A nurse is assessing vital signs for a 45-year-old patient admitted with chest pain. The nurse obtains the following vital signs: temperature 98.6°F (37°C), pulse 110 bpm and irregular, respirations 22/min, blood pressure 90/50 mmHg, oxygen saturation 88% on room air. Which assessment finding requires immediate nursing intervention?
1Temperature of 98.6°F (37°C)
2Pulse rate of 110 bpm
3Oxygen saturation of 88% on room air✓ 정답
4Blood pressure of 90/50 mmHg
해설
Oxygen saturation of 88% indicates severe hypoxemia requiring immediate oxygen therapy to prevent tissue hypoxia and cardiac complications. Other findings like tachycardia and hypotension are concerning but less immediately life-threatening.
The patient is a 45-year-old adult presenting with chest pain, a classic symptom that raises immediate concern for acute coronary syndrome (ACS) or other life-threatening cardiopulmonary conditions. The vital signs reveal a pattern of hemodynamic instability and respiratory compromise: a rapid, irregular pulse (110 bpm), hypotension (90/50 mmHg), tachypnea (22/min), and critically low oxygen saturation (88% on room air). In the context of chest pain, this clinical picture is highly suggestive of a significant cardiac event leading to impaired cardiac output and pulmonary congestion, which directly compromises gas exchange .
Prioritization Using the ABC Framework
In NCLEX-RN prioritization, the Airway, Breathing, Circulation (ABC) framework is the cornerstone of clinical decision-making. While all four vital signs are abnormal except for temperature, the nurse must identify the finding that poses the most immediate threat to life. A blood pressure of 90/50 mmHg (Circulation) and a pulse of 110 bpm and irregular (Circulation) are critical findings indicating potential cardiogenic shock. However, an oxygen saturation of 88% on room air represents a direct failure of the "Breathing" component, signifying severe hypoxemia. Hypoxemia leads to inadequate oxygen delivery to vital organs, including the myocardium, which can worsen ischemia, precipitate lethal dysrhythmias, and cause irreversible brain injury within minutes. Evidence-based pre-examination processes for acute chest pain emphasize that rapid assessment and immediate correction of hypoxemia are fundamental to stabilizing the patient and preventing further cardiac decompensation [1].
Why Oxygen Saturation of 88% is the Priority
The pulse oximetry reading of 88% corresponds to a partial pressure of arterial oxygen (PaO2) of approximately 55 mmHg, which is on the steep portion of the oxyhemoglobin dissociation curve. At this level, small further decreases in oxygenation can cause a precipitous drop in oxygen content. This state of severe hypoxemia triggers a cascade of compensatory but ultimately harmful mechanisms, including increased myocardial work and anaerobic metabolism. The foundational principle of pulse oximetry screening for critical conditions is that low oxygen saturation is a key marker of life-threatening cardiopulmonary pathology requiring immediate intervention . Without rapid administration of supplemental oxygen, the patient’s condition will deteriorate. The nursing task of applying oxygen is a high-priority, non-delegable intervention that directly addresses the "B" in the ABCs, making it the most time-sensitive action .
Analysis of Other Assessment Findings
The other findings, while significant, are secondary to the immediate threat of hypoxemia. The hypotension (90/50 mmHg) reflects compromised "Circulation" and indicates poor cardiac output, which is the underlying cause of the clinical picture. The irregular tachycardia (110 bpm) is a compensatory mechanism for low stroke volume and a potential sign of myocardial irritability. Nursing interventions for these findings, such as initiating IV access, administering fluids cautiously, and obtaining an ECG, are critical but follow the immediate stabilization of the airway and breathing. The temperature is within normal limits. The optimized triage process for cardiac patients highlights that the initial assessment must rapidly identify and treat the most immediately life-threatening element, which, in this case, is the profound hypoxemia indicated by the oxygen saturation of 88% .
References (research sources)
[1]
Application of Continuous Improvement of Pre-Examination Process Based on Evidence-Based Nursing Concept in Acute Chest Pain of Adults.Research articleGan Q, Yao R. (2026) · DOI: 10.1155/emmi/8401158
Clinical Scenario
A 45-year-old patient presents with chest pain. Vital signs reveal a temperature of 98.6°F (37°C), an irregular pulse of 110 bpm, respirations of 22/min, blood pressure of 90/50 mmHg, and an oxygen saturation of 88% on room air. The nurse must determine which finding requires immediate intervention.
Prioritization Guide
Apply the ABC (Airway, Breathing, Circulation) framework. In a patient with suspected acute coronary syndrome, severe hypoxemia (O2 sat 88%) represents a direct failure of the 'Breathing' component. This condition leads to inadequate oxygen delivery to the myocardium and brain, worsening ischemia and risking lethal dysrhythmias. While hypotension (90/50 mmHg) and tachycardia (110 bpm, irregular) indicate circulatory compromise and potential cardiogenic shock, the immediate priority is to correct the hypoxemia. Administer high-flow oxygen to raise saturation above 94%, as this intervention supports both respiratory and circulatory function by improving myocardial oxygenation. Continuous monitoring and preparation for further cardiac interventions are essential.
Clinical Pearls
An oxygen saturation below 90% indicates severe hypoxemia and is a critical finding requiring immediate action.
The ABC framework dictates that breathing interventions precede circulation interventions when both are compromised.
In the context of chest pain, always assume a cardiac origin until proven otherwise and prioritize oxygenation to protect ischemic myocardium.
Hypoxemia — An abnormally low concentration of oxygen in the blood, typically defined as an oxygen saturation below 90% on room air, leading to inadequate tissue oxygenation.
ABC Framework — A prioritization model in nursing that stands for Airway, Breathing, and Circulation, used to determine the order of interventions based on immediate threats to life.
Acute Coronary Syndrome (ACS) — A spectrum of conditions caused by sudden, reduced blood flow to the heart, including unstable angina and myocardial infarction, often presenting with chest pain.
Cardiogenic Shock — A state of inadequate tissue perfusion due to cardiac pump failure, characterized by hypotension, tachycardia, and signs of poor organ perfusion.