A nurse is caring for a patient receiving digoxin therapy. Which assessment finding would be the MOST important for the nurse to report immediately to the healthcare provider?
1Heart rate of 58 beats per minute with regular rhythm
2Serum potassium level of 3.2 mEq/L reported from morning lab results
3Patient reports mild nausea and decreased appetite since yesterday
4New onset of yellow-green halos around lights and blurred vision✓ 정답
해설
Visual disturbances like yellow-green halos are classic signs of digoxin toxicity requiring immediate intervention. Other findings (bradycardia, hypokalemia, mild GI symptoms) are concerning but less urgent.
Clinical Judgment
This question assesses your ability to set priorities (Prioritization) and identify specific signs of digoxin toxicity (Digoxin Toxicity). The key is to find the single finding that is the "MOST important" and must be "immediately reported." While the symptoms of digoxin toxicity are varied, visual disturbances (especially xanthopsia) are highly specific to toxicity and serve as a critical warning sign before progression to life-threatening, serious arrhythmias. The other options may be risk factors or early symptoms, but they do not carry the same combination of immediate danger and specificity as visual changes.
Memory Tip: When remembering the symptoms of digoxin toxicity, think of the acronym "Digoxin Toxicity Signs." The side effects of Digoxin Typically start with "SEEing yellow halos." This emphasizes that visual symptoms are the most specific and dangerous prodromal sign.
KR vs US
While education on digoxin toxicity symptoms is similar in Korea, the criteria for what to immediately report (Notify HCP!) are applied very clearly and strictly in NGN/US exams. Greater weight is placed on "objective and specific life-threatening signs" rather than "patient discomfort." Additionally, the US heavily emphasizes that electrolyte imbalances (especially hypokalemia) promote digoxin toxicity, with systematic education and monitoring in place to prevent it.
임상 시나리오
Clinical Practice Guide
When managing patients receiving digoxin, check the following:
1. Check Heart Rate (Apical Pulse): Measure the heart rate for 1 minute before administration. If the adult heart rate is less than 60 beats/min or greater than 100 beats/min, withhold the dose and report to the physician.
2. Electrolyte Monitoring: Especially hypokalemia (K+ < 3.5 mEq/L) dramatically increases the risk of digoxin toxicity. Carefully monitor potassium levels.
3. Renal Function Assessment: Since digoxin is excreted through the kidneys, patients with impaired renal function (including the elderly) are at higher risk for toxicity.
4. Patient Education: Educate patients to immediately report symptoms such as yellow/green vision, blurred vision, nausea, anorexia, fatigue, and confusion.
Caution
Be careful of traps in SATA (Select All That Apply) questions. For a question like "What are possible signs of digoxin toxicity?", multiple answers such as bradycardia, nausea, visual disturbances, and hypokalemia may be correct. However, in priority questions like this one that ask for the "most important and immediately reportable" finding, you must choose the single option with the highest specificity and immediate risk. Bradycardia (HR 58) may meet the criteria for withholding the dose, but regular bradycardia alone may require observation rather than posing an immediate life threat.
핵심 개념
Digoxin Toxicity — Digoxin toxicity. A condition that occurs when the blood digoxin concentration exceeds the therapeutic range, which can cause life-threatening arrhythmias. Symptoms include visual disturbances (xanthopsia), nausea, bradycardia, and arrhythmias.
Xanthopsia — Xanthopsia. A visual disturbance where one sees a yellow or green halo around lights. It is one of the very characteristic and specific signs of digoxin toxicity.
Hypokalemia — Hypokalemia. A condition where serum potassium levels fall below normal (3.5-5.0 mEq/L). It reduces the stability of myocardial cell membranes, significantly increasing digoxin toxicity.
Cardiac Glycoside — Cardiac glycosides. This is the drug class to which digoxin belongs, which increases myocardial contractility (positive inotropic effect) and decreases conduction velocity through the atrioventricular node, thereby lowering heart rate (negative chronotropic effect). It has a narrow therapeutic window, so the risk of toxicity is high.
Bradycardia — Bradycardia. In adults, a resting heart rate of less than 60 beats per minute. It commonly occurs as a side effect of digoxin, emphasizing the importance of checking the heart rate before administration.