# A nurse is caring for a patient with acute leukemia who suddenly develops severe shortness of breath, chest pain, and anxiety. The patient appears pale and diaphoretic with visible petechiae on the arms and legs, and reports feeling "like I can't catch my breath" with chest pain rated 8/10. Vital signs: temperature 101.2°F (38.4°C), heart rate 128 bpm, respiratory rate 32/min, blood pressure 88/52 mmHg, and oxygen saturation 89% on room air. Laboratory results show: WBC 2,100/μL, hemoglobin 7.2 g/dL, platelets 18,000/μL. What is the nurse's priority action? > source: MyMerci (mymerci.kr) > url: https://mymerci.kr/pages/nclex_q.php?qn_id=540766 > language: ko > subject: Adult Health ## 문제 A nurse is caring for a patient with acute leukemia who suddenly develops severe shortness of breath, chest pain, and anxiety. The patient appears pale and diaphoretic with visible petechiae on the arms and legs, and reports feeling "like I can't catch my breath" with chest pain rated 8/10. Vital signs: temperature 101.2°F (38.4°C), heart rate 128 bpm, respiratory rate 32/min, blood pressure 88/52 mmHg, and oxygen saturation 89% on room air. Laboratory results show: WBC 2,100/μL, hemoglobin 7.2 g/dL, platelets 18,000/μL. What is the nurse's priority action? The patient appears pale and diaphoretic with visible petechiae on the arms and legs. The patient reports feeling "like I can't catch my breath" and rates chest pain as 8/10. ## 보기 1. Administer prescribed antibiotics immediately 2. Prepare for platelet transfusion 3. Apply oxygen and prepare for emergency intubation **✔ 정답** 4. Obtain blood cultures before starting treatment **정답: 3** ## 해설 The patient's severe dyspnea, hypoxia (SpO2 89%), and vital signs indicate impending respiratory failure, requiring immediate oxygen and preparation for intubation per ABC priorities. Other interventions are important but secondary to airway and breathing support. ## 심화 해설 Clinical Presentation Analysis The patient with acute leukemia presents with sudden-onset severe dyspnea, chest pain (8/10), anxiety, pallor, diaphoresis, and visible petechiae. Vital signs reveal fever (101.2°F / 38.4°C), tachycardia (128 bpm), tachypnea (32/min), hypotension (88/52 mmHg), and critically low oxygen saturation (89% on room air). Laboratory findings demonstrate pancytopenia with severe thrombocytopenia (platelets 18,000/μL) and anemia (hemoglobin 7.2 g/dL). This constellation of fever, respiratory distress with pulmonary infiltrates, hypotension, and organ dysfunction in a patient with acute leukemia receiving differentiation therapy is highly suggestive of differentiation syndrome (DS), a life-threatening complication that can rapidly progress to respiratory failure and death if not recognized and managed emergently [2]. Pathophysiology of Differentiation Syndrome Differentiation syndrome occurs when differentiation agents, such as all-trans retinoic acid (ATRA) or arsenic trioxide (ATO), trigger rapid maturation of leukemic blasts. This sudden differentiation releases proinflammatory cytokines, causing a systemic inflammatory response characterized by increased capillary permeability, endothelial damage, and tissue infiltration by differentiating myeloid cells [2]. The resulting capillary leak syndrome leads to pulmonary edema, pleural and pericardial effusions, hypotension, and acute respiratory distress. Fever results from cytokine release, while the pulmonary infiltrates and hypoxemia reflect alveolar-capillary membrane damage and fluid extravasation into the interstitial and alveolar spaces. The clinical picture often mimics sepsis or infection, but the underlying mechanism is a sterile inflammatory process driven by leukemic cell differentiation rather than an infectious etiology [2]. Priority Action Rationale The nurse's priority action is to apply oxygen and prepare for emergency intubation. This patient demonstrates imminent respiratory failure with oxygen saturation of 89% on room air, severe tachypnea (32/min), and subjective report of air hunger ("like I can't catch my breath"). In differentiation syndrome, pulmonary complications including infiltrates, effusions, and acute respiratory distress syndrome can progress rapidly, necessitating immediate airway protection and ventilatory support [2]. The Airway-Breathing-Circulation (ABC) framework dictates that securing oxygenation and ventilation takes precedence over other interventions. Without adequate oxygenation, irreversible hypoxic organ damage occurs within minutes. The hypotension (88/52 mmHg) further compromises tissue oxygen delivery, making respiratory stabilization even more urgent. Analysis of Alternative Options Administering prescribed antibiotics immediately (Option 1) addresses potential infection, which is a reasonable concern given the fever and neutropenia (WBC 2,100/μL). However, in differentiation syndrome, the fever and clinical deterioration stem from cytokine release rather than infection [2]. While broad-spectrum antibiotics are often initiated concurrently, they do not