Nerine is an 82-year-old woman who is scheduled for a laparoscopic cholecystectomy for recurrent cholecystitis and cholelithiasis. Nerine is an active individual who walks 5 miles a day, does water aerobics three times a week, and belongs to a square-dancing club. She has a history of hypertension and right carotid stenosis. Her surgical history includes two cesarean sections and a right shoulder replacement. Nerine was taken to the OR as scheduled. She tolerated the anesthesia induction and endotracheal intubation without incident and was hemodynamically stable. Shortly after the surgeon initiated insufflation, the anesthesia provider announced that Nerine was bradycardic. The perioperative nurse noted that Nerine had a heart rate of 30. What is the likely cause of Nerine’s bradycardia?