DEPARTMENT OF INTERNAL MEDICINE, IGGMC NAGPUR.
0 to + 90
0 to -90
-90 to -180
+ 90 to +180
Supraventricular tachycardia
RVH
LVH
RAD
LAD
Right atrial enlargement
Left atrial enlargement
RVH
LVH
LAD
LAA
RAA
RAD
60/min
70/min
90/min
110/min
Deviated to right side.
Normal axis without any deviation.
Deviated to left side.
Deviated to extreme left/ right side.
A - NORMAL AXIS, B - RAD , C - LAD
A- RAD , B-LAD, C - NORMAL AXIS
A - LAD , B RAD , C - NORMAL AXIS
BOTH A & B ARE VARIANT OF NORMAL AXIS WHILE C IS EXTREME AXIS DEVIATION
0.2 sec
0.12 sec
0.16 sec
0.8 sec
A normal T wave has an asymmetrical shape.
As the heart rate increases , QT interval increases and as the heart rate decreases, QT interval decreases. Therefore,rate corrected QT or QTc is preferred in clinical practice.
The QT interval is measured from the beginning of the QRS complex to the end of the T wave.
It represents the return of stimulated ventricles to their resting state (ventricular repolarization).
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