address the immediate threat of respiratory failure. Preparing for platelet transfusion (Option 2) targets the severe thrombocytopenia (18,000/μL) and petechiae, which indicate bleeding risk. Although hemorrhage is a concern in acute leukemia, particularly in subtypes like acute promyelocytic leukemia with associated coagulopathy , the patient's immediate life threat is hypoxemic respiratory failure, not active hemorrhage. Platelet transfusion can follow after respiratory stabilization. Obtaining blood cultures before starting treatment (Option 4) is standard practice in febrile neutropenia to guide antimicrobial therapy, but it delays critical interventions for respiratory failure. Cultures can be drawn after oxygen is applied and airway equipment is prepared, without compromising diagnostic yield. Clinical Recognition and Nursing Implications Early recognition of differentiation syndrome in the emergency department or inpatient setting is critical to mitigate morbidity and mortality [2]. The hallmark features include fever, pulmonary infiltrates, pleural or pericardial effusions, hypotension, and organ dysfunction occurring during differentiation therapy for hematologic malignancies. Nurses must maintain a high index of suspicion when patients receiving ATRA or ATO develop unexplained respiratory distress or hemodynamic instability. Management requires immediate respiratory support, often including supplemental oxygen, non-invasive ventilation, or mechanical ventilation, along with hemodynamic support and administration of corticosteroids such as dexamethasone to blunt the inflammatory cascade. Temporary discontinuation of the differentiating agent may be necessary in severe cases. The nurse's role includes continuous monitoring of oxygen saturation, respiratory effort, and hemodynamic parameters, ensuring emergency airway equipment is readily available, and promptly communicating changes in clinical status to the healthcare team.References (research sources) - [2]Identification and Management of Differentiation Syndrome in Emergency Settings: A Narrative Review.Research articleChang GA, Bey T, Stroh J, Qdaisat A, Yeung SJ. (2026) · DOI: 10.3390/cancers18111798 ## 임상 시나리오 Differentiation Syndrome in Acute LeukemiaRecognizing and Managing a Life-Threatening Oncologic Emergency Suspect differentiation syndrome in any patient on ATRA or arsenic trioxide who develops acute respiratory distress, fever, and hypotension. The hallmark is a capillary leak causing pulmonary edema and effusions. The immediate priority is to secure airway and oxygenation. Apply high-flow oxygen and prepare for emergency intubation if the patient has refractory hypoxemia (SpO2 < 90%) or severe work of breathing. CautionDo not delay respiratory support for other interventions like antibiotics or transfusions. Hypoxia and airway compromise are the most immediate threats to life. Hold the causative agent and notify the provider immediately. ## 핵심 개념 - **Differentiation Syndrome** — A life-threatening complication of acute leukemia treatment (e.g., ATRA, arsenic trioxide) causing systemic inflammation, capillary leak, and respiratory distress. - **Capillary Leak Syndrome** — Increased capillary permeability leading to fluid extravasation, pulmonary edema, and hypotension, often seen in differentiation syndrome. - **Pancytopenia** — Deficiency of all three blood cell lines (red cells, white cells, platelets), common in acute leukemia. - **Priority Action (ABC)** — In emergency nursing, the airway, breathing, and circulation are prioritized; severe hypoxemia requires immediate oxygen and airway support. - **Petechiae** — Pinpoint, non-blanching red or purple spots on the skin caused by minor hemorrhage, often indicating severe thrombocytopenia. ## 같은 주제 문제 - [A nurse is assessing a 45-year-old patient with acute lymphoblastic leukemia who was admit…](https://mymerci.kr/pages/nclex_q.php?qn_id=540756) - [A nurse is caring for a patient with acute lymphoblastic leukemia who suddenly develops se…](https://mymerci.kr/pages/nclex_q.php?qn_id=540757) - [A nurse is assessing a 58-year-old patient with acute myeloid leukemia who has been receiv…](https://mymerci.kr/pages/nclex_q.php?qn_id=540758) - [A nurse is caring for a patient with acute lymphoblastic leukemia who develops tumor lysis…](https://mymerci.kr/pages/nclex_q.php?qn_id=540759) - [A nurse is caring for a patient with acute lymphoblastic leukemia who develops tumor lysis…](https://mymerci.kr/pages/nclex_q.php?qn_id=540760) - [A nurse is caring for a 45-year-old patient with acute lymphoblastic leukemia who received…](https://mymerci.kr/pages/nclex_q.php?qn_id=540761) - [A nurse is caring for a patient with acute leukemia who suddenly develops severe shortness…](https://mymerci.kr/pages/nclex_q.php?qn_id=540762) - [A nurse is caring for a 35-year-old patient with Hodgkin lymphoma who reports progressive …](https://mymerci.kr/pages/nclex_q.php?qn_id=540763) --- More free questions: [기출문제](https://mymerci.kr/) _학습 참고용입니다. 실제 임상은 최신 지침과 소속 기관 프로토콜을 따르세요._