What is the appropriate management for a bisoprolol overdose?

Management of Bisoprolol Overdose

For bisoprolol overdose with hypotension refractory to initial measures, administer high-dose insulin euglycemic therapy as first-line treatment, combined with vasopressors 1.

Initial Stabilization and Monitoring

Stop bisoprolol immediately and provide supportive care 2. Expect cardiovascular symptoms within 2 hours of ingestion for immediate-release formulations 3. Monitor for:

• Bradycardia and hypotension (most common manifestations) 2, 4
• Congestive heart failure and cardiogenic shock 1, 2
• Hypoglycemia (administer IV glucose if present) 1, 2
• Bronchospasm (less common but possible) 2

Note that bisoprolol is not dialyzable according to FDA labeling 2, though the EXTRIP workgroup suggests hemodialysis may be reasonable for specific beta-blockers like atenolol or sotalol 1. For bisoprolol specifically, one recent case report describes successful use of continuous kidney replacement therapy in the setting of concurrent hepatic and renal dysfunction 5, but this is not standard practice.

Treatment Algorithm by Severity

For Bradycardia:

1. Atropine IV (may be reasonable, though evidence is limited) 1, 2
2. If inadequate response: Isoproterenol or other positive chronotropic agents 2
3. Consider electrical pacing (may be reasonable for refractory cases) 1
4. Transvenous pacemaker insertion if second or third-degree heart block develops 2

For Hypotension:

1. IV fluids and vasopressors (Class 1 recommendation) 1, 2

   • Vasopressors are readily available and act quickly, making them almost always the initial therapy 1

2. High-dose insulin euglycemic therapy (Class 1, Level B-NR recommendation) 1

   • This is the strongest recommendation for refractory hypotension
   • Improves inotropy in cardiogenic shock from beta-blocker poisoning
   • Associated with lower rates of vasoconstrictive complications compared to vasopressor-only therapy 1
   • Should be administered for hypotension refractory to OR in conjunction with vasopressor therapy 1

3. Glucagon bolus followed by continuous infusion (Class 2a recommendation) 1

   • Reasonable for bradycardia or hypotension
   • Increases contractility and improves hemodynamics 1
   • FDA labeling also supports IV glucagon use 2

For Refractory Cardiogenic Shock:

VA-ECMO (Class 2a recommendation) - It is reasonable to utilize extracorporeal life support for life-threatening beta-blocker poisoning with cardiogenic shock refractory to maximal pharmacological interventions 1. Case reports and observational studies suggest this may be life-saving 1.

Important Caveats

Intravenous lipid emulsion therapy is NOT recommended (Class 3: No Benefit) for life-threatening beta-blocker poisoning 1. This is a critical pitfall to avoid, as it is not likely to be beneficial despite its use in other toxicological emergencies.

Additional Supportive Measures:

• Bronchospasm: Administer bronchodilators (isoproterenol and/or aminophylline) 2
• Congestive heart failure: Initiate conventional therapy with digitalis, diuretics, inotropic agents, and vasodilating agents 2

Key Clinical Considerations

The 2023 AHA guidelines 1 represent the most authoritative and recent evidence, prioritizing high-dose insulin and vasopressors as the cornerstone of management. While glucagon has historical use and FDA support 2, it receives a lower level of recommendation (Class 2a) compared to high-dose insulin (Class 1).

Wide variability exists in bisoprolol serum concentrations at the same dose 6, and patients with reduced cardiac or renal function may be more prone to toxicity. However, most adult single-substance bisoprolol overdoses recover with appropriate supportive care 7. Co-ingestions with other antihypertensives significantly increase risk - one fatality occurred with bisoprolol-verapamil co-exposure 7.