This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
Clinical finding in AV fistula is one of the following 
Select and explain. 
A. Pericarditis, B. Sinus tachycardia, C. Cardiac arrhythmia, D. Hypothermia
B: Sinus tachycardia
Answer: B: Sinus tachycardia 
Explanation: The mechanism behind bradycardia associated with Branham sign is likely similar to the reflex arc that occurs during the Bezold-Jarisch reflex. Presence of an AV fistula results in increased cardiac output because of low resistance across the AV shunt. Ref Davidson 23rd edition pg 467