Answer:
Electrocardiograph
(ECG) is a graphical representation of the electrical activity of the heart
during a cardiac cycle. A patient is connected to the machine with three
electrical leads (one to each wrist and one to the left ankle) that
continuously monitor the heart activity. For a detailed evaluation of the heart
functions multiple leads are attached to the chest region.
The QRS complex
represents the depolarisation of the ventricles, which initiates the ventricular
contraction. The contraction starts shortly after Q and marks the beginning of
the systole. The time taken in QRS complex is 0.12 second in normal ECG.
The larger Q and R
wave indicate a myocardial infarction (heart attack). The S-T segment is elevated
in acute myocardial infarction and depressed when the heart muscle receives insufficient
oxygen.
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