79 yo F is seen for dizziness of 2 months duration. HR is 32-40. EKG is as below.  Repeat EKG is shown here.  What is the diagnosis?
Answer: Second degree. For third degree, QRS will be independent of p wave. Here, all q wave have preceding P wave.  Third degree heart block demonstrating the above description. When there is a skip of 2 or more p -wave being conducted to ventricle, then it is called as high-grade A-V block |