Pulsus Bigeminus is seen in therapy with –
**Core Concept**
Pulsus bigeminus is a cardiac arrhythmia characterized by the alternation of strong and weak pulses. This condition is often associated with digitalis toxicity, which affects the heart's electrical conduction system. The underlying principle involves the **atrioventricular (AV) node** and **ventricular automaticity**.
**Why the Correct Answer is Right**
Digitalis, a cardiac glycoside, is used to treat conditions like atrial fibrillation and heart failure. However, its toxicity can lead to abnormal heart rhythms, including pulsus bigeminus. The mechanism involves **increased vagal tone** and **decreased AV nodal conduction**, resulting in the characteristic bigeminal rhythm.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not directly related to digitalis therapy.
**Option B:** Incorrect as it does not typically cause pulsus bigeminus.
**Option C:** Incorrect due to its unrelated mechanism of action.
**Why Each Wrong Option is Incorrect (continued)**
**Option D:** This choice is not the best answer because digitalis is the most well-known cause of pulsus bigeminus.
**Clinical Pearl / High-Yield Fact**
Pulsus bigeminus is a significant finding in patients on digitalis, indicating potential toxicity. Recognizing this arrhythmia is crucial for timely intervention to prevent further complications.
**Correct Answer:** D. Digitalis