Which of the following is not true about the mechanism of action of digitalis?
**Core Concept**
Digitalis, also known as digoxin, is a cardiac glycoside used in the treatment of heart failure and atrial fibrillation. Its mechanism of action involves the inhibition of the sodium-potassium ATPase pump, leading to an increase in intracellular sodium and calcium levels, resulting in enhanced contractility of the heart muscle.
**Why the Correct Answer is Right**
The correct answer is based on the understanding of digitalis's mechanism of action. Digitalis works by inhibiting the sodium-potassium ATPase pump, which leads to an increase in intracellular sodium and calcium levels. This increase in calcium levels enhances the contractility of the heart muscle by increasing the amount of calcium available for muscle contraction. This is the primary mechanism by which digitalis exerts its inotropic effect.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, please provide the options A, B, C, and D.
**Option B:** This option is not provided, please provide the options A, B, C, and D.
**Option C:** This option is not provided, please provide the options A, B, C, and D.
**Option D:** This option is not provided, please provide the options A, B, C, and D.
**Clinical Pearl / High-Yield Fact**
One important clinical consideration when using digitalis is the risk of digitalis toxicity, which can occur with high doses or in patients with renal impairment. Digitalis toxicity can manifest as arrhythmias, nausea, and vomiting, and can be life-threatening if not treated promptly.
**Correct Answer:**