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Published on: April 12, 2024
Viewpoint: the type A- and the type B-variants of Decompression Sickness
A E Koch1, H Wegner-Bröse, V Warninghoff
1German Naval Medical Institute, Kiel-Kronshagen, Germany.
Summary
Neurological decompression sickness (DCS/AGE) may present as severe (Type A) or mild (Type B) symptoms. Type A DCS/AGE cases showed worse outcomes and required more hyperbaric treatments than Type B, suggesting distinct clinical entities.
Area of Science:
- Diving Medicine
- Neurology
- Hyperbaric Medicine
Background:
- Neurological decompression sickness (DCS/AGE) presents with varied symptom severity.
- It remains unclear if severe and mild DCS/AGE symptoms represent distinct clinical entities or a symptom spectrum.
Purpose of the Study:
- To investigate whether severe (Type A) and mild (Type B) neurological decompression sickness/arterial gas embolism (DCS/AGE) are distinct clinical entities.
- To compare clinical outcomes and hyperbaric treatment requirements between Type A and Type B DCS/AGE.
Main Methods:
- Retrospective analysis of 267 DCS/AGE cases.
- Classification into Type A (severe, stroke-like symptoms) and Type B (mild, doubtful symptoms) subgroups.
- Comparison of hyperbaric treatments (HTs) and clinical outcomes.
Main Results:
- 42 cases were classified as Type A DCS/AGE and 225 as Type B DCS/AGE.
- Type A patients exhibited more severe symptoms, required more HTs, and had poorer outcomes compared to Type B patients.
- This suggests Type A and Type B DCS/AGE may represent different conditions.
Conclusions:
- Type A and Type B DCS/AGE likely represent distinct entities with differing pathophysiologies.
- Type B DCS/AGE appears to have a better clinical outcome.
- Further research is needed, particularly on Type B DCS/AGE, to understand these pathophysiological differences.
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