You are caring for a patient who sustained rib fractures after hitting the steering wheel of his car. He is spontaneously breathing and receiving oxygen via a face mask. His oxygen saturation is 95%. During your assessment, the oxygen saturation drops to 80%. The patient's blood pressure has dropped from 128/76 mm Hg to 84/50 mm Hg. You do not auscultate any breath sounds on the left side of the chest and you notice JVD. You notify the physician and anticipate: