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Anesthesia awareness is a potentially disturbing adverse effect wherein patients who have been paralyzed with muscle relaxants may awaken. They may be aware of their surroundings but unable to communicate or move. Neurologic monitoring equipment that helps to more closely check the patient's anesthesia stages is now available to avoid the occurrence of anesthesia awareness.

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Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.

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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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Cyanide works by making the human body unable to use oxygen.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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