A nurse is preparing a patient for a cardiac catheterization… | 마이메르시 MyMerci
Adult Health
문제

A nurse is preparing a patient for a cardiac catheterization procedure. Which nursing action should be the highest priority before the procedure?

A 65-year-old female patient with a history of diabetes is scheduled for cardiac catheterization to evaluate atypical chest pain.
해설
Verifying allergy history to iodine/shellfish is the priority because contrast dye contains iodine and can cause severe allergic reactions. Other actions like consent or NPO are important but less critical.

심화 해설

Core Nursing Explanation Key Concept Analysis: This question assesses the priority nursing action in the Pre-procedure phase for a patient undergoing Cardiac catheterization. The core principle is Patient Safety, specifically preventing a life-threatening complication. While all listed actions are essential components of pre-procedure care, the nurse must prioritize actions that directly prevent immediate, severe harm.

Answer Rationale: The correct answer is to Key Point! Verify the patient's allergy history, especially to iodine and shellfish. This is the highest priority because cardiac catheterization involves the injection of Iodinated contrast dye. A patient with a history of allergy to iodine or shellfish (which contain high iodine levels) is at significant risk for a severe, potentially fatal Anaphylactic reaction. Identifying this risk before the procedure allows the healthcare team to take preventive measures, such as pre-medicating the patient with corticosteroids and antihistamines, or using a non-iodinated contrast agent. This action directly addresses the ABCs (Airway, Breathing, Circulation) by preventing a catastrophic airway compromise.

Distractor Analysis:
① Obtain informed consent: While legally and ethically mandatory, obtaining consent is a process that should be completed well in advance of the immediate pre-procedure period. The physician is primarily responsible for explaining the procedure and risks; the nurse's role is often to witness the signature and ensure the patient understands. It is critical but does not supersede the immediate safety check for a life-threatening allergy.
② Check the patient's blood pressure and heart rate: This is a standard part of the pre-procedure assessment (vital signs). Abnormal findings are important but are more likely to lead to procedure postponement rather than prevent an imminent, unpredictable anaphylactic event. Baseline vitals are necessary but not the single highest priority.
③ Ensure the patient has been NPO for 8 hours: Maintaining NPO (Nothing by mouth) status is crucial to prevent Aspiration during sedation. However, if this check were missed, the procedure could be safely delayed. In contrast, administering contrast dye to a patient with an unknown severe allergy could cause immediate cardiac arrest.

Related Concepts: This question integrates principles of Invasive procedure nursing, Contrast media safety, and Allergy assessment. It tests the nurse's ability to apply Key Point! Maslow's Hierarchy of Needs and the ABC (Airway, Breathing, Circulation) priority framework. Preventing anaphylaxis addresses physiological safety needs (airway patency), which take precedence over other important but less immediately threatening needs like legal consent (safety/security) or NPO status (physiological but less acute). Concept Summary
ConceptDescriptionNursing Implication
Cardiac CatheterizationInvasive diagnostic procedure to visualize coronary arteries and heart chambers using contrast dye.Pre-procedure: Allergy check, NPO, consent. Post-procedure: Monitor access site, vital signs, distal pulses.
Iodinated Contrast DyeRadiopaque substance containing iodine used to enhance X-ray images.Major risk: Anaphylaxis. Always assess for iodine/shellfish allergy. Pre-medicate if needed.
AnaphylaxisSevere, life-threatening systemic allergic reaction.Symptoms: bronchospasm, laryngeal edema, hypotension. Treatment: Epinephrine, IV fluids, airway support.
Informed ConsentLegal process where a patient is informed of risks/benefits and voluntarily agrees to treatment.Physician's duty to explain. Nurse's role: witness signature, ensure understanding, advocate.
NPO (Nothing by Mouth)Fasting status before procedures requiring sedation.Prevents pulmonary aspiration. Typically 6-8 hours for solids, 2-4 hours for clear liquids.
Side-by-Side Comparison!
Pre-Procedure PriorityRationaleExample Scenario
Highest: Allergy CheckPrevents immediate, life-threatening anaphylaxis (ABC threat).Cardiac cath, CT scan with contrast, IVP.
High: NPO Status VerificationPrevents aspiration during sedation (Airway threat).Any procedure requiring general anesthesia or moderate sedation.
Essential: Informed ConsentLegal/ethical requirement; ensures patient autonomy.All surgical and invasive procedures.
Routine: Baseline Vital SignsProvides data for comparison; identifies instability.Before any procedure or medication administration.
Anatomy, Physiology & Pharmacology Points
  • Pathophysiology Link: Iodine in contrast dye can act as an antigen, triggering a massive IgE-mediated release of histamine and other mediators from mast cells and basophils, leading to vasodilation, capillary leak, bronchoconstriction, and laryngeal edema.
  • Pharmacology: Pre-medication for contrast allergy often includes Diphenhydramine (Benadryl) (H1 antagonist) and Methylprednisolone (Solu-Medrol) (corticosteroid) to suppress the immune response.
  • Shellfish Connection: Shellfish contain a protein called tropomyosin, which can cross-react with iodine in some individuals, making a shellfish allergy a key red flag for potential contrast dye reaction.
Memory Tips
  • Mnemonic: Allergy Before All (A before All): When preparing for a procedure with contrast, checking for Allergy is the priority Before doing All other tasks.
  • Think "ABC": Anaphylaxis threatens Airway first. The action that prevents anaphylaxis (allergy check) protects the ABCs directly.
  • Shellfish = Iodine Alert: Associate shellfish with the ocean (iodine is found in seawater and marine life).
High-Frequency NCLEX Topics The NCLEX-RN frequently tests:
  1. Priority Setting: Questions that ask "which action should the nurse take first" or "what is the priority". Always apply ABCs, Maslow's, and safety-first principles.
  2. Contrast Media Safety: Allergy assessment for iodine/shellfish is a classic, must-know item for any procedure involving radiological contrast.
  3. Informed Consent: Understanding whose responsibility it is (physician explains, nurse witnesses) and when it must be obtained.
Watch Out for Question Variations!
  • Shift from "Priority Before" to "Priority After": The priority after cardiac catheterization is different: monitoring the access site for bleeding or hematoma and checking distal pulses.
  • Change the Procedure: The same principle applies to other contrast studies (e.g., CT scan, IV pyelogram). The allergy check remains paramount.
  • Focus on Patient Teaching: A question might ask, "What is the most important instruction to give a patient before cardiac catheterization?" While NPO is a key instruction, the nurse's priority action is still assessment (allergy verification).

