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Normal ECG Pattern (First deflection = P wave (Depolarization of atrial…
Normal ECG Pattern
First deflection = P wave
Depolarization of atrial cells
Contraction of atria
Cardiac impulse reaches ventricular cells
Electrical charge ends = QRS complex
QRS appears - depolarization of ventricles before contraction
T wave
End of ECG pattern
Ventricular repolarization
Ventricular depolarization
SA node triggers cardiac impulse
Atrial depolarization
Recording of electrical changes in myocardium during cardiac cycle
Action potentials stimulate cardiac muscle cells to contract
Between cycles muscle cells have to be polarized with no detectable changes
Assesses the heart's ability to conduct impulses
Cardiac cycle
SA node = pacemaker - initiates impulses
Internodal atrial muscle conduct impulses
Right + left atria contract simultaneously
Cardiac impulses pass along functional fibers to AV node
Impulse is delayed - allows atria to contract completely
Impulse moves through AV bundle
Impulse moves to Purkinje fibers
Ventricular myocardium contracts as a functioning unit
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