total lung capacity


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capacity

 [kah-pas´ĭ-te]
the power to hold, retain, or contain, or the ability to absorb; usually expressed numerically as the measure of such ability.
closing capacity (CC) the volume of gas in the lungs at the time of airway closure, the sum of the closing volume and the residual volume. See also closing volume.
decreased intracranial adaptive capacity a nursing diagnosis accepted by the North American Nursing Diagnosis Association, defined as the state in which intracranial fluid dynamic mechanisms that normally compensate for increases in intracranial volumes are compromised, resulting in repeated disproportionate increases in intracranial pressure in response to a variety of noxious and nonnoxious stimuli.
diffusing capacity see diffusing capacity.
forced vital capacity the maximal volume of gas that can be exhaled from full inhalation by exhaling as forcefully and rapidly as possible. See also pulmonary function tests.
functional residual capacity the amount of gas remaining at the end of normal quiet respiration.
heat capacity the amount of heat required to raise the temperature of a specific quantity of a substance by one degree Celsius.
inspiratory capacity the volume of gas that can be taken into the lungs in a full inhalation, starting from the resting inspiratory position; equal to the tidal volume plus the inspiratory reserve volume.
maximal breathing capacity maximum voluntary ventilation.
thermal capacity heat capacity.
total lung capacity the amount of gas contained in the lung at the end of a maximal inhalation.
 Subdivisions of total lung capacity: TLC, total lung capacity; V, tidal volume; IC, inspiratory capacity; FRC, functional residual capacity; ERV, expiratory reserve volume; VC, vital capacity; RV, residual volume. From Dorland's, 2000.
virus neutralizing capacity the ability of a serum to inhibit the infectivity of a virus.
vital capacity (VC) see vital capacity.

to·tal lung ca·pac·i·ty (TLC),

the inspiratory capacity plus the functional residual capacity; that is, the volume of air contained in the lungs at the end of a maximal inspiration; also equals vital capacity plus residual volume.

total lung capacity

Lung physiology The total volume of air contained in the lungs at the end of maximum respiration. See Lung volumes. Cf Functional residual capacity, Vital capacity.

to·tal lung ca·pac·i·ty

(TLC) (tō'tăl lŭng kă-pas'i-tē)
The inspiratory capacity plus the functional residual capacity, i.e., the volume of air contained in the lungs at the end of a maximal inspiration; also equals vital capacity plus residual volume.

to·tal lung ca·pac·i·ty

(TLC) (tō'tăl lŭng kă-pas'i-tē)
The inspiratory capacity plus the functional residual capacity.
References in periodicals archive ?
Forced vital capacity (FVC), forced expiratory volume in one second ([FEV.sub.1]), average forced expiratory flow between 25 and 75 per cent of vital capacity ([FEF.sub.25-75]), total lung capacity (TLC), functional residual capacity (FRC), arterial oxygen saturation (Sa[O.sub.2]), arterial oxygen tension (Pa[O.sub.2]), arterial carbon dioxide tension (PaC[O.sub.2]) Table II.
(24) The difference in the expiratory and inspiratory scans also showed significant positive correlations with residual volume and total lung capacity. (25) In another report, abnormal HRCT findings, such as bronchiectasis, emphysema and mosaic pattern of lung attenuation were found to be more common in asthma with moderate to severe airflow limitation and in those with a prolonged history of asthma.
Parameter Mean SD Range VC (%) 70 23.3 22.2-128.6 [FEV.sub.1] (%) 49.4 20.8 16.1-100.4 [FEV.sub.1]%VC 53.4 13 32.7-90.9 RV (%) 210.9 81.9 35.3-405.7 TLC (%) 