You are caring for a patient admitted with syncope and sinus bradycardia. You are passing morning medications and you prepare to administer medication for glaucoma. Which category of drugs for glaucoma could exacerbate the patient's heart problems?
a) Prostaglandin analogs
b) Anticholinergic agonists
c) Beta-adrenergic blockers
d) Alpha 2-adrenergic agonists