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Standard ECG
ECG at rest
Exercise ECG
Continuous ECG
ECG specific features
Medical engineering
For more than 60 years electrical excitation of the cardiac muscle - cardiac current flows – have been recorded with special signal acquisition equipment on the body surface. To this end an electrocardiogram (ECG) is generated. Only by means of this cardiac current flow curve can it be discovered, whether the signal output and signal transfer take place correctly in the heart. A better analysis of the ECG curve will be achieved when the waves and points of an interval (complete electrical excitation per pulse) are marked with the letters P, Q, R, S and T. If the controlled spread of the electrical excitation is disturbed, e.g. by heart disease and/or by drug taking, this can be seen in the shape of the curve. Certain sections can be shortened (this frequently concerns the PQ time) or extended (e.g. the QT time, this is the section from the QRS complex up to and including the T wave). If the heartbeat is accelerated (tachycardia), more intervals per time unit can be recognized, if the heartbeat is slowed down (bradycardia), there will be less intervals.