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| Narcolepsy |
a disorder that causes excessive sleepiness during the day and frequent and uncontrollable episodes of falling asleep |
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| Narcosis |
a drug (or other chemical)-induced drowsiness or stupor |
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| Narcotic |
an addictive substance that blunts the senses; can cause confusion, stupor, coma, and death with increased dosages |
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| Narcotic analgesics |
a type of painkiller that blocks the transmission of pain signals in the brain; often cause tolerance (the need for higher amounts of the drug to produce the same effect) and drug dependence |
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| Nasal septum |
the section of the nose that divides the left and right nostrils; made of cartilage and bone and covered by a mucous membrane |
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| Nasogastric tube |
a thin, plastic tube that is inserted through the nose, down the oesophagus, and into the stomach; used to drain, wash, or take samples from the stomach, or to feed very sick patients who cannot eat |
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| Nasopharynx |
the passageway connecting the back of the nose to the top of the throat |
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| Natural childbirth |
a technique of giving birth that stresses relaxation techniques so that the use of pain-relieving drugs can be minimised; also called prepared childbirth |
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| Natural methods of family planning |
methods of planning a family that focus on a woman's time of ovulation, either so that pregnancy can be avoided or conception is likely |
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| Nausea |
feeling the need to vomit |
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| Nebulizer |
an instrument that provides a drug in its misted form through a face mask; used for severe asthma attacks and for children who have asthma but cannot use an inhaler |
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| Necrosis |
the medical term for the death of tissue cells |
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| Needle aspiration |
the use of a thin, hollow needle and syringe to remove body fluid for examination |
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| Needle biopsy |
the use of a hollow, wide-diameter needle to remove a sample of tissue for examination |
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| Neonate |
a term used to describe a new-born infant from birth to 1 month of age |
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| Neoplasm |
another term for a tumour |
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| Nephrectomy |
the surgical removal of one or both kidneys |
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| Nephritis |
inflammation of one or both kidneys because of an infection, an abnormal immune system response, or a disorder of metabolism |
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| Nephroblastoma |
a fast-growing cancer of the kidneys that occurs most commonly in children under 4 years of age |
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| Nephrolithotomy |
surgical removal of a kidney stone |
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