TY - JOUR
AU - Fisher, E. W.
AB -  E. W. FISHER Department o Veterinary Medicine, Uniuersip o Glasgow, Scotland f f THE recording of heart sounds serves several purposes. I t enables repeated leisurely study of the sounds recorded, possibly to attempt to correlate sounds with lesions found at postmortem. It allows such records to be used for the purposes of teaching. It makes detailed analysis of the components of the sounds recorded possible. Two main methods of the recording of heart sounds are used. The sounds may be recorded on gramophone records (or on electromagnetic tape by means of a tape recorder) for later reproduction as sounds. This method is the least useful. By the use of suitable electronic apparatus heart sounds may be graphically represented. Such records are called ‘phonocardiograms’. Phonocardiograms, by the use of eIectronic filters are usually recorded in such a way that the varying frequenciesof the sounds are separated. Thus it is possible to analyse, for example, the low frequency components, the middle frequency components and the high frequency components. To obtain the maximum value from the phonocardiograms it is usual to record simultaneously an electrocardiogram so that the exact place in the cardiac cycle where sounds occur can be ascertained. 
TI - Heart Sound Recording *
JF - Journal of Small Animal Practice
DO - 10.1111/j.1748-5827.1967.tb04539.x
DA - 1967-03-01
UR - https://www.deepdyve.com/lp/wiley/heart-sound-recording-PQY4ffB0ih
SP - 171
VL - 8
IS - 3
DP - DeepDyve
ER -