hyperventilation

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hyperventilation

[hahy-per-ven-tl-ey-shuhn]
noun
1.
excessively rapid and deep breathing.
2.
a condition characterized by abnormally prolonged and rapid breathing, resulting in decreased carbon dioxide levels and increased oxygen levels that produce faintness, tingling of the fingers and toes, and, if continued, alkalosis and loss of consciousness.

Origin:
1925–30; hyper- + ventilation

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Collins
World English Dictionary
hyperventilation (ˌhaɪpəˌvɛntɪˈleɪʃən)
 
n
an increase in the depth, duration, and rate of breathing, sometimes resulting in cramp and dizziness

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American Heritage
Medical Dictionary

hyperventilation hy·per·ven·ti·la·tion (hī'pər-věn'tl-ā'shən)
n.
Abnormally fast or deep respiration resulting in the loss of carbon dioxide from the blood, thereby causing a decrease in blood pressure and sometimes fainting.


hy'per·ven'ti·late' v.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica
Encyclopedia

hyperventilation

sustained abnormal increase in breathing. During hyperventilation the rate of removal of carbon dioxide from the blood is increased. As the partial pressure of carbon dioxide in the blood decreases, respiratory alkalosis, characterized by decreased acidity or increased alkalinity of the blood, ensues. In turn, alkalosis causes constriction of the small blood vessels that supply the brain. Reduced blood supply to the brain can cause a variety of symptoms, including light-headedness and tingling of the fingertips. Severe hyperventilation can cause transient loss of consciousness.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Despite the source of your fear, flying may make your heart race, your palms sweat and may cause hyperventilation.
Hyperventilation is rapid or deep breathing that can occur with anxiety or panic.
The term hyperventilation is usually used if you are taking rapid, deep breaths because of anxiety or panic.
For example, hyperventilation is one of the primary physical manifestations of panic disorders.
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