This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ECG and Arrhythmias 1, Subject name: Medicine
Increased AV nodal blockade leads to termination of tachycardia in all except? 
Select and explain. 
A. Atrial tachycardia, B. Atrial flutter, C. AVN, D. Ohodromic AV re-entry
B: Atrial flutter
Answer: B: Atrial flutter 
Explanation: Tachycardia can not be terminated by increased AV nodal blockade in Atrial Flutter because it will be having separate reentry circuit which bypasses the AV node. CAVOTRICUSPID ISTHUMUS DEPENDENT ATRIAL FLUTTER