456 diastolic blood pressure The second, lower number in a blood pressure reading, indi-

glĀ°ssary cating the pressure in the blood vessels when the heart rests between beats and fills with blood.

digestive tract Also known as the gastrointestinal tract. The muscular tube through which food passes during digestion. The digestive tract consists of the mouth, throat, esophagus, stomach, and intestines.

digital rectal examination An examination in which a doctor inserts a lubricated, gloved finger into the patient's rectum and feels the prostate gland for irregularities or for an increase in size. The examination is also performed to look for occult (hidden) blood and to evaluate the rectum.

diuretic An antihypertensive that rids the body of excess water or salt by increasing the amount lost in urine. Diuretics are commonly used to treat high blood pressure and heart failure.

diverticula See diverticulum.

diverticulitis Inflammation or infection of diverticula. diverticulosis The presence of diverticula in the intestines.

diverticulum Singular of diverticula. A small bulge or pouch protruding through the intestinal wall. Diverticula also can occur in the urethra and the esophagus.

DNA See deoxyribonucleic acid.

do-not-resuscitate order An advance directive that states that no one should perform heroic measures, including cardiopulmonary resuscitation (CPR) and the use of mechanical life support equipment, to restart a person's heart should it stop.

drainage angle The tiny channel through which fluid leaves the eyeball.

DRE See digital rectal examination. duodenal ulcer See ulcer, duodenal.

duodenum The first section of the small intestine, beginning at the lower end of the stomach and extending to the jejunum.

durable power of attorney for healthcare An advance directive in which a competent person gives another person the power to make healthcare decisions for him or her.

DVT See thrombosis, deep vein.

dysthymia A chronic, less intense form of depression.

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