ATI RN
Herzing University NSG144 Questions
Question 1 of 1
What is the primary action of Digoxin that leads to these findings?
Correct Answer: A
Rationale: Digoxin enhances cardiac contractility by inhibiting the Naâº/Kâº-ATPase pump in cardiac myocytes, resulting in increased intracellular calcium levels via the Naâº/Ca²⺠exchange mechanism. This increase improves myocardial contractile force while simultaneously promoting vagal stimulation that slows heart rate. The combined effect increases cardiac output and efficiency, particularly in heart failure and atrial fibrillation. Digoxin’s dual mechanism—positive inotropy and negative chronotropy—makes it distinct among cardiac glycosides.
Question 2 of 1
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Question 5 of 1
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