A nurse is assessing a client who has been experiencing freq… | 마이메르시 MyMerci
Adult Health
문제

A nurse is assessing a client who has been experiencing frequent infections over the past 6 months. Which assessment finding would most likely indicate compromised immune function?

해설
A WBC count of 3,200/mm³ indicates leukopenia, directly reflecting compromised immune function and explaining frequent infections. Other options (Hb, BP, HR) are normal findings not specific to immune status.

심화 해설

Core Nursing Explanation Key Concept Analysis: This question assesses your ability to link a patient's clinical presentation (frequent infections) with laboratory data indicative of immunosuppression. The core concept is understanding that White Blood Cells (WBCs), or leukocytes, are the primary cellular components of the immune system responsible for fighting infection. A low WBC count, known as leukopenia, directly compromises the body's ability to mount an effective immune response.

Answer Rationale: The correct answer is a White blood cell count of 3,200/mm³. The normal adult WBC range is typically 4,500-11,000/mm³. A value of 3,200/mm³ is significantly below this range, confirming leukopenia. This finding provides the most direct and objective laboratory evidence for why the client is experiencing frequent infections. Key Point! In nursing assessment, when a patient presents with a history of recurrent infections, evaluating the WBC count is a priority diagnostic indicator of immune system competence.

Distractor Analysis:
Watch out for confusion! A Hemoglobin level of 12.5 g/dL is within the normal range for an adult female (approx. 12-16 g/dL) and for an adult male (approx. 13.5-17.5 g/dL). While low hemoglobin (anemia) can cause fatigue and general weakness, it is not a primary indicator of immune function.
• A Blood pressure of 130/85 mmHg is classified as an elevated blood pressure (per current guidelines) but is not directly linked to immune function. It relates to cardiovascular risk, not infection susceptibility.
• A Heart rate of 88 beats per minute is within the normal range of 60-100 bpm. While tachycardia can occur with infection (as part of the systemic inflammatory response), a normal resting heart rate does not assess the *cause* of frequent infections.

Related Concepts: Beyond the total WBC count, a differential count (breaking down the percentages of neutrophils, lymphocytes, monocytes, eosinophils, and basophils) provides more specific information. For example, neutropenia (low neutrophil count) is a particularly critical form of leukopenia that dramatically increases the risk for bacterial infections. Assessment of a patient with leukopenia must also include monitoring for signs of active infection (fever, chills, localized redness/swelling) and implementing protective isolation (neutropenic precautions) if severe. Concept SummaryLeukopenia: A decreased total white blood cell count (< 4,500/mm³), indicating a weakened immune defense. • Clinical Correlation: Patients with leukopenia are at high risk for recurrent and severe infections. • Nursing Priority: In patients with frequent infections, assessing the WBC count is a fundamental and critical laboratory test. • Normal Ranges: Know key lab values: WBC (4,500-11,000/mm³), Hemoglobin (Female: 12-16 g/dL, Male: 13.5-17.5 g/dL). Side-by-Side Comparison!
Lab FindingTermPrimary ImplicationCommon Causes/Associations
WBC < 4,500/mm³LeukopeniaCompromised immune function, high infection riskChemotherapy, bone marrow suppression, autoimmune diseases, severe infections (e.g., sepsis)
WBC > 11,000/mm³LeukocytosisOften indicates active infection, inflammation, or stress responseBacterial infection, inflammation, leukemia, physical/emotional stress
Neutrophils < 1,500/mm³Neutropenia (a type of leukopenia)Extremely high risk for bacterial infections; requires neutropenic precautionsChemotherapy, aplastic anemia, certain medications
Anatomy, Physiology & Pharmacology PointsPhysiology: White blood cells are produced in the bone marrow. They circulate in the blood and migrate into tissues to fight pathogens (bacteria, viruses, fungi). • Pathophysiology: Anything that damages bone marrow (chemotherapy drugs, radiation, certain toxins) or accelerates WBC destruction (autoimmune disorders) can cause leukopenia. • Pharmacology: Many chemotherapeutic agents and some antibiotics (e.g., trimethoprim-sulfamethoxazole) can cause bone marrow suppression, leading to leukopenia as a major side effect. Nurses must monitor CBC (Complete Blood Count) regularly for patients on these medications. Memory TipsAcronym: Think "**L**ow **W**BC = **L**ess **W**arriors to fight infection." Warriors = White blood cells. • Number Association: Remember the lower limit of normal WBC is about 4.5 (thousand). Anything significantly below that (like 3.2) is a red flag for a weak immune system. • Clinical Link: When you see "frequent infections" in a question, your mind should immediately go to "check the WBC count." High-Frequency NCLEX Topics This is a Core topic. The NCLEX-RN frequently tests: 1. Interpretation of basic lab values (especially CBC) in the context of patient symptoms. 2. Identifying patients at risk for infection based on assessment data (like lab results). 3. Prioritizing care for immunocompromised patients (e.g., which finding requires immediate intervention?). Watch Out for Question Variations! • Instead of asking for the indicative finding, the question could ask: "The nurse reviews the lab results for a client with frequent infections. Which result requires the nurse to initiate neutropenic precautions?" (Answer: A neutrophil count of 500/mm³). • It could be combined with medication side effects: "A client on chemotherapy reports frequent fevers. Which lab value is most important for the nurse to assess?" (Answer: White blood cell count). • It could test application: "For a client with a WBC of 2,800/mm³, which nursing intervention is the priority?" (Answer: Implementing protective isolation/infection control measures).

