Sodium bicarbonate is indicated for a TCA overdose when which symptoms are present?

Sodium bicarbonate is indicated for a TCA overdose when which symptoms are present?

• A. SBP <90 and QRS >0.12 seconds
• B. Seizures only
• C. QRS >0.12 seconds
• D. SBP <90, QRS >0.12 seconds, and Seizures

Answer: (D)

Sodium bicarbonate in TCA overdose is used to counteract sodium channel blockade in the heart and to support perfusion by alkalinizing the blood and increasing sodium load. The strongest indication is when multiple signs of severe toxicity are present, because they reflect both cardiac and CNS involvement that bicarbonate helps address. The combination of low systolic blood pressure (less than 90), widened QRS complex (greater than 0.12 seconds), and seizure activity indicates a high-risk overdose where administering bicarbonate can rapidly improve electrical conduction and stabilize hemodynamics. If only one or two of these signs were present, the decision to use bicarbonate would be less clear and would depend on the overall clinical picture, but the full triad shows the most evident need for this treatment.

Sodium bicarbonate in TCA overdose is used to counteract sodium channel blockade in the heart and to support perfusion by alkalinizing the blood and increasing sodium load. The strongest indication is when multiple signs of severe toxicity are present, because they reflect both cardiac and CNS involvement that bicarbonate helps address. The combination of low systolic blood pressure (less than 90), widened QRS complex (greater than 0.12 seconds), and seizure activity indicates a high-risk overdose where administering bicarbonate can rapidly improve electrical conduction and stabilize hemodynamics. If only one or two of these signs were present, the decision to use bicarbonate would be less clear and would depend on the overall clinical picture, but the full triad shows the most evident need for this treatment.