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MediumRespiratory medicinePneumothoraxukmlamrcem sbapane

A 23-year-old man is brought to A&E with sudden onset of shortness of breath and pleuritic chest pain. A chest X-ray shows a visceral pleural line with no lung markings peripheral to it, suggesting a primary spontaneous pneumothorax. He is otherwise stable. According to guidelines, what is the most appropriate initial step?

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