The nurse cares for a client with chest pain which assessment finding requires immediate action?

Nursing assessment of a client with chest pain prioritizes early identification of signs indicating myocardial ischemia, decreased cardiac output, or life-threatening dysrhythmias. Chest pain can be associated with acute coronary syndromes, where changes in heart rhythm may signal worsening cardiac instability. Continuous monitoring of vital signs, oxygenation, and response to treatment helps determine urgency. Findings suggesting impaired perfusion or electrical instability require immediate intervention. Rationale: A. A radial pulse of 110 beats per minute that is irregular indicates tachycardia with a possible dysrhythmia, such as atrial fibrillation or premature beats. Irregular rhythms can reduce cardiac output and compromise coronary perfusion, especially in the presence of chest pain. This finding suggests potential cardiac instability and requires immediate evaluation and intervention. B. An oxygen saturation of 95% on 2 L nasal cannula indicates adequate oxygenation. While oxygen therapy is appropriate in chest pain management, this value does not suggest respiratory compromise or immediate deterioration. Continued monitoring is necessary, but it does not require urgent action. C. An increase in blood pressure from 100/58 mmHg to 122/78 mmHg may reflect improved perfusion or response to treatment. This change is not inherently dangerous and may indicate stabilization rather than deterioration. It does not signal an urgent need for intervention compared to abnormal cardiac rhythm findings. D. Pain relief after two doses of sublingual nitroglycerin suggests that myocardial ischemia is responding to treatment. This is a positive clinical response and indicates improved coronary blood flow. It does not represent a worsening condition requiring immediate action.