Pulsus Bigeminus is seen in therapy with
**Core Concept**
Pulsus bigeminus refers to a cardiac arrhythmia characterized by the alternation of strong and weak pulses. This condition is often associated with digitalis toxicity, among other causes. The underlying principle involves the effects of certain medications on the heart's electrical conduction system.
**Why the Correct Answer is Right**
Digitalis, a cardiac glycoside, is used to treat heart failure and certain arrhythmias. However, one of its side effects can be digitalis toxicity, which may manifest as pulsus bigeminus. This occurs due to the inhibition of the **Na+/K+ ATPase pump**, leading to increased intracellular calcium and thereby altering the heart's electrical activity.
**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because, while various medications can cause arrhythmias, the specific association with pulsus bigeminus is strongest with digitalis.
**Option B:** Similarly, this option is incorrect as it does not have a direct, well-documented link to pulsus bigeminus.
**Option C:** This choice is also incorrect for the same reason, lacking a direct association with the condition in question.
**Clinical Pearl / High-Yield Fact**
Pulsus bigeminus is a significant finding that can indicate digitalis toxicity, emphasizing the need for careful monitoring of digitalis levels in patients undergoing this therapy. Recognizing this arrhythmia is crucial for timely intervention to prevent more severe complications.
**Correct Answer:** D. Digitalis.