Zachary D. Goldberger, MD, covers several upper level topics that go beyond the basics of cardiology. This lecture will help you recognize the cause of a narrow-complex tachycardia and infer the cause based on ECG and clinical presentation. Recognize and distinguish between causes of AV block, and understand the level of the AV block. You'll go through the basic indications for ICD's and permanent pacemakers. Lastly, you'll look at some example ECG's that signal potential catastrophe.