An elderly man presents to the ER for a laceration of his hand and was noted to be bradycardic. An rhythm strip was performed and documented a wide complex, bradycardic rhythm. You are asked to see him.
He was completely asymptomatic, but the ER doctors were concerned and thought he might need a pacemaker. You decide to perform carotid massage, with the results shown:
Click image to enlarge
PS: (EP's: please refrain for about 12 hours or so to let others have some fun... thanks!)