임상 시나리오

Nursing Clinical Practice Guide Clinical Scenario: You are a nurse on an oncology unit. Your patient, Mr. Jones, is on day 10 post-chemotherapy for lymphoma. He mentions he's had a "tickle in his throat" for two days and now feels warm. You recall he has a history of frequent infections during past cycles.

Nursing Intervention Strategy: 1. Assessment: Immediately obtain vital signs, paying close attention to temperature. A fever (often defined as >100.4°F or 38°C) in a neutropenic patient is a medical emergency. Assess the throat for redness, exudate, and listen to lung sounds. Review the most recent CBC, focusing on the WBC and Absolute Neutrophil Count (ANC). 2. Planning & Implementation: If fever is present or the WBC/ANC is critically low, your priority actions are: • Notify the physician/provider immediately. • Obtain cultures as ordered (blood, urine, sputum) before administering antibiotics if possible. • Initiate or reinforce neutropenic precautions: private room if possible, strict hand hygiene for everyone, no fresh flowers/plants, no raw fruits/vegetables in the diet, avoiding crowded places. • Administer prescribed antipyretics and antibiotics promptly. 3. Patient Education and Evaluation: Educate the patient and family on signs of infection to report immediately (fever, chills, cough, sore throat, burning with urination). Evaluate the effectiveness of interventions by monitoring temperature trends and repeat lab values.

Patient Safety and Precautions: • Key Point! Do not administer live vaccines to immunocompromised patients or their household contacts. • For patients with severe leukopenia/neutropenia, avoid rectal temperatures and intramuscular injections to prevent introducing bacteria or causing bleeding/infection at the site. • Meticulous oral and perineal care is essential to prevent breakdown of these common portals for infection. Nursing Procedure & Medication Flow When Administering Myelosuppressive Drugs (Chemotherapy): • Always verify the most recent CBC (especially WBC and platelet count) before administration. Many protocols have specific "hold" parameters (e.g., hold if WBC < 3,000/mm³ or ANC < 1,500/mm³). • Teach patients that their WBC nadir (lowest point) typically occurs 7-14 days after treatment, which is their period of highest infection risk. • Educate on the importance of prophylactic medications, such as filgrastim (Neupogen), a colony-stimulating factor that helps boost neutrophil production. A Word from Your Senior Nurse "In the real world, that 'frequent infection' history is a huge red flag waving at you. It's not just a test answer—it's a patient telling you their body's defenses are down. Your job is to connect the dots: their story + your assessment + the lab data. Spotting that low WBC count early can trigger life-saving interventions like isolation and antibiotics before a simple fever turns into sepsis. On the NCLEX and at the bedside, think like a detective. The lab values are your clues, and the patient's symptoms are the case you need to solve."

핵심 개념

  • Leukopenia — A condition characterized by an abnormally low number of white blood cells (WBCs) in the blood, typically defined as a count less than 4,500/mm³. It indicates compromised immune function and increases infection risk.
  • Neutropenic Precautions — A set of infection control practices (e.g., private room, strict hand hygiene, no fresh plants/flowers, a low-bacteria diet) implemented to protect a patient with severe neutropenia (very low neutrophil count) from exposure to pathogens.
  • Absolute Neutrophil Count — A calculated value (Total WBC x (% Segs + % Bands)) that provides a more precise measure of the body's ability to fight bacterial infection. An ANC < 1,500/mm³ indicates neutropenia, and < 500/mm³ indicates severe risk.
  • Immunosuppression — A state in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. It can be caused by disease (like HIV), medications (like chemotherapy or steroids), or radiation.
  • Complete Blood Count — A common blood test that measures the cells circulating in the blood, including red blood cells (RBCs), white blood cells (WBCs), and platelets. It is a fundamental tool for assessing overall health and detecting a wide range of disorders, including anemia, infection, and leukemia.

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