Dream, pre-sleep
Dream, pre-sleep: Also called a hypnagogic hallucination, this type of dream is characteristically vivid and occurs as one is falling asleep or awakening.
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- Dreams
Dreams: Thoughts, visions, and other sensations that occupy the mind in sleep. Dreams occur during that part of sleep when there are rapid eye movements (REMs). We have 3 to 5 periods of REM sleep per night. They usually come at intervals of 1-2 hours and are quite variable in length. An episode of REM […]
- Dressler syndrome
Dressler syndrome: Pericarditis (inflammation of the pericardium, the sac-like covering of the heart) after a heart attack. Named for the Polish-born American physician William Dressler (1890-1969).
- Drill, dental
Drill, dental: A device that dentists use to drill into teeth. Primitive dental drills were used in the 18th and early 19th centuries. In 1868, American dentist George F. Green added power to the drill with a pneumatic version run by a pedal-powered bellows. In 1871, dentist James B. Morrison added pedal power to a […]
- Drip
Drip: Short for intravenous drip, a device for administering a fluid drop-by-drop into a vein via an intravenous (IV) route.
- Dropsy
Dropsy: An old term for the swelling of soft tissues due to the accumulation of excess water. In years gone by, a person might have been said to have dropsy. Today one would be more descriptive and specify the cause. Thus, the person might have edema due to congestive heart failure. Edema is often more […]