Prayer request for Dad

A few months ago, my dad had surgery to clear his carotid artery and quadruple bypass on his heart. He recovered well, but still needed more help. He went in on Tuesday to have 3 stents put into his other carotid and 1 in his left leg to open up blood flow in those arteries. He should have been discharged by Thursday, but wasn't because his heart rate and blood pressure were low. Since Wednesday, he's had a couple episodes where his heart "pauses" for a few beats, then resumes working. His heart rate has dropped as low as the 20s during these episodes. To help his heart, the doctors are going to put a pacemaker in on Monday. Since my dad is so tiny (5'5", 105 pounds) there isn't a whole lot of meat to hold the pacemaker in place, so they basically have to create a skin pocket. They have an external pacer in his room in case he really drops, but hopefully they won't be needing that. Please pray for my dad, his heart and the medical staff working with him. Thanks!