ELECTROCARDIOGRAPHY: MODERN TRENDS IN INSTRUMENTATION AND VISUAL AND DIRECT RECORDING ELECTROCARDIOGRAPHY

Abstract

Many of the easily available potentialities of electronic devices have not been utilized in electrocardiography, and until recently the trend has been to imitate the recordings of the string galvanometer. A comparison between clinical ecgs. and a direct coupled cathode ray ecg. was made on 10 normal males. Restrictions of frequency response of the clinical ecgs. tested resulted in definite distortions of the ecg. components and loss of fine detail. Modern developments in cathode ray tube and electronic devices permit the assembly of multichannel ecgs. of high fidelity at low cost both for visual observation and photographic recording. A cathode ray ecg. is illustrated and its value discussed from the standpoint of fidelity, visual and photographic observations, and use in conjunction with a direct recording ecg. for making ecg. surveys.