diagram of various events of a cardiac cycle, including a phonocardiogram at bottom.

A Phonocardiogram or PCG is a plot of high fidelity recording of the sounds and murmurs made by the heart with the help of the machine called phonocardiograph, or "Recording of the sounds made by the heart during a cardiac cycle." The sounds are thought to result from vibrations created by closure of the heart valves. There are at least two: the first when the atrioventricular valves close at the beginning of systole and the second when the aortic valve closes at the end of systole. It allows the detection of subaudible sounds and murmurs, and makes a permanent record of these events. In contrast, the ordinary stethoscope cannot detect such sounds or murmurs, and provides no record of their occurrence. The ability to quantitate the sounds made by the heart provides information not readily available from more sophisticated tests, and provides vital information about the effects of certain cardiac drugs upon the heart. It is also an effective method for tracking the progress of the patient's disease.

Phonocardiogram and jugular venous pulse tracing from a middle-aged man with pulmonary hypertension (pulmonary artery pressure 70 mm Hg) caused by cardiomyopathy. The jugular venous pulse tracing demonstrates a prominent a wave without a c or v wave being observed. The phonocardiograms (fourth left interspace and cardiac apex) show a murmur of tricuspid insufficiency and ventricular and atrial gallops.^[1]

References [edit]

^ http://www.ncbi.nlm.nih.gov/bookshelf/br.fcgi?book=cm&part=A622&rendertype=figure&id=A633

External links [edit]

Some wav files of phonocardiogram

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1. 僧帽弁逸脱および僧帽弁尖動揺における慢性僧帽弁閉鎖不全症の自然史 natural history of chronic mitral regurgitation in mitral valve prolapse and flail mitral leaflet
2. 心雑音の聴診 auscultation of cardiac murmurs

English Journal

Cardiac MRI: evaluation of phonocardiogram-gated cine imaging for the assessment of global und regional left ventricular function in clinical routine.

Nassenstein K, Orzada S, Haering L, Czylwik A, Zenge M, Eberle H, Schlosser T, Bruder O, Muller E, Ladd ME, Maderwald S.SourceDepartment of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Hufelandstrasse 55, 45122, Essen, Germany, Kai.Nassenstein@uni-due.de.
European radiology.Eur Radiol.2011 Sep 24. [Epub ahead of print]
OBJECTIVES: To validate a phonocardiogram (PCG)-gated cine imaging approach for the assessment of left ventricular (LV) function.METHODS: In this prospective study, cine MR imaging of the LV was performed twice in 79 patients by using retrospectively PCG- and retrospectively ECG-gated cine SSFP sequ
PMID 21947482

A color spectrographic phonocardiography (CSP) applied to the detection and characterization of heart murmurs: preliminary results.

Sarbandi RR, Doyle JD, Navidbakhsh M, Hassani K, Torabiyan H.SourceDepartment of Biomechanics, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Biomedical engineering online.Biomed Eng Online.2011 May 31;10:42.
BACKGROUND: Although cardiac auscultation remains important to detect abnormal sounds and murmurs indicative of cardiac pathology, the application of electronic methods remains seldom used in everyday clinical practice. In this report we provide preliminary data showing how the phonocardiogram can b
PMID 21627809