A 55-year-old patient with hypertension, chronic obstructive pulmonary disease (COPD), and liver cirrhosis is admitted. What is the nurse's priority action?

Metformin should be held due to chronic kidney disease (CKD) stage 3, indicating kidney impairment risk for lactic acidosis. Other options address glucose or fluid but ignore this immediate safety concern.

Core Nursing Explanation This question integrates knowledge of medication safety, chronic disease management, and nursing clinical judgment to identify the priority action for a complex patient. Key Concept Analysis The core theme is recognizing a Key Point! life-threatening medication contraindication. The patient has multiple chronic conditions. While the symptoms (fatigue, orthopnea, edema, low O2 saturation) suggest complications like heart failure or COPD exacerbation, the critical data point is the eGFR 45 mL/min/1.73m². This places the patient in Chronic Kidney Disease (CKD) Stage 3b. Metformin, a common antidiabetic drug, carries a Black Box Warning for the risk of lactic acidosis in patients with renal impairment. The nurse's primary role is to protect the patient from harm by withholding an unsafe medication and notifying the prescriber. Answer Rationale Key Point! Option ② is correct because it directly addresses the most immediate patient safety risk. The eGFR of 45 is a clear contraindication for continuing metformin per standard guidelines (typically contraindicated when eGFR < 30, and use requires caution/dose adjustment when eGFR < 45). Administering it could precipitate lactic acidosis, a rare but fatal complication. The action of "hold and notify" is the fundamental nursing responsibility for medication safety. Distractor Analysis Watch out for confusion! • Option ① (Administer metformin): This is dangerous and ignores the critical lab value indicating renal impairment. • Option ③ (Increase furosemide dose): While the patient has edema and possible fluid overload, independently adjusting a medication dose is outside the nurse's scope of practice. Furthermore, it does not address the urgent safety issue with metformin. • Option ④ (Encourage increased fluid intake): This is contraindicated given the patient's 3+ pitting edema and potential for fluid overload or hyponatremia. It would worsen the clinical situation. Related Concepts This scenario tests the ability to triage concerns. The patient has multiple problems (hypertension, COPD, cirrhosis, edema, hypoxia), but the new, actionable, and high-risk data is the lab value contraindicating a current medication. This aligns with the safety principle of "Do No Harm."
Concept Summary • Metformin Contraindication: eGFR < 30 (absolute), use with caution if eGFR 30-45. Risk of lactic acidosis. • Lactic Acidosis: Metabolic acidosis with elevated lactate; symptoms include malaise, myalgia, respiratory distress, hypotension. • Nursing Priority: Patient safety (e.g., holding unsafe meds) precedes other interventions like symptom management. • CKD Staging: Based on eGFR. Stage 3a (45-59), Stage 3b (30-44).
Side-by-Side Comparison!

Concern	Immediate Priority (Requires Action NOW)	Important but Can Be Addressed Next
Medication Contraindication	HOLD the drug & notify provider (e.g., Metformin with low eGFR)	Discussing alternative antidiabetic therapy
Patient Symptom (e.g., Edema, Dyspnea)	Assess ABCs (Airway, Breathing, Circulation), apply O2, position for comfort	Administering already prescribed and safe diuretics, detailed respiratory assessment

Anatomy, Physiology & Pharmacology Points • Kidney (Renal) Function: The kidneys clear metformin. Impaired function (low eGFR) leads to drug accumulation. • Lactic Acidosis Pathophysiology: Metformin can impair hepatic metabolism of lactate, especially during hypoperfusion or renal failure, leading to a dangerous drop in blood pH. • eGFR vs. Serum Creatinine: eGFR is a more accurate measure of kidney function as it accounts for age, sex, and body size.
Memory Tips • Mnemonic for Metformin Hold: "Metformin + Malfunctioning Kidneys = Major Risk." Think "30/45 Rule": Be very cautious below 45, contraindicated below 30. • Think of the Nursing Process: Assessment (see the lab value) → Analysis (recognize the risk) → Planning/Implementation (hold drug, notify) → Evaluation (ensure provider is aware, monitor patient).
High-Frequency NCLEX Topics NCLEX heavily tests medication safety and contraindications. You must know key drugs with Black Box Warnings (like metformin, warfarin, chemotherapeutics). Questions often present a lab value that should trigger you to hold a medication. The correct answer is almost always the action that prevents immediate harm.
Watch Out for Question Variations! • Instead of eGFR, they might give serum creatinine 2.5 mg/dL (elevated). • The unsafe drug could change: e.g., "Hold naproxen in a patient with CKD" or "Hold enoxaparin in a patient with a platelet count of 80,000/mm³." • The question could ask for the rationale: "The nurse holds metformin due to the risk of which complication?"

