Hyperventilation


Hyperventilation
Overbreathing. Often due to anxiety. Overbreathing causes dizziness, lightheadedness, a sense of unsteadiness and tingling around the mouth and fingertips. Relief can be gotten by breathing in and out of a paper bag (to increase the level of carbon dioxide in the blood). Opposite, hypoventilation or underbreathing.
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Increased alveolar ventilation relative to metabolic carbon dioxide production, so that alveolar carbon dioxide pressure decreases to below normal. SYN: overventilation.

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hy·per·ven·ti·la·tion -.vent-əl-'ā-shən n excessive ventilation specif excessive rate and depth of respiration leading to abnormal loss of carbon dioxide from the blood called also overventilation

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n.
breathing at an abnormally rapid rate at rest. This causes a reduction of the carbon dioxide concentration of arterial blood, leading to dizziness, tingling (paraesthesiae) in the lips and limbs, tetanic cramps in the hands, and tightness across the chest. If continued, hyperventilation may cause loss of consciousness. This sequence of events occurs in the hyperventilation syndrome (HVS), which has been estimated to contribute to 10% of out-patient referrals to hospital.

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hy·per·ven·ti·la·tion (hi″pər-ven″tĭ-laґshən) 1. a state in which there is an increased amount of air entering the pulmonary alveoli (increased alveolar ventilation; see under ventilation). This results in reduction of carbon dioxide tension, eventually leading to alkalosis. See also hyperpnea, tachypnea, and hyperventilation syndrome. 2. abnormally prolonged, rapid, and deep breathing (polypnea), frequently used as a test procedure in epilepsy and tetany.

Medical dictionary. 2011.

Look at other dictionaries:

  • hyperventilation — ● hyperventilation nom féminin Augmentation de la ventilation pulmonaire par anxiété, activité physique ou maladie. ● hyperventilation (expressions) nom féminin Hyperventilation provoquée, augmentation des échanges gazeux entre les alvéoles et… …   Encyclopédie Universelle

  • hyperventilation — n. 1. The act or process of hyperventilating; breathing rapidly and deeply. [PJC] 2. (Med.) A condition in which alveolar carbon dioxide concentration is markedly lower than normal, usually due to breathing rapidly and deeply. [PJC] …   The Collaborative International Dictionary of English

  • hyperventilation — 1907, from HYPER (Cf. hyper ) + VENTILATION (Cf. ventilation). Earlier as a type of treatment for lung diseases …   Etymology dictionary

  • hyperventilation — [hī΄pər vent΄ l ā′shən] n. extremely rapid or deep breathing that may cause dizziness, fainting, etc. as a result of a rapid loss of carbon dioxide hyperventilate [hī΄pər vent΄ lāt΄] vi., vt. hyperventilated, hyperventilating …   English World dictionary

  • Hyperventilation — Not to be confused with hypoventilation. Hyperventilation ICD 10 R06.4 ICD 9 786.01 Hyperventilation or overbreathing is the state of breathing faster and/or deeper than normal …   Wikipedia

  • Hyperventilation — Klassifikation nach ICD 10 R06. Störungen der Atmung R06.4 Hyperventilation F45.33 Soma …   Deutsch Wikipedia

  • Hyperventilation — L hyperventilation ou accélération et amplification respiratoire est une ventilation non physiologique, c est à dire avec modification des pressions partielles normales des gaz sanguins. Lors d une hyperventilation, la pression partielle de… …   Wikipédia en Français

  • hyperventilation — /huy peuhr ven tl ay sheuhn/, n. 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,… …   Universalium

  • Hyperventilation — Hy|per|ven|ti|la|ti|on 〈[ vɛn ] f. 20; unz.; Med.〉 erhöhte Atmungstätigkeit, übermäßige Beatmung der Lunge [<Hyper... + lat. ventilare „fächeln“] * * * Hyperventilation,   über den Körperbedarf hinausgehende Beschleunigung oder Vertiefung der… …   Universal-Lexikon

  • hyperventilation — n. breathing at an abnormally rapid rate at rest. This causes a reduction of the carbon dioxide concentration of arterial blood, leading to dizziness, tingling (paraesthesiae) in the lips and limbs, tetanic cramps in the hands, and tightness… …   The new mediacal dictionary


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