ventilation

ventilation /ven·ti·la·tion/ (ven″tĭ-la´shun)

1. breathing; the exchange of air between the lungs and the environment, including inhalation and exhalation.

2. circulation, replacement, or purification of the air or other gas in a space.

3. the equipment with which this is done.

4. verbalization of one's problems, emotions, or feelings.

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alveolar ventilation  the amount of air that reaches the alveoli and is available for gas exchange with the blood per unit time.

high-frequency ventilation  mechanical ventilation in which small tidal volumes are delivered at a high respiration rate.

maximum voluntary ventilation  maximal breathing capacity; the greatest volume of gas that can be breathed per minute by voluntary effort.

mechanical ventilation  that accomplished by extrinsic means; usually either negative pressure v. or positive pressure v.

minute ventilation  total v.; the total volume of gas in liters exhaled from the lungs per minute.

negative pressure ventilation  mechanical ventilation in which negative pressure is generated on the outside of the patient's chest and transmitted to the interior to expand the lungs and allow air to flow in; used with weak or paralyzed patients.

positive pressure ventilation  mechanical ventilation in which air is delivered into the airways and lungs under positive pressure, usually via an endotracheal tube, producing positive airway pressure during inspiration.

pulmonary ventilation  a measure of the rate of ventilation, referring to the total exchange of air between the lungs and the ambient air.

total ventilation  minute v.

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ven·ti·la·tion (vntl-shn)

n.

1. The replacement of fresh air or gas for stale or noxious air or gas in a space.

2. See respiration.

3. Aeration or oxygenation, as of blood.

4. The verbal expression of feelings or emotions in psychotherapy.

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venti·late v.

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ventilation.

See respiration, def. 2.

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ventilation/perfusion (V/Q) ratio,

the ratio of pulmonary alveolar ventilation to pulmonary capillary perfusion, both quantities expressed in the same units.

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ventilation (ven´tilā´shn),

n the constant supplying of oxygen through the lungs.

ventilation, air,

n the process of supplying alveoli with air or oxygen.

ventilation, mouth-to-mouth,

n a method by which a rescuer uses the air in his or her own lungs to fill the lungs of another person who has stopped breathing in order to oxygenate that person's blood. See respiration, artificial.

ventilation, respiratory,

n the process of getting air into and out of the lungs. The air enters the oral cavity and nose and must go through the conduction system (the pharynx, larynx, trachea, and bronchial tree) into the lungs. This ventilating process involves many other structures as well, including the abdomen, thorax, and maxillofacial tissues. The latter structures make two significant contributions to the respiratory process: they provide the portal of entry and egress for the air to and from the lungs, and they alter the physical properties of inspired air for protection of the very sensitive lung tissues.

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ventilation

renewal or exchange of gas in an enclosed space.

1. the process or act of supplying a building or part of it continuously with fresh air.

2. in respiratory physiology, the process of exchange of air between the lungs and the ambient air. Pulmonary ventilation (usually measured in liters per minute) refers to the total exchange, whereas alveolar ventilation refers to the effective ventilation of the alveoli, where gas exchange with the blood takes place. See also air movement.

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alveolar ventilation

the amount of gas expelled from the alveoli to the outside of the body per minute.

artificial ventilation

see artificial respiration.

assisted ventilation

the depth of spontaneous ventilation is augmented by the anesthetist, as by squeezing the rebreathing bag.

controlled ventilation

breathing is done entirely by a mechanical device or the anesthetist squeezing the rebreathing bag.

dead space ventilation

see dead space.

high frequency ventilation

mechanical ventilation that delivers gas at more than four times the normal rate of breathing.

intermittent mandatory ventilation (IMV)

a type of mechanical ventilation in which the ventilator is set to deliver a prescribed tidal volume at specified intervals and a high-flow gas system permits the patient to breathe spontaneously between cycles. The ventilator rate is set to maintain the patient's Paco₂ at normal levels and is reduced gradually to zero as the patient's condition improves.

intermittent positive-pressure ventilation (IPPV)

the provision of mechanical ventilation by a machine designed to deliver breathing gas until equilibrium is established between the patient's lungs and the ventilator. IPPV machines are positive-pressure, pressure-cycled, assister-controller (pneumatic) devices.

Because of their compact size and capability of operating independently of an electrical current, the IPPV machines have the most widespread applicability in the employment of a form of treatment called intermittent positive-pressure breathing.

maximal voluntary ventilation (MVV)

the maximal volume that can be exhaled per minute by the patient breathing as rapidly and deeply as possible.

mechanical ventilation

that accomplished by extrinsic means.

minute ventilation

the total amount of gas (in liters) expelled from the lungs per minute.

ventilation mismatch

mismatches of ventilation and blood flow, as in chronic obstructive lung disease, are a common cause of hypoxemia.

ventilation:perfusion ratio

the ratio of air ventilation to the blood perfused. Called also VA/Q. The degree of oxygenation of the blood and the proportional excretion of CO₂ are both dependent on both variables being optimal.

positive pressure ventilation

administration of oxygen under pressure, usually by use of an anesthetic bag or mechanical ventilator. See also continuous positive airway pressure, positive end-expiratory pressure.

spontaneous ventilation

breathing without the assistance of any ventilator or mechanical device.

total ventilation

the amount of air moved out of (or into) the airways and alveoli over a specified time period.

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ventilation

Pulmonology The exchange of air between the lungs and the outside air. See Dead space, High-frequency ventilation, Jet ventilation, Maximum voluntary ventilation, Mechanical ventilation, Noninvasive positive pressure ventilation, Partial ventilation, Staircase ventilation Public health The circulation of air from one space to another, usually understood to mean the replacement of ambient air with fresh air from another source. See General exhaust, Local exhaust, Mechanical exhaust.

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Patient discussion about ventilation.

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Q. Help her to breathe. My sixteen year old cousin (girl) who is wondering if she is suffering from asthma, anxiety or both. She is thin, healthy girl and have been very worried She have asthma and have been thinking about it constantly. When she exercise, she get more out of breath, more worn out, and her heart beats faster than other people. Sometimes her chest hurts, but people tell me that is from my chest muscles being worked. She get a little dizzy also. When she go to bed at night sometimes it seems hard to breathe. She can take a deep breath and everything but it seems hard or something. I know there isn't anything wrong with my heart because she had an EKG done recently and chest x-rays. That was fine. When it is hot humid and muggy outside she find it hard to breath. Do you think she have asthma. She don't have any coughing or any known wheezing. Could thinking about every breath she take seem like she have asthma? She really want to know and me too, what is going on! Please help her to breathe!!!!

A. PS--alcohol and cigarettes can cause this problem to(drugs)mrfoot56.