[Marked bradycardia during anesthetic induction treated with temporary cardiac pacing in a patient with latent sick sinus syndrome].

A 59 year-old woman with latent sick sinus syndrome was scheduled to undergo ophthalmic surgery including phacoemulsification and aspiration, vitrectomy, photocoagulation and intraocular lens under general anesthesia. Preoperative ECG showed sinus rhythms of 77 bpm without bradycardia or a sinus pause. Total intravenous anesthesia with propofol, fentanyl, ketamine and vecuronium was employed for the induction of anesthesia immediately followed by severe bradycardia with a rate of 36-40 bpm including sinus arrest and atrio/nodal escaped beats. Intravenous atropine was ineffective to restore the heart rate and then urgent temporary pacing was successfully applied to overcome bradycardia. The patient recovered uneventfully from anesthesia. She complained of being dizzy and faint with prominent bradycardia due to sick sinus syndrome three months after the surgery. Therefore she underwent permanent cardiac pacemaker implantation successfully. Temporary pacing is mandatory when anesthesia is given to surgical patients with latent sick sinus syndrome.