For an overdose of tricyclic antidepressants, which treatment is typically administered?

In cases of tricyclic antidepressant (TCA) overdose, administering sodium bicarbonate is a critical intervention. This treatment works by addressing metabolic acidosis which often occurs during TCA overdose and can help to stabilize cardiac function by preventing and treating the toxic effects on the heart. Sodium bicarbonate increases the blood pH and can improve the binding of the drugs to their target receptors due to altered ionization at physiological pH levels.

Additionally, this treatment specifically reduces the risk of life-threatening arrhythmias that are associated with TCA toxicity, which can lead to significant cardiovascular complications. Therefore, the use of sodium bicarbonate is not only a means to correct metabolic disturbances but also serves a protective role for the cardiac system in the context of TCA overdose.

Other treatments, such as the ones listed in the alternative choices, are not appropriate for managing TCA toxicity. For instance, Romazicon (a benzodiazepine antagonist) does not target TCA effects, N-Acetylcysteine is primarily used for acetaminophen overdose, and calcium chloride is not indicated for TCA overdoses. Understanding the specific pharmacological actions and mechanisms of each treatment helps clarify why sodium bicarbonate is the preferred choice for this particular circumstance.