Explore a comprehensive 2.5-hour lecture on cardiac arrhythmias, covering both atrial and ventricular abnormalities as well as tachycardia and bradycardia. Delve into the intricacies of normal cardiac rhythm, various types of arrhythmias, and their underlying mechanisms. Learn about sinus arrhythmias, atrial tachyarrhythmias, junctional arrhythmias, and ventricular arrhythmias, along with their corresponding ECG patterns. Gain insights into heart blocks, including first, second, and third-degree blocks, and understand the differences between flutter and fibrillation. Examine the electrical activity of the heart and explore specific conditions such as Wolff-Parkinson-White syndrome and sick sinus syndrome. Master the interpretation of ECG recordings and their significance in diagnosing various cardiac rhythm disorders.