Hypervolemia
An abnormal increase in blood volume or, strictly speaking, an abnormal increase in the volume of blood plasma. From hyper- + volume + emia (blood).
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- Hyperventilation
Overbreathing. Hyperventilation causes dizziness, lightheadedness, a sense of unsteadiness, and tingling around the mouth and fingertips. Hyperventilation can be severe enough to mimic the early warning symptoms of a heart attack, and is therefore a common cause of emergency room visits in the US. Hyperventilation is common and normal after aerobic exercise. Hyperventilation can be […]
- Hypervolemic
Pertaining to hypervolemia, an abnormal increase in blood volume. For example, hypervolemic hyponatremia refers to the lowering of the blood sodium level due to hypervolemia, expansion of the blood volume.
- Hypnagogic
Concerning the drowsiness one commonly feels before sleep, the transitional state preceding sleep, and also the hallucinations that may occur at that time. The original French word “hypnagogique” was derived from Greek roots “hypno-“, sleep + “agogos”, leading = leading to sleep. In the 19th century “hypnagogique” came across the English Channel and became “hypnagogic.” […]
- Hypnagogic hallucination
A vivid dreamlike hallucination that occurs as one is falling asleep. The opposite of an hypnopompic hallucination which is a vivid dreamlike hallucination that occurs as one is waking up.
- Hypnic
1. Inducing sleep. 2. Pertaining to sleep. A hypnic jerk is a sleep start or jerk. From the Greek hypnikos, from the Greek hypnos, sleep.