A client at 32 weeks with twin gestation develops sudden onset dyspnea, cough, and hypoxia. She has no fever or productive cough. Vital signs show HR 122 and SpO2 88% on room air. What is the priority diagnosis to rule out?
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A
Pulmonary embolism
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B
Pneumonia
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C
Asthma exacerbation
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D
Preterm labor with cord prolapse