A 6-month-old infant with congenital heart failure is admitted to the pediatric unit. The infant is receiving digoxin 0.025 mg PO daily and furosemide 10 mg PO twice daily. During the morning assessment, the nurse notes the infant is lethargic, has vomiting, and the apical heart rate is 92 beats per minute. What is the nurse's priority action?

Digoxin toxicity in infants presents with bradycardia (HR 92 bpm is below normal 110-160 bpm), lethargy, and vomiting. The priority is to hold digoxin and notify the provider to prevent life-threatening arrhythmias. Other options (administering digoxin, increasing monitoring, feeding) do not address the acute toxicity.

Core Nursing Explanation Key Concept Analysis: This question tests the nurse's ability to recognize and prioritize care for Digoxin toxicity in an infant. The infant has congenital heart failure and is on two key medications: digoxin (a positive inotrope) and furosemide (a loop diuretic). Furosemide can cause potassium loss, and Key Point! hypokalemia is a major risk factor for digoxin toxicity, even at therapeutic digoxin levels. The symptoms presented—lethargy, vomiting, and a heart rate of 92 bpm—are classic signs of digoxin toxicity in an infant. A normal heart rate for a 6-month-old is 110-160 bpm, so 92 bpm represents significant bradycardia. Answer Rationale: The nurse's priority action is to Hold the digoxin dose and notify the healthcare provider. This is the immediate, life-saving intervention. Administering another dose could lead to fatal arrhythmias. The nurse must first stop the source of the problem (the medication) and then communicate with the provider for further orders, which may include checking serum digoxin and electrolyte levels (especially potassium). Distractor Analysis: Watch out for confusion! Option ② (Administer the scheduled dose) is dangerous and contraindicated when signs of toxicity are present. Option ③ (Increase monitoring frequency) is an appropriate concurrent action but is not the priority first step; you must act to stop the potential harm before intensifying observation. Option ④ (Encourage more frequent feeding) is incorrect. While nutrition is important, vomiting and lethargy are signs of a serious medication-related problem, not simply a feeding issue. Forcing feeds could also increase the risk of aspiration. Related Concepts: This scenario integrates knowledge of pediatric vital signs, pharmacology (digoxin action/toxicity), and the electrolyte imbalances caused by diuretics. The nursing process is applied: Assessment (noting bradycardia, lethargy, vomiting) leads to the Nursing Diagnosis of risk for decreased cardiac output related to medication toxicity. The Planning/Implementation priority is to ensure patient safety by withholding the drug and notifying the provider.
Concept Summary * Digoxin Toxicity Signs (Infants/Children): Bradycardia, lethargy, poor feeding, vomiting, arrhythmias. * Major Risk Factors: Hypokalemia (from diuretics like furosemide), renal impairment, overdose. * Normal Infant (6-month) Heart Rate: 110-160 bpm. * Nursing Priority for Suspected Toxicity: 1. Hold the dose. 2. Notify provider. 3. Monitor closely (cardiac monitor, vital signs). 4. Prepare for lab tests (digoxin level, electrolytes).
Side-by-Side Comparison!

Assessment	Possible Cause in CHF Infant	Nursing Consideration
Bradycardia, Vomiting, Lethargy	Digoxin Toxicity (High Priority)	Hold digoxin, notify provider, check electrolytes.
Tachypnea, Tachycardia, Sweating with Feeds	Worsening Heart Failure	Elevate HOB, administer O2, diuretics as ordered, conserve energy.
Poor Feeding, Fussiness	General illness or fatigue from CHF	Offer small, frequent feeds; allow rest periods.

Anatomy, Physiology & Pharmacology Points * Digoxin Mechanism: Inhibits the Na+/K+ ATPase pump, leading to increased intracellular calcium, which strengthens myocardial contraction (positive inotrope) and slows conduction through the AV node (negative dromotrope). Toxicity disrupts this electrical activity, causing arrhythmias. * Potassium Connection: Hypokalemia makes the heart muscle more sensitive to digoxin, lowering the threshold for toxicity. Always monitor potassium levels in patients on digoxin and diuretics. * Infant Physiology: Infants have higher metabolic rates and less renal reserve, affecting drug metabolism and excretion, making them more susceptible to medication side effects.
Memory Tips * Mnemonic for Digoxin Toxicity: "Bradycardia, Anorexia, Nausea/Vomiting, Drowsiness/Confusion" (Think: you feel BAN(D) after a toxic dose). * Rule of Thumb: For any patient on digoxin presenting with GI symptoms (nausea/vomiting) AND a change in heart rate (especially bradycardia), THINK TOXICITY FIRST.
High-Frequency NCLEX Topics NCLEX loves to test medication safety, especially "what to do first" when a side effect or toxicity is suspected. Digoxin toxicity is a classic. Remember the sequence: Assess → Hold the drug if unsafe → Notify → Monitor/Implement new orders. Knowing normal pediatric vital sign ranges is also essential.
Watch Out for Question Variations! * Instead of asking for the priority action, a question might ask: "Which lab value is most important to check?" (Answer: Serum potassium level). * Or, it could present with different symptoms: "The infant is irritable and has a heart rate of 190 bpm." This suggests tachycardia, which could indicate worsening heart failure or a different type of digoxin toxicity arrhythmia (like supraventricular tachycardia), but the core action remains similar: assess, hold digoxin, notify. * A question might test if you know the antidote for severe digoxin toxicity: Digoxin Immune Fab (Digibind).

Nursing Clinical Practice Guide Clinical Scenario: You are the nurse on a pediatric cardiology unit. Your patient, Baby Mia, is 6 months old with a ventricular septal defect (VSD) and heart failure. She is on daily digoxin and twice-daily furosemide. During your morning assessment, you find her unusually sleepy, she vomited her last feed, and her apical pulse is 94 bpm (yesterday it was 130 bpm). Nursing Intervention Strategy: 1. Immediate Action (Safety First): Withhold the scheduled morning digoxin dose. Document "Digoxin held due to bradycardia (HR 94) and vomiting. Provider notified." 2. Communication: Notify the pediatric cardiologist or covering provider immediately. Report using SBAR: Situation (infant with bradycardia and vomiting), Background (CHF on digoxin and Lasix), Assessment (HR 94, lethargic, vomited), Recommendation (request orders for digoxin level, electrolytes, ECG). 3. Ongoing Monitoring: Place the infant on a cardiac monitor. Check vital signs (especially apical pulse for a full minute) every 15-30 minutes as per unit protocol. Assess for other arrhythmias. 4. Supportive Care: Keep the infant NPO (nothing by mouth) until vomiting is assessed, elevate the head of the bed, provide comfort. Do not attempt to feed. 5. Follow-up: Once labs are drawn, administer any new orders (e.g., potassium supplementation if hypokalemic). Patient Safety and Precautions: * Always check the apical pulse for a full minute before administering digoxin. The specific hold parameter (e.g., HR < 100 bpm for an infant) should be in the order or hospital policy. * Teach parents to watch for signs of toxicity at home: poor feeding, vomiting, listlessness. They should know to call the clinic for these symptoms, not just give the next dose. * Diuretics like furosemide increase the risk of dehydration and electrolyte imbalance. Monitor intake/output and weight daily.
Nursing Procedure & Medication Flow Administering Digoxin to an Infant: 1. Verify the order and perform the Seven Rights of medication administration. 2. Key Step: Obtain an apical pulse for 1 full minute prior to administration. 3. Hold Criteria: If the heart rate is below the specified limit (often < 100-110 bpm for infants) OR if new signs of toxicity appear (vomiting, lethargy). 4. Use a calibrated oral syringe for the precise dose. Digoxin elixir is often used for infants. 5. Observe the infant for a few minutes after administration to ensure the medication is not spit up.
A Word from Your Senior Nurse "In pediatrics, our patients can't always tell us what's wrong. We have to be expert detectives, connecting subtle clues like a slow heart rate and vomiting to their medication regimen. Catching digoxin toxicity early can literally save a child's life. On the NCLEX and in practice, never ignore a change in vital signs, especially when it involves high-alert medications like digoxin. Your vigilance is the first line of defense. Remember: When in doubt about a drug's safety, hold it and call. It's always better to be safe than sorry."