hyperventilation

hyperventilation /hy·per·ven·ti·la·tion/ (-ven″tĭ-la´shun)

1. abnormally increased pulmonary ventilation, resulting in reduction of carbon dioxide tension, which, if prolonged, may lead to alkalosis.

2. see under syndrome.

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hy·per·ven·ti·la·tion (hpr-vntl-shn)

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.

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hyper·venti·late v.

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Hyperventilation

Rapid, deep breathing, possibly exceeding 40 breaths/minute. The most common cause is anxiety, although fever, aspirin overdose, serious infections, stroke, or other diseases of the brain or nervous system.

Mentioned in: Barbiturate-Induced Coma, Respiratory Alkalosis

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hyperventilation

[-ven′tilā′shən]

Etymology: Gk, hyper + ventilare, to fan

pulmonary ventilation rate greater than that metabolically necessary for gas exchange, resulting from an increased respiration rate, an increased tidal volume, or both. Hyperventilation causes an excessive intake of oxygen and elimination of carbon dioxide and may cause hyperoxygenenation. Hypocapnia and respiratory alkalosis then occur, leading to dizziness, faintness, numbness of the fingers and toes, possibly syncope, and psychomotor impairment. Causes of hyperventilation include asthma or early emphysema; increased metabolic rate caused by exercise, fever, hyperthyroidism, or infection; lesions of the central nervous system, as in cerebral thrombosis, encephalitis, head injuries, or meningitis; hypoxia or metabolic acidosis; use of hormones and drugs, such as epINEPHrine, progesterone, and salicylates; difficulties with mechanical respirators; and psychogenic factors, such as acute anxiety or pain. Compare hypoventilation. See also respiratory center.

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hyperventilation (hīˈ·per·venˈ·t·lāˑ·shn),

n condition in which the body exhales carbon dioxide at a rate faster than which it is being produced. May cause dizziness and tingling of toes and fingers and chest pain if continued. Also called
overbreathing.

Hyperventilation.

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hyperventilation,

n 1. an abnormally prolonged, rapid, and deep breathing; also the condition produced by overbreathing of oxygen at high pressures. It is marked by confusion, dizziness, numbness, and muscular cramps brought on by such breathing.
n 2. rapid, deep, forced breathing frequently resulting from anxiety. It results in a transient loss of carbon dioxide and respiratory alkalosis. Symptoms include anxiety, circumoral numbness, tingling sensation, faintness, and occasionally, carpopedal spasms, tetany, and syncope.

hyperventilation, managing,

n the steps that may be taken to assist a patient who experiences sudden, increased respiration that may be the result of anxiety or pain; may include verbal reassurances, repositioning, or deep breathing exercises.

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hyperventilation

1. increase of air in the lungs above the normal amount.

2. abnormally prolonged and deep breathing, usually associated with acute anxiety or emotional tension. A transient, respiratory alkalosis commonly results from hyperventilation. More prolonged hyperventilation may be caused by disorders of the central nervous system, or by drugs.

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hyperventilation syndrome

nervous or hyperexcitable dogs may hyperventilate to the point of syncope.

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hyperventilation

Pulmonology An ↑ in respiratory frequency or volume Effect ↓ CO₂, intracranial pressure Physiology pH-mediated cerebrovascular constriction; hypocarbia may restore cerebral auroregulation, alkalinze CSF, ↑ perfusion of ischemic brain tissue Complications Cerebral hypoxia, inverse steal, rebound intracranial HTN, myocardial ischemia