ECG is an easy G

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Slide 1

ECG is an easy G Dr. Hesham Khairy

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VR VL VF + - + + - - I II III Limb leads Uni- and bi-polar

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Unipolar chest leads v1 v2 v4 v3 v6 v5

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summary Electrodes (exploring - indifferent). Leads (unipolar - bipolar) Unipolar leads (limb – chest)

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Einthoven (Nobel Prize - 1924)

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Einthoven (Nobel Prize - 1924) I II III VL VR VF 0 +180 -180 Hexaxial reference system Einthoven triangle

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Einthoven conclusions Bipolar limb leads Einthoven triangle Augmented limb leads (aVL,aVR,aVF) 1+3 = 2 Hexaxial reference system Electrical axis of the heart

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ECG trace Big square = 5 small squares small square = → 0.04 sec & ↑ 0.1 mV Wave direction: depend on Lead

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Normal ECG record (lead III) P Q R S T

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Reading ECG Rhythm Rate Waves Interval Segment Axis

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Reading ECG 1. Rhythm: R-R interval Comment : regular or irregular

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Reading ECG 2. Heart Rate: 1500/no of small square R-R Comment : heart rate is 1500/18 = 83 beat/min

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Reading ECG 3. Waves:

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Reading ECG 4. Interval: P-R beginning P → beginning R Duration: 3 -5 small squares Representation Comment : Normal duration

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Reading ECG 5. Segment: S-T end S → beginning T Representation Comment : isoelectric

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Reading ECG : Electrical axis III VR I + + - - I III Comment : normal axis + 60 degree.

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Reading ECG : Electrical axis III VR I + + - - I III Rt. dev

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Reading ECG : Electrical axis III VR I + + - - I III Lt. dev

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Normal unipolar Limb Lead aVR aVL aVF aVR aVL aVF

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Normal unipolar chest Lead rS R=S QRS

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Reading ECG Rhythm Rate Waves Interval Segment Axis

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