임상 시나리오

Nursing Clinical Practice Guide Clinical Scenario: You are the day-shift nurse for Mrs. Johnson, a 65-year-old with diabetes scheduled for a left heart catheterization at 10:00 AM. You begin your pre-procedure checklist.

Nursing Intervention Strategy:
  1. Assessment (First & Foremost): Immediately review the chart and interview the patient. Ask directly: "Have you ever had a reaction to iodine, contrast dye, or shellfish like shrimp, lobster, or crab? Have you ever had a severe allergic reaction to anything?" Document the response clearly.
  2. If Allergy is Present: Notify the physician and radiology/cath lab team immediately. They will likely order a pre-medication protocol (e.g., prednisone and diphenhydramine 13, 7, and 1 hour before the procedure). Ensure these medications are administered on time.
  3. Proceed with Other Checks: Once the allergy status is confirmed and managed, verify NPO status (typically after midnight for solids, clear fluids until 4-6 AM). Check and document baseline vital signs and peripheral pulses (especially in the limb where access is planned—often the right groin for femoral approach).
  4. Informed Consent: Confirm that the consent form is in the chart, properly signed and witnessed. Provide reinforcement teaching: "The doctor will explain the pictures of your heart arteries. You'll be awake but sedated. You'll feel pressure but not pain when the catheter goes in."
Patient Safety and Precautions:
  • Contraindication: An undocumented severe iodine allergy is a contraindication for proceeding with standard contrast dye. The team must be aware.
  • Medication Caution: For diabetic patients, manage NPO status carefully. Hold morning oral hypoglycemics or reduce insulin doses as per protocol to prevent hypoglycemia. Monitor blood glucose.
  • Key Monitoring Point: Even with a negative allergy history, anaphylaxis can occur. Ensure emergency equipment (crash cart with epinephrine, airway supplies) is immediately available in the procedure area.
Nursing Procedure & Medication Flow Pre-Cardiac Catheterization Nursing Checklist:
  1. ✅ Verify allergy history (Iodine/Shellfish/Contrast).
  2. ✅ Notify MD of any allergies; administer pre-meds if ordered.
  3. ✅ Confirm NPO status (Solids: 8 hrs, Clear liquids: 2-4 hrs per facility policy).
  4. ✅ Obtain/document baseline vital signs, pulses, and neurovascular assessment of access limb.
  5. ✅ Ensure informed consent is on chart and patient verbalizes understanding.
  6. ✅ Administer pre-procedure medications (e.g., mild sedative) as ordered.
  7. ✅ Instruct patient to void before transport to cath lab.
A Word from Your Senior Nurse "In the fast-paced world of procedural nursing, it's easy to get caught up in the checklist. But remember, your most powerful tool is your assessment. That one question—'Are you allergic to shellfish or iodine?'—isn't just a box to tick. It's a literal lifesaver. I've seen a patient develop hives and stridor within minutes of contrast injection because someone didn't ask. Your vigilance in that moment defines safe nursing. For the NCLEX, they are testing if you understand that safety assessment trumps all other important tasks. Carry that mindset to the bedside: always look for the thing that could hurt your patient first. That's what makes a great nurse."

핵심 개념

  • Cardiac Catheterization — An invasive diagnostic procedure where a catheter is threaded into the heart chambers or coronary arteries, often using contrast dye, to assess heart function, pressures, and blockages.
  • Iodinated Contrast Dye — A radiocontrast agent containing iodine that is injected during imaging studies to make blood vessels and organs more visible on X-ray or CT scan. A known allergen for some patients.
  • Anaphylaxis — A severe, life-threatening allergic reaction characterized by bronchospasm, laryngeal edema, hypotension, and urticaria. It is a medical emergency requiring immediate epinephrine.
  • Informed Consent — The process by which a patient is informed of the risks, benefits, and alternatives of a procedure and voluntarily gives permission. The physician explains; the nurse often witnesses.
  • NPO (Nothing by Mouth) — A medical instruction for a patient to refrain from eating or drinking for a specified period before a procedure or surgery to reduce the risk of pulmonary aspiration.

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