- Physiology of Cardiac Conduction Cardiac Conduction Wave.pdf3/20/13 1 Cardiac Conduction Physiology...
Physiology of Cardiac Conduction Cardiac Conduction Wave.pdf3/20/13 1 Cardiac Conduction Physiology of Cardiac Conduction • The excitatory electrical conduction system of the heart
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Physiology of Cardiac Conduction
The excitatory & electrical conduction system of the heart is responsible for the contraction and relaxation of the heart muscle.
The sinoatrial node (SA node) is the pacemaker where the electrical impulse is generated.
How to Read an
PQRST wave Deflection waves
Lasts 0.08 s Shows Atrial contraction
Results due to depolarization of ventricles Ventricular contraction R waves are deflected positively and the Q and S waves
T wave Results due to ventricular decontraction (Relax)
Normal ECG Deflection Wave Pattern
Abnormal ECG Deflection Wave Patterns
Rate = 40-59 b.p.m.
Rate = 101-160 b.p.m.
CHF, hypoxia, pulmonary edema Increased temperature Stress or response to pain
Rate = 45-100 b.p.m.
Rate = 250-350 b.p.m.
Atrial Fibrillation (afib)
Digitalis toxicity Acute infection MI Degeneration of the conductive tissue.
Ventricular Tachycardia (V-tac)
Causes CAD Acute MI Digitalis toxicity CHF
Rate = 100-220 b.p.m.
Ventricular Fibrillation (V-fib)