, Electro- cardio- gram Fundementals
Depolarisation and repolarizing
Normal 12-lead ECG
Measurement ↑
Heart electrical current
s *
B
②
12-lead electrode placement
Ventricular myocyte action potential of heart beat
↑
Depolarisation=comtracting =sodium (Na)
Repoparisation= relaxation= potassium (k)
Alternative ECG dot placement
Reverse lead placement
Purpose- inferior infarct/ AMI,
Dextracardia,
citrus invertis
Posterior lead placement
Purpose- posterior myocardial
infection