What do you give for tricyclic overdose?
Administration of intravenous sodium bicarbonate as an antidote has been shown to be an effective treatment for resolving the metabolic acidosis and cardiovascular complications of TCA poisoning.
Why is sodium bicarb given for TCA overdose?
The benefit of sodium bicarbonate in the setting of TCA overdose is probably due to both an increase in serum pH and the increase in extracellular sodium. Alkalization favors the neutral form of the drug and reducing the amount of active cyclic antidepressants.
When do you intubate in TCA overdose?
Endotracheal intubation is indicated if the patient cannot adequately maintain a safe airway. Serum alkalinization with intravenous sodium bicarbonate has been the mainstay of therapy in CA-induced cardiovascular toxicity. QRS prolongation is most often the indication for serum alkalinization in CA toxicity.
What are the clinical manifestations of tricyclic antidepressant overdose toxicity?
The most common clinical features are dry mouth, blurred vision, dilated pupils, sinus tachycardia, pyramidal neurological signs, and drowsiness. In severe poisoning, there may be coma, convulsions, respiratory depression, hypotension and a wide range of electrocardiographic (ECG) abnormalities.
What happens with amitriptyline overdose?
The abnormal findings in amitriptyline overdosage include anticholinergic symptoms (pupil dilatation, tachycardia, urinary retention, etc.), cardiac complications (a prolonged QTc interval or QRS duration, sinus tachycardia), respiratory depression/insufficiency, hypotension, impaired consciousness (from lethargy to …
Why are tricyclic antidepressants so toxic in overdose?
TCAs are rapidly absorbed in the gastrointestinal tract. However, following an overdose, owing to the inherent anticholinergic effects, TCAs may decrease the gastrointestinal motility and cause delayed absorption and toxicity. Coingestion of other anticholinergic medications may cause more erratic absorption.
Why is amiodarone contraindicated in TCA overdose?
Class III drugs (eg, amiodarone, sotalol) are contraindicated because they can further prolong the QT interval, leading to ventricular dysrhythmia.
What happens in amitriptyline overdose?
Overdose of amitriptyline and other tricyclic antidepressants is characterized, in part, by anticholinergic effects such as coma, respiratory depression and tachycardia, along with consequences of sodium channel blockade, including prolongation of the QRS complex and negative inotropy [1].
How does TCA cause metabolic acidosis?
The amount of unbound tricyclic may also increase if the overdose causes respiratory depression resulting in an acidosis, which reduces protein binding. The toxic effects of tricyclics are caused by four main pharmacological properties: Inhibition of norepinephrine reuptake at nerve terminals.