Management of Symptomatic Bradycardia

Initial Assessment and Treatment

The American Heart Association recommends atropine as first-line treatment for symptomatic bradycardia, followed by beta-adrenergic agonists or transcutaneous pacing if atropine is ineffective, while preparing for emergent transvenous temporary pacing if required, in patients with signs and symptoms of instability, including acutely altered mental status, ischemic chest discomfort, acute heart failure, hypotension, and other signs of shock 1, 2, 4
Symptomatic bradycardia requiring treatment is defined by the presence of signs and symptoms of instability, including ischemic chest discomfort, acute heart failure, and hypotension, according to the American College of Cardiology 4

The American College of Cardiology recommends atropine as first-line treatment, with a recommended dose of 0.5-1 mg IV every 3-5 minutes to a maximum total dose of 3 mg, and a Class IIa recommendation with Level of Evidence B 1, 2, 5, 6
Atropine is most effective for sinus bradycardia and AV nodal blocks, but caution is advised as doses <0.5 mg may paradoxically worsen bradycardia due to central vagal stimulation, according to the American Heart Association 4

The American College of Cardiology recommends beta-adrenergic agonists, including dopamine, epinephrine, and isoproterenol, as second-line treatment for symptomatic bradycardia unresponsive to atropine, with a Class IIa recommendation and Level of Evidence B 1, 2, 5
Transcutaneous pacing is a reasonable second-line treatment for unstable patients who do not respond to atropine, with a Class IIa recommendation and Level of Evidence B, according to the American Heart Association 1, 6

The American College of Cardiology recommends transvenous temporary pacing as third-line treatment for symptomatic bradycardia unresponsive to drugs or transcutaneous pacing, with a Class IIa recommendation and Level of Evidence C 1, 7

The American College of Cardiology recommends considering aminophylline for second or third-degree AV block in patients with inferior MI, according to the Journal of the American College of Cardiology 2
Calcium and glucagon are recommended for treatment of drug toxicity, including beta-blocker or calcium channel blocker overdose, according to the American College of Cardiology 2, 5

The American College of Cardiology recommends evaluating and treating potentially reversible causes before determining the need for permanent pacing, and considering long-term monitoring with an implantable cardiac monitor for infrequent symptoms, according to the Journal of the American College of Cardiology 2, 5, 7