Which rhythm is described as very dangerous in acute myocardial infarction or heart disease and is commonly caused by digoxin toxicity, presenting with a rapid, regular pulse and signs of decreased cardiac output?

Which rhythm is described as very dangerous in acute myocardial infarction or heart disease and is commonly caused by digoxin toxicity, presenting with a rapid, regular pulse and signs of decreased cardiac output?

• A. Atrial Tachycardia
• B. Atrial Flutter
• C. Atrial Fibrillation
• D. Junctional Tachycardia

Answer: (A)

Digoxin toxicity can trigger atrial tachyarrhythmias, and in someone with acute myocardial infarction or significant heart disease, a rapid, regular atrial tachycardia is especially dangerous because it shortens diastolic filling time. The heart is already compromised, so a fast, steady atrial rate that conducts to the ventricles can dramatically reduce stroke volume and cardiac output, leading to hypotension and poor perfusion. This pattern fits atrial tachycardia: a rapid rhythm that remains regular, as opposed to atrial fibrillation, which is characteristically irregular, or atrial flutter, which often shows a sawtooth flutter pattern. Junctional tachycardia, while also a tachyarrhythmia, originates near the AV node and has different P-wave characteristics and typical timing that don’t match the classic digoxin-related presentation described here. In the setting of digoxin toxicity with heart disease, atrial tachycardia is a recognized, particularly hazardous rhythm because of its hemodynamic impact. If digoxin toxicity is suspected, management focuses on stopping digoxin, correcting electrolytes, and, in severe cases, administering digoxin-specific antibody fragments.

Digoxin toxicity can trigger atrial tachyarrhythmias, and in someone with acute myocardial infarction or significant heart disease, a rapid, regular atrial tachycardia is especially dangerous because it shortens diastolic filling time. The heart is already compromised, so a fast, steady atrial rate that conducts to the ventricles can dramatically reduce stroke volume and cardiac output, leading to hypotension and poor perfusion. This pattern fits atrial tachycardia: a rapid rhythm that remains regular, as opposed to atrial fibrillation, which is characteristically irregular, or atrial flutter, which often shows a sawtooth flutter pattern. Junctional tachycardia, while also a tachyarrhythmia, originates near the AV node and has different P-wave characteristics and typical timing that don’t match the classic digoxin-related presentation described here. In the setting of digoxin toxicity with heart disease, atrial tachycardia is a recognized, particularly hazardous rhythm because of its hemodynamic impact. If digoxin toxicity is suspected, management focuses on stopping digoxin, correcting electrolytes, and, in severe cases, administering digoxin-specific antibody fragments.