Cystic fibrosis can lower the normal salt levels in the body, which can lead to a variety of short- and long-term problems.
Sweat glands cool the body by releasing perspiration (sweat) from the lower layers of the skin onto the surface. Sodium and chloride (salt) help carry water to the skin's surface and are then reabsorbed into the body. As the water evaporates, heat is carried away, and the body cools.
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The tuberculin skin test (TST) -- also commonly known as the PPD and performed in a doctor's office or health department -- is a reliable detector of TB in most people. It is used to detect TB in individuals at risk for new infection, such as health care workers or close contacts of infected individuals, and those at increased risk due to a weakened immune system. A small amount of liquid purified protein derivative (PPD) from the TB bacteria is injected just under the top layer of skin on your arm...
In people who have cystic fibrosis, the salt travels to the skin's surface with the water and is not reabsorbed. Because of this, the skin of a child who has cystic fibrosis is abnormally salty. Parents may notice salty-tasting skin when they kiss the child.
People who have cystic fibrosis can become quickly depleted of salts, especially when the weather is hot, when they exercise strenuously, or when they have a fever. Low salt levels in the body lead to fatigue, weakness, fever, muscle cramps, stomach pain, vomiting, dehydration, and heatstroke. To avoid these conditions, people who have cystic fibrosis need to keep well hydrated and keep healthy salt levels in the body. Sports drinks that contain electrolytes (such as sodium and potassium) are especially good to help replace lost salts. Do not use salt tablets without talking to your doctor first.
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WebMD Medical Reference from Healthwise
July 18, 2013
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