A 22-year-old tall, thin man presents to the emergency department with a sudden onset of right-sided chest pain and shortness of breath. The symptoms started abruptly while he was sitting and studying. He has no significant past medical history, takes no medications, and does not smoke. His temperature is 37.0°C (98.6°F), blood pressure is 120/80 mmHg, heart rate is 112/min, respiratory rate is 22/min, and oxygen saturation is 96% on room air. Physical examination reveals decreased breath sounds and hyperresonance to percussion over the right hemithorax. Arrange the following differential diagnoses in order from highest to lowest pre-test probability based on this patient's clinical presentation.
- 1Primary spontaneous pneumothorax
- 2Pulmonary embolism
- 3Community-acquired pneumonia
- 4Acute myocardial infarction
Answer
The correct order from highest to lowest pre-test probability is: Primary spontaneous pneumothorax, Pulmonary embolism, Community-acquired pneumonia, and Acute myocardial infarction.
Primary spontaneous pneumothorax is the most probable diagnosis due to the characteristic physical exam (hyperresonance, decreased breath sounds) and demographic profile (tall, thin, young male). Pulmonary embolism is a distant second as a life-threatening possibility that lacks specific risk factors here. Pneumonia and myocardial infarction are much less likely due to the absence of fever or cough and the young age with a lack of cardiovascular risk factors, respectively.
Step-by-Step Solution
Key Concept
Formulating a prioritized differential diagnosis for sudden-onset chest pain based on specific patient demographics and physical examination findings.
Estimated Time:1m 0s