Which parameter should be closely monitored when administering Digoxin?

NORCERT 8 Mains-2025

Pharmacology

Easy

Appeared in: NORCERT 8 Mains-2025

Explanation

Digoxin is a cardiac glycoside with a negative chronotropic effect, meaning it slows the heart rate. It is mandatory to check the apical pulse for a full minute before administration to prevent severe bradycardia.
The standard nursing practice is to withhold the Digoxin dose if the apical pulse is less than 60 beats/min in an adult and notify the provider.
Hypokalemia (low serum potassium) significantly increases the risk of Digoxin toxicity because it enhances the drug's binding to the Na+/K+ ATPase pump in cardiac cells.
Therefore, monitoring both the apical pulse and potassium levels is essential for safe administration of Digoxin.

Option A: Digoxin does not directly influence blood glucose levels. This parameter is critical for patients receiving insulin or oral hypoglycemic agents.
Option C: Digoxin is primarily eliminated from the body by the kidneys, not the liver. Therefore, renal function (creatinine, BUN) is the more critical parameter to monitor for drug accumulation.
Option D: Digoxin does not have a direct pharmacological effect on hemoglobin or red blood cell production.

Visual 1: Diagram: Mechanism of Action of Digoxin on the Na+/K+ ATPase pump, illustrating the competitive binding site with potassium. This helps visualize why low potassium increases drug effect.
Visual 2: ECG Strip: An example of the 'Digoxin effect' (ST segment depression or 'scooping') versus signs of toxicity (e.g., AV block, ventricular dysrhythmias).
Visual 3: Chart: A visual guide showing the therapeutic range of Digoxin (0.5-2 ng/mL) and the signs of toxicity that occur at higher levels.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacology: Monitoring Parameters for Digoxin Administration as background academic context rather than a clinical decision trigger.
A core nursing responsibility is to always assess the apical pulse for one full minute before giving Digoxin. Withholding the dose for a pulse below 60/min is a critical patient safety action.
Patient education must include the signs of Digoxin toxicity (anorexia, nausea, vomiting, visual changes like yellow-green halos) and the importance of reporting them immediately.
What if? If the patient is also prescribed a potassium-wasting diuretic like Furosemide, the nurse must be extra vigilant in monitoring serum potassium levels, as the risk of Digoxin toxicity is significantly increased.

How to Approach the Question

First, identify the drug in the question: Digoxin. Recall its class (cardiac glycoside) and its primary actions on the heart.
Remember the two main safety concerns associated with Digoxin: its effect on heart rate (slowing it down) and its narrow therapeutic index, which is heavily influenced by electrolyte levels.
Evaluate each option based on these two core principles. The drug slows the heart, so monitoring the pulse is essential.
Recall the critical interaction between Digoxin and potassium. Low potassium (hypokalemia) dramatically increases the risk of toxicity.
Based on this, select the option that includes both heart rate and potassium monitoring.
Eliminate the other options by confirming they are not directly related to Digoxin's primary mechanism of action, metabolism, or common adverse effects.

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