परिभाषा

Decompression sickness (DCS) occurs when the body is exposed to a sudden drop in surrounding pressure. DCS occurs most frequently during deep sea diving or when flying in a nonpressurized aircraft.

का कारण बनता है

DCS is caused by the formation of gas bubbles in the blood and tissues. At normal altitudes, nitrogen and other gases are exhaled or dissolved in the blood and tissues. However, during severe changes in altitude and air pressure, nitrogen and other gases form gas bubbles. These bubbles block the flow of blood. This condition can be fatal if not treated quickly.

जोखिम कारक

The only risk factor that increases your chance of getting DCS is a sudden reduction in pressure. This occurs as a result of:

  • Rising too quickly to the surface from deep sea scuba diving
  • A fast ascent into a high altitude from a low altitude
  • Sudden exit from a high pressure or hyperbaric chamber
  • Increased risk with increased depth of dive
  • Long duration of dive
  • Multiple dives in one day
  • Flying after diving
  • Diving in cold water
  • थकान
  • Exertion
  • निर्जलीकरण
  • मोटापा
  • उम्र बढ़ गई

लक्षण

The less severe type of DCS is called DCS I. It primarily results in inflammation of muscles, joints, and tendons, resulting in pain and swelling. This is commonly referred to as the bends. Although pain may occur anywhere in the body, it is most common in or near an arm or leg joint. The pain may become more severe over time. Itching, skin mottling, weakness, and fatigue also occur.

The more severe type of DCS is called DCS II. This results in more serious systemic effects, including neurological symptoms such as numbness and tingling. In the most severe form, numbness may lead to paralysis and even death. Other symptoms of DCS II include:

  • पेट दर्द
  • पीठ दर्द
  • सिरदर्द
  • चक्कर आना
  • भ्रम
  • नज़रों की समस्या
  • सिर का चक्कर
  • Chest pain and severe coughing
  • झटका

If an individual dives occupationally and has regular exposure to increased pressure, a mild, chronic case of the bends may occur without detection. Over time, this can result in deterioration of affected joints and bones.

विसंपीडन बीमारी

निदान

The doctor will ask about your symptoms and medical history. A physical exam will be done. When DCS is suspected, treatment is often started immediately without any delay for examination or testing. Blood and other diagnostic tests are not usually helpful.

उपचार

If you experience symptoms of DCS, it is extremely important to get treatment right away. In severe cases, delayed treatment may be fatal.

If you have DCS I, breathing 100% oxygen from a mask may be sufficient treatment. You should also be monitored carefully for other symptoms.

The treatment for DCS II is oxygen therapy in a hyperbaric chamber. This device works by gradually increasing and then decreasing air pressure around the body. This forces gas bubbles to dissolve. Oxygen should be administered through an oxygen mask during transport to a hyperbaric chamber.

Treatment should be given even if initial symptoms are mild or disappear. Proper treatment given quickly should cure all symptoms of DCS.

If you are diagnosed with DCS, follow your doctor’s instructions.

रोकथाम

DCS may be prevented by:

  • Limiting the depth and duration of deep sea dives
  • Following standard diving guidelines
  • Avoiding diving if you are obese, pregnant, have heart or lung problems, or have had a recent joint or limb injury
  • Avoiding excessive alcohol consumption for 24 hours before diving
  • Avoiding flying for 24 hours after deep sea diving
  • Avoiding repeated dives within a 12-hour period
  • Avoiding flights in nonpressurized aircraft

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