Emergency Management of Abdominal Pain After Deep Diving
A diver presenting with abdominal pain after deep diving should be immediately evaluated with ultrasound and CT imaging to detect venous gas bubbles, followed by urgent hyperbaric oxygen therapy (HBOT) as the primary treatment for decompression sickness, while simultaneously ruling out life-threatening complications like intestinal necrosis, mesenteric venous thrombosis, or tension pneumoperitoneum that may require surgical intervention.
Initial Assessment and Diagnostic Approach
The abdominal pain in this scenario most likely represents decompression illness (DCI), specifically abdominal decompression sickness caused by nitrogen bubble formation in the venous system 1. However, the critical challenge is that this presentation can mimic surgical emergencies and may actually progress to require surgery.
Immediate Imaging Protocol
- Ultrasound first: Look for the characteristic "snowstorm pattern" in the portal vein and right ventricle, which indicates venous gas bubbles 2
- CT scan of abdomen and chest: Essential to identify:
This imaging must be performed rapidly but should not delay transfer to a hyperbaric facility if DCI is strongly suspected clinically.
Treatment Algorithm
Step 1: Initiate HBOT Immediately
The primary treatment for decompression sickness is rapid recompression therapy 1, 6. The prognosis improves significantly with rapid recompression 1. Transport the patient to a hyperbaric chamber facility urgently.
Step 2: Monitor for Surgical Complications During HBOT
Critical pitfall: Abdominal pain may persist or worsen despite HBOT, indicating complications that require surgical intervention 3. Specifically:
- Mesenteric venous thrombosis: Gas bubbles can trigger thrombosis in mesenteric and portal veins, leading to intestinal ischemia 3, 5
- Intestinal necrosis: May develop even after venous gas is reduced by HBOT 3
- Tension pneumoperitoneum: Can cause abdominal compartment syndrome requiring needle decompression 4
Step 3: Surgical Evaluation if Pain Persists
If abdominal pain worsens or fails to improve with HBOT, proceed with:
- Laparoscopic examination: Useful for both diagnosis and treatment to assess for intestinal necrosis 3
- Needle decompression: If tension pneumoperitoneum with compartment syndrome is present 4
- Bowel resection: May be necessary if necrosis is confirmed 3
Key Clinical Distinctions
Two Primary Sources of Abdominal Gas
- Pulmonary barotrauma: Air enters abdomen from lung injury during ascent 7
- Venous gas emboli: Nitrogen bubbles form in mesenteric/portal circulation during decompression 2, 6
The management differs significantly—pulmonary barotrauma with pneumoperitoneum may require surgical intervention, while venous gas emboli respond to HBOT 7.
Critical Timing Considerations
- Symptoms typically develop within 15 minutes of surfacing 6
- Patients may present days later (up to 10 days) with thrombotic complications 5
- HBOT effectiveness decreases with delayed treatment 1
- Do not delay HBOT for extensive workup unless surgical emergency is evident
Common Pitfalls to Avoid
- Assuming all abdominal pain post-dive is benign: Abdominal DCI can progress to cardiovascular collapse and death 1
- Delaying imaging: Both ultrasound and CT should be performed immediately 2
- Stopping at HBOT alone: MVT should be included in differential diagnosis of persistent abdominal pain after HBOT 3
- Missing compartment syndrome: Tension pneumoperitoneum requires immediate needle decompression before transfer 4
Multidisciplinary Coordination
A team including hyperbaric physicians and surgeons is necessary for proper management 7. The hyperbaric physician manages recompression while the surgeon monitors for complications requiring intervention.