STEP 4 .INTERVALS IN ECG INTERPRETATION

•PR interval- 120-200 ms

•Shows how fast impulse travels from SA node to AV node.

•QT INTERVAL

•<440 ms

•Shows the duration for a complete ventricular systole and diastole.

STEP 3 . QRS AXIS IN ECG INTERPRETATION.

•Normal  axis -30 to +90 degrees for all standard limb leads.

Have a positive R wave recording

•Left axis deviation. Limb leads 1 +VE

•11- VE

•RIGHT axis deviation 1 –ve and 11 +ve

•Normal QRS DURATION -80-120 ms

STEP 1 +2 RHYTHM AND RATE IN ECG interpretation.

RATE
•1500 method

•1500/no of small squares  between 2 R waves.

• most accurate method.

RYHTHM 

•Sinus rhythm -SA node

•AV junctional rhythm -AV node.

•Idioventricular rhythm- purkinje in origin.

THE 7 STEP PLAN FOR ECG INTERPRETATION.

 INTERPRETATION OF ECG
Always follow a consistent 7 step plan  and  you wont get lost.

•1.Rhythm

•2.Rate

•3. QRS Axis and duration.

•4. Interval

•5.Wave morphology.

•6.ST segment

•7. Check for any abnormality.