Decompression sickness
| Decompression sickness | |
|---|---|
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| Two United States Navy sailors prepare for training inside a decompression chamber. | |
| Classification and external resources | |
| Specialty | Emergency medicine |
| ICD-10 | T70.3 |
| ICD-9-CM | 993.3 |
| DiseasesDB | 3491 |
| eMedicine | emerg/121 |
| MeSH | C21.866.120.248 |
Decompression sickness (DCS; also known as divers' disease, the bends or caisson disease) describes a condition arising from dissolved gases coming out of solution into bubbles inside the body on depressurisation. DCS most commonly refers to problems arising from underwater diving decompression (i.e., during ascent), but may be experienced in other depressurisation events such as working in a caisson, flying in an unpressurised aircraft, and extravehicular activity from spacecraft.
Since bubbles can form in or migrate to any part of the body, DCS can produce many symptoms, and its effects may vary from joint pain and rashes to paralysis and death. Individual susceptibility can vary from day to day, and different individuals under the same conditions may be affected differently or not at all. The classification of types of DCS by its symptoms has evolved since its original description over a hundred years ago.
Exposure to DCS on diving can be managed through proper decompression procedures and contracting it is now uncommon. Its potential severity has driven much research to prevent it and divers universally use dive tables or dive computers to limit their exposure and to control their ascent speed. If DCS is contracted, it is treated by hyperbaric oxygen therapy in a recompression chamber. If treated early, there is a significantly higher chance of successful recovery.
DCS is a subset of Decompression illness (DCI) which includes both DCS and Arterial gas embolism (AGE).
DCS is classified by symptoms. The earliest descriptions of DCS used the terms: "bends" for joint or skeletal pain; "chokes" for breathing problems; and "staggers" for neurological problems. In 1960, Golding et al. introduced a simpler classification using the term "Type I ('simple')" for symptoms involving only the skin, musculoskeletal system, or lymphatic system, and "Type II ('serious')" for symptoms where other organs (such as the central nervous system) are involved. Type II DCS is considered more serious and usually has worse outcomes. This system, with minor modifications, may still be used today. Following changes to treatment methods, this classification is now much less useful in diagnosis, since neurological symptoms may develop after the initial presentation, and both Type I and Type II DCS have the same initial management.
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