Difference in Blood pressure between Right and Left arm could be an issue.

“A significant difference in the pressure recorded in the right and left arms can signal circulatory problems that may lead to stroke, peripheral artery disease, or other cardiovascular problems.”

http://www.health.harvard.edu/blog/different-blood-pressure-in-right-and-left-arms-could-signal-trouble-201202014174?utm_source=twitter&utm_medium=socialmedia&utm_campaign=073016kr&utm_content=blog