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Prof. Ashraf Husain
Arrhythmia is defined as irregular impulse formation in the form of rate, conduction or change in interrelationship of timing of R-R interval
Change slope Symp.
Change thrashold
Phase 4 change in slope. PS
Change in RMP
Atrial re-entry Atrial tachycardia Atrial fibrilation Atrial flutter
AV Nodal re-entry Supraventricular tachycardias
AV re-entry (Aberent) WPW synd. Supraventricular tachy
Ventricular re-entry Ventricular tachycardias
many go unnoticed and produce no symptoms
palpitations - ranging from ³noticing´ or ³being aware´ of ones heartbeat to a sensation of the heart ³beating out of the chest´
if Q is affected (HR > 300) - lightheadedness and syncope, fainting
drugs & electrolyte imbalances - antiarrhythmic drugs, hypokalemia,imbalances of calcium and magnesium
very rapid arrhythmias u myocardial oxygen demand r ischemiaand angina
sudden death - especially in the case of an acute MI‡ mechanism differentiation from ECG very difficult to impossible