Nursing Clinical Practice Guide Clinical Scenario You are the nurse on a medical-surgical unit. Mr. Johnson, 55, is admitted with worsening fatigue and edema. His history includes Type 2 DM, HTN, COPD, and cirrhosis. During your morning assessment and chart review, you note his latest BMP (Basic Metabolic Panel) shows the eGFR of 45. His medication administration record (MAR) lists "Metformin 1000 mg PO twice daily" for 0900. Nursing Intervention Strategy 1. Assessment & Recognition: Correlate the lab data (eGFR) with the scheduled medication. Recognize the contraindication. Simultaneously, perform a focused assessment: lung sounds (crackles?), respiratory effort, O2 saturation, and degree of edema. 2. Immediate Action: DO NOT ADMINISTER the metformin dose. Place the medication on "hold" in the MAR per facility protocol. 3. Communication: Notify the prescribing healthcare provider (HCP) immediately. Use SBAR (Situation, Background, Assessment, Recommendation): • S: "I'm calling about Mr. Johnson in room 402. His scheduled 0900 metformin is due, but his morning labs show an eGFR of 45." • B: "He has a history of DM, HTN, COPD, and cirrhosis. He was admitted for increased fatigue and edema." • A: "Vitals are BP 150/90, HR 95, RR 24, SpO2 88% on RA. He has 3+ bilateral pitting edema. He reports orthopnea." • R: "I have held the metformin due to the renal function. I recommend we discuss an alternative for his glucose management and evaluate his volume status." 4. Documentation: Document accurately: "0900: Metformin 1000 mg held per protocol due to eGFR 45 mL/min/1.73m² (CKD Stage 3b). HCP Dr. Smith notified at 0910. Orders pending. Patient monitored for respiratory distress and glucose levels." 5. Concurrent Care: While addressing the medication issue, also implement orders for the patient's other needs: apply supplemental oxygen per order to maintain SpO2 >92%, assist into High-Fowler's position to ease breathing, and monitor I&Os (Intake and Output). Patient Safety and Precautions • Key Point! Never administer a medication when a known, serious contraindication exists. The nurse has both a legal and ethical duty. • Monitor for signs of lactic acidosis if the patient has recently taken metformin: unexplained hyperventilation, myalgia, malaise, abdominal pain. • Be aware that contrast dye for imaging studies is also a risk for nephrotoxicity in patients with reduced eGFR. This requires coordination and possibly holding metformin before and after the procedure.
Nursing Procedure & Medication Flow Step-by-Step: Responding to a Lab Contraindication 1. Verify the lab result and the patient's identity. 2. Check the drug reference or facility protocol for the specific contraindication criteria (e.g., "hold metformin if eGFR < 45"). 3. Withhold the medication. Do not leave it at the bedside. 4. Notify the HCP promptly—delaying communication can delay essential treatment changes. 5. Re-check blood glucose levels as ordered, as holding an antidiabetic may affect control. 6. Educate the patient: "Mr. Johnson, your lab work today shows your kidneys aren't working as well as we'd like, so we are holding one of your diabetes medicines for now because it could cause side effects. The doctor will decide on a different plan. We'll check your blood sugar regularly."
A Word from Your Senior Nurse "In the real world, you are the last safety checkpoint before a medication reaches your patient. A lab value like this is a giant red flag waving at you. It's easy to get distracted by the loud problems—the edema, the shortness of breath—but the silent, numerical danger in the chart can be just as deadly. Developing the habit of correlating labs with your MAR for every patient, every shift is non-negotiable. On the NCLEX, they are testing this exact safety mindset. Look for the outlier, the mismatch, the hidden risk. That's what makes a safe nurse."