short notes on ECG

right ventricular hypertrophy

1. tall R wave in V1
2. T inversion V1-V3/V4
3. deep S in V6
4. right axis
5. RBBB

left ventricular hypertrophy

1) R wave in V6 greater than 25mm
2) R wave in V6 plus S in V1 greater than 35mm
3) Inverted T in V1 ,VL, V5-V6

left atrial hypertrophy

1) Bifid P wave

right atrial hypertrophy

1) Peaked P wave

myocardial infarction

1) Normal ECG
2) Raised ST segment
3) Appearance of Q wave
4) Normalisation of ST segment
5) Invertion of T wave

*Site of infarction

Þ Anterior infarction – changes in V2 – V5
Þ Inferior infarction – changes in III and aVF
Þ Lateral infarction – changes in I, aVL, V6
Þ True posterior infarction – dominant R in V1