IPHREHAB : ELECTROCARDIOGRAPHY, ECG, HEART

IPHREHAB


ELECTROCARDIOGRAPHY
BASIC PRINCIPLES


ELECTROCARDIOGRAM

• IT IS SOPHISTICATED GALVANOMETER AND SENSITIVE ELECTROMAGNET
• IT RECORDS ELECROMAGNET POTENTIALS
• IT HAS POSITIVE AND NEGATIVE POLE 

ECG   PAPER

• IT IS DIVIDED IN SMALL AND LARGE SQUARES
• IT IS WAX COATED
• SMALL ARE 1 mm SQUARE
• LARGE ARE 5mm SQUARE
• THEY MOVE AT RATE OF 25 mm PER SECOND

LEADS

• THEY RECORD POTENTIALS
• THERE ARE SIX LIMB LEADS   
•   I   II   III  aVR   aVL   aVF

• THERE ARE  SIX  CHEST  LEADS    
•  v1  v2  v3  v4  v5  v6

FORMATION OF ECG IN HEART:


WAVES:

• P WAVE Indicates Atrial Contraction 
• PR INTERVAL- Time taken by impulse to travel from Atria to Ventricle
• QRS- indicates Ventricular complex  Q is due to interventricular depolarisation  R is due to Apical Depolarisation  S is due to depolarisaion of base of heart
• T is repolarisation of ventricle