Portal and Mesenteric Vein Thrombosis Associated with Decompression Sickness in a 48-Year-Old Deep Sea Self-Contained Underwater Breathing Apparatus (SCUBA) Diver.

BACKGROUND Deep sea diving can cause decompression illness which comprises both decompression sickness and arterial gas embolism. Decompression sickness is a clinical diagnosis with symptoms including dizziness, joint pain, rash, and myalgias and is due to nitrogen bubbles that form in tissues during ascent. These gas bubbles can be clinically silent even in the absence of decompression sickness and can rarely predispose a patient to venous thrombus, for which the role of hyperbaric oxygen (HBO) is undefined. The following case describes a male diver who developed portal and mesenteric venous thrombosis secondary to silent nitrogen venous bubbles. CASE REPORT A 48-year-old man developed abdominal pain 1 day after diving to a maximum depth of 13.7 m, without clinical symptoms of decompression sickness after surfacing. He presented to the Emergency Department 10 days later, and magnetic resonance angiogram revealed a diagnosis of gas containing superior mesenteric and portal vein thrombus. Due to the lack of guidelines of HBO with the presence of a thrombus and timing since onset, HBO therapy was not pursued. Oral anticoagulation was initiated, and symptoms resolved. CONCLUSIONS This patient developed gastrointestinal illness 1 day after diving that was later found to be due to thrombosis. Other etiologies were ruled out, making silent nitrogen bubbles within the venous system the most likely etiology. Vascular thrombosis is a rare complication of diving and lacks guidelines for treatment. While HBO is a known treatment for decompression sickness, there are no clinical guidelines for diving-associated thrombi, representing an area for further research.