Home > Specialties > Phonocardiographs


Definition : Cardiographs designed for recording heart sounds at the thoracic body surface. These instruments consist of a main unit that includes a recorder, electroacoustic transducers, signal processors, and detachable probes that include audio sensors (e.g., microphones) at the distal tip that are fixed to anatomic areas on the thorax. The action of heart muscle causes low-frequency sounds, typically in the range of the audio spectrum that are detected at the body surface and transmitted to the recorder which is capable of reproducing their characteristics in an amplitude versus time graph (i.e., a phonocardiogram). Phonocardiographs are used to assess low-frequency sounds (associated with atrial and ventricular gallops) and also relatively higher frequency sounds (associated with mitral regurgitation and ventricular septal defect). The devices can assess both normal sounds (known as S1 and S2 sounds) and abnormal sounds (known as S3 and S4) whose presence may indicate heart dysfunctions*. Some phonocardiographs are capable of recording signals at frequencies below the threshold of the audio spectrum (i.e., subsonic, nonacoustic vibrations) that are mainly produced by the apex of the heart (apexcardiography); the phonocardiographs may also include as an integral unit a single-channel electrocardiograph with appropriate electrodes to work as a reference for the phonocardiogram.

Entry Terms : "Vibrophonocardiographs" , "Stethographs" , "Electrophonocardiographs" , "Electrocardiophones" , "Cardiophones" , "Cardiographs, Heart Sound"

UMDC code : 13017

U.S.companies only
Suppress Subsidiary Companies

1-3 of 3 Match(es).

Cardionics Inc

Company Type: Parent

Cardionics designs and manufactures all of its own products and marketing is done on a worldwide basis.

Data Sciences International

Company Type: Parent

Data Sciences International (DSI) has pioneered the use of wireless implantable devices for monitoring and collecting physiological data to become the global leader in implantable telemetric physiologic monitors. Our technology is the gold standard for monitoring vital signs in animals, which plays an important role in delivering health care to people. In fact, DSI plays an important role in improving the safety of new life-saving pharmaceuticals by providing highly accurate measurements of blood pressure, ECG, EEG, temperature, and activity from animals used to study the effects of these compounds.

Inovise Medical Inc

Company Type: Parent

Acoustic Cardiography combines the time-proven, classic concept of auscultation with state-of-the-art, proprietary techniques for simultaneously detecting, recording, documenting and analyzing the Heart Sounds and Electrocardiogram associated with normal and abnormal cardiac function.

1-3 of 3 Match(es).


Medical Product Guide Optometric Management Product Guide