Digoxin is used in congestive hea failure is associated with
**Core Concept**
Digoxin is a cardiac glycoside used in the treatment of congestive heart failure (CHF) and atrial fibrillation. It works by inhibiting the sodium-potassium ATPase pump, leading to an increase in intracellular calcium and enhanced contractility of the heart muscle.
**Why the Correct Answer is Right**
Digoxin increases the force of cardiac contractions by inhibiting the sodium-potassium ATPase pump, which leads to an increase in intracellular calcium. This increase in calcium binds to troponin and tropomyosin, causing a conformational change that ultimately leads to muscle contraction. The enhanced contractility of the heart muscle improves cardiac output and reduces symptoms of CHF.
**Why Each Wrong Option is Incorrect**
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**Clinical Pearl / High-Yield Fact**
Digoxin toxicity is a concern in patients with renal impairment, as the drug is primarily excreted by the kidneys. A key clinical finding of digoxin toxicity is a characteristic "saw-tooth" pattern on the electrocardiogram (ECG), which is due to the drug's effect on the sinoatrial (SA) node and the atrioventricular (AV) node.
**Correct Answer:**
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