An Unusual Presentation of Pulmonary Edema During an Ice Dive at Altitude.

Military diving operations occur in a wide range of austere environments, including high-altitude environments and cold weather environments; however, rarely do both conditions combine. Ice diving at altitude combines the physiologic risks of diving, a hypothermic environment, and a high-altitude environment all in one. Careful planning and consideration of the potential injuries and disease processes affiliated with the aforementioned physiologic risks must be considered. In this case report, we describe a Navy diver who became obtunded secondary to hypoxia during an ice dive at 2,987 m (9,800 ft) elevation and was subsequently diagnosed with high-altitude pulmonary edema. Further consideration of the environment, activities, and history does not make this a clear case, and swimming-induced pulmonary edema which physiologically possesses many overlaps with high-altitude pulmonary edema may have contributed or been the ultimate causal factor for the diver's acute response.

Spontaneous Pneumopericardium in a U.S. Marine: Do not Lose Heart.

We report an unusual case of extensive subcutaneous emphysema, pneumomediastinum, and pneumopericardium identified in an otherwise healthy U.S. Marine who was enrolled in the Marine Corps School of Infantry. His training regimen included prolonged periods of yelling and elevation changes during sustained hiking through hilly terrain. The patient presented to the Fast Track with normal vital signs but complained of dyspnea, cough, and subjective fevers. Although he lacked a history of trauma, he was found to have pneumopericardium, pneumomediastinum, and subcutaneous emphysema without pneumothorax. He was admitted to the general surgery service for observation and was ultimately released back to his unit after 24 hours. To our knowledge, pneumopericardium has never been attributed to persistent yelling in the setting of a lower respiratory tract infection and should be considered in the differential of atraumatic chest symptomatology in otherwise healthy military service members.