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A 38 year-old female presents to the emergency department after falling down a ladder at home. She is complaining of left sided chest pain. Her initial vitals are: 37.3 C, BP 130/95, HR 88, O2 99% on room air. She is found to have decreased air entry on the left, with no lung sliding. Her portable chest X-ray shows a pneumothorax that is 10% in size. What is your next step?