Clinical finding in AV fistula is one of the following
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
Pericarditis
Sinus tachycardia
Cardiac arrhythmia
Hypothermia
C.V.S