Arrhythmias are commonly associated with cardiovascular emergencies and critical illness. In this 4-hour limited-enrollment session with 3 instructors, we will review the basics of ECG interpretation and then move on to case-based ECG discussions of common tachy- and brady-arrhythmias seen in emergency and critical care settings. For each of these cases, we will first interpret the ECG, discuss the management of the underlying condition but really focus of the management strategy for the arrhythmia. We will specifically review arrhythmia management topics including: 1. Is ok not to treat this arrhythmia, 2. If I decide to suppress this arrhythmia with an anti-arrhythmic drug, which one to use, 3. Is this anti-arrhythmic suppression good enough or should I escalate the dose or try another drug, 4. When to transition to sustained oral anti-arrhythmic suppression, 5. Electrolyte management and many others issues that will no doubt come up in our interactive discussions.