Columbia University in the City of New York

History Of The Cardiograph

ecg is a unique diagnostic tool is not as complicated medetsinskogo apparatus which has been termed the electrocardiograph. On it you can determine the regularity of heartbeat, their frequency, and others. All this is of great importance for the diagnosis of various arrhythmias. The duration of different intervals and the electrocardiogram waves can be judged from the changes of cardiac conduction. Changes in the final part of ventricular complex (the interval st and T waves) allow the doctor to determine the presence or absence of ischemic changes in the heart. Another important indicator is the amplitude of ecg wave peaks.

Increase in its shows hypertrophy of relevant departments heart, which is observed in some diseases of the heart and hypertension. ecg, no doubt, very powerful and inexpensive diagnostic tool, but it should be remembered that this method has weaknesses. One is the short duration of recording – about 20 seconds. Even if a person is suffering, such as arrhythmia, at the time of writing, it may be lacking, besides writing, is usually performed at rest and not during usual activities. In order to expand the diagnostic possibilities of resorting to long-term ecg recording thereof, the so-called electrocardiographic Holter monitoring within a certain time that varies from 24 to 48 hours. It is often necessary to assess whether there are ecg patient changes characteristic of ischemic heart disease. To do this, hold a special ecg test with physical exercise.

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