Question

A patient presents with digoxin toxicity. Pulse rate is 54/min with ECG evidence of a degree heart block. What is the best treatment?

• A. Digoxin immune fab
• B. Lidocaine
• C. DC shock
• D. Phenytoin

Hint:

For digoxin toxicity, digoxin immune fab is the most effective treatment for reversing the toxic effects.

Answer 1

The Correct Option is A

Digoxin is a cardiac glycoside commonly used in the management of various heart conditions, such as atrial fibrillation and heart failure. Digoxin toxicity can occur due to an overdose or increased sensitivity to the drug, leading to symptoms such as nausea, vomiting, dizziness, confusion, and various cardiac arrhythmias, including heart blocks.

In the given question, a patient presents with digoxin toxicity characterized by a low pulse rate (54/min) and evidence of degree heart block on the ECG. Recognizing this as a potential life-threatening condition, it is crucial to address the underlying cause, which in this case is the digoxin toxicity.

1. Digoxin Immune Fab: This is an antidote used in cases of digoxin toxicity. It consists of anti-digoxin antibodies that bind to digoxin, forming complexes that are then excreted by the kidneys, thereby reducing the free digoxin level in the body. It is effectively the best and most direct treatment for severe digoxin toxicity, especially when there are life-threatening arrhythmias or evidence of significant cardiovascular compromise, such as a degree heart block.
2. Lidocaine is an antiarrhythmic that can be used for certain types of ventricular arrhythmias, but it is not specifically useful in digoxin toxicity with heart block.
3. DC shock, or direct current cardioversion, is used for converting certain types of arrhythmias but is not effective in treating digoxin-induced heart block, and it can be dangerous if the underlying cause of the arrhythmia is digoxin toxicity.
4. Phenytoin is another antiarrhythmic that historically has been used in digoxin toxicity, particularly for ventricular arrhythmias, but it is less effective than digoxin immune Fab and not the first-line treatment for cases with heart block or severe toxicity.

Therefore, the best treatment in this scenario for the digoxin toxicity with heart block is Digoxin immune Fab, as it directly counteracts the effect of excess digoxin.