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What is the benz: The Bends: Prevention, Symptoms & Treatment

Decompression Sickness – Harvard Health

What is it?

Decompression sickness, also called generalized barotrauma or the bends, refers to injuries caused by a rapid decrease in the pressure that surrounds you, of either air or water. It occurs most commonly in scuba or deep-sea divers, although it also can occur during high-altitude or unpressurized air travel. However, decompression sickness is rare in pressurized aircraft, such as those used for commercial flights.

When you scuba dive with compressed air, you take in extra oxygen and nitrogen. Your body uses the oxygen, but the nitrogen is dissolved into your blood, where it remains during your dive. As you swim back toward the surface after a deep dive, the water pressure around you decreases.

If this transition occurs too quickly, the nitrogen does not have time to clear from your blood. Instead, it separates out of your blood and forms bubbles in your tissues or blood. It is these nitrogen bubbles that cause decompression sickness. The condition is called the bends because the joint and bone pains can be so severe they double you over.

What happens inside your body during decompression sickness is similar to what happens when you open a carbonated drink. When you open the can or bottle, you decrease the pressure surrounding the beverage in the container, which causes the gas to come out of the liquid in the form of bubbles. If nitrogen bubbles form in your blood, they can damage blood vessels and block normal blood flow.

Factors that put you at higher risk of decompression sickness include:

  • Heart muscle birth defects, including patent foramen ovale, atrial septal defect, and ventricular septal defect
  • Being older than 30
  • Being female
  • Low cardiovascular fitness
  • High percentage of body fat
  • Use of alcohol or tobacco
  • Fatigue, seasickness or lack of sleep
  • Injuries (old or current)
  • Diving in cold water
  • Lung disease

Someone with an abnormal hole or opening in the heart from a birth defect is at especially high risk of developing serious symptoms from decompression illness. Because bubbles create high blood pressure in the lungs, blood and bubbles from your veins may flow more readily through the heart’s opening. This means your blood can re-circulate into arteries without first getting oxygen. An opening in the heart can also allow a relatively large air bubble (called an air embolism) to circulate into your arteries. An air embolism can cause a stroke.

People with asthma or another lung disease may have thin-walled air pockets in their lungs called bullae. These pockets do not empty quickly when the persons exhales. As they return to the surface after a deep dive, air in the bullae may expand. If a bulla ruptures, it could cause a collapsed lung or allow a large air bubble (air embolism) to enter the arteries.


Symptoms of decompression sickness include:

  • Joint pain  
  • Dizziness
  • Headache
  • Difficulty thinking clearly
  • Extreme fatigue
  • Tingling or numbness
  • Weakness in arms or legs
  • A skin rash


Your diving history and symptoms are key factors in diagnosing decompression sickness. Blood tests and joint X-rays usually do not show any signs of the problem.

Expected duration

Joint pain, the most common symptom from decompression sickness, can last for days or weeks.


To minimize the risk of decompression sickness while diving:

  • Dive and rise slowly in the water, and don’t stay at your deepest depth longer than recommended. Scuba divers typically use dive tables that show how long you can remain at a given depth.
  • Do not fly within 24 hours after diving.
  • Don’t drink alcohol before diving.
  • Avoid hot tubs, saunas or hot baths after diving.
  • Make sure you are well hydrated, well rested and prepared before you scuba dive. If you recently had a serious illness, injury or surgery, talk to your doctor before diving.

Some people should avoid diving altogether, or should consider special risks. If you have a heart defect, it is not safe to dive. If you have asthma, a history of a ruptured lung at any time in your life or another lung disease, discuss diving safety with a doctor before deciding whether to dive. A person who requires insulin to treat diabetes may have wide swings in blood glucose levels during a dive, and caution is advised. Avoid diving if you have a groin hernia that has not been repaired, since expanding gas in the hernia can cause symptoms.


Emergency treatment for decompression sickness involves maintaining blood pressure and administering high-flow oxygen. Fluids also may be given. The person should be placed left side down and if possible the head of the bed tilted down.

The optimal treatment is the use of a hyperbaric oxygen chamber, which is a high-pressure chamber in which the patient receives 100% oxygen. This treatment reverses the pressure changes that allowed gas bubbles to form in the blood stream. The treatment drives nitrogen back into its liquid form so that it can be cleared more gradually from the body over a period of hours.

It is not recommended that divers with decompression sickness attempt to treat themselves with deep diving.

When to call a professional

If you experience symptoms of decompression sickness after scuba diving or flying, get to a doctor as soon as you can. Hyperbaric treatment is most successful if given within several hours after symptoms start.


Most cases of decompression sickness respond well to a single treatment with hyperbaric oxygen. Your doctor may suggest repeated treatments if you continue to experience symptoms, especially neurological symptoms.

Additional info

Undersea & Hyperbaric Medical Society


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    The Mercedes-Benz brand for motorists from all over the world is not only one of the most recognizable and significant car manufacturers in the world, but also directly associated with the very concept of “car”. And this is justified at least by the historical significance of the brand: exactly 130 years ago, the German engineer Karl Benz officially filed a patent for a “vehicle with a gasoline engine.”

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    The legendary brand got its name from the nickname of the daughter of the Austrian businessman Emil Jellinek named Adriana (Mercedes is the girl’s nickname). Her father, Honorary Vice Consul in Monaco, was wealthy and interested in modern technology. At his request in 189In the year 7, Gottlieb Daimler installed a 6 horsepower two-cylinder engine on a vehicle. After the success of this project, he ordered 4 more copies and sold them at a profit.

    The same Mercedes She had a four-cylinder engine with a volume of almost 6 liters. and a power of 35 hp. The car was characterized by a wide wheelbase, a low center of gravity and an inclined steering column.

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    The merger of the two most famous German manufacturers at that time took place in 1926. Thanks to the deal, the industrialists not only managed to survive in the difficult post-war period, but also significantly expanded their business.

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    The collaboration between Benz and Daimler turned out to be one of the longest in the history of the automotive industry, as both companies in this combination survived until 1998. Their first joint car was the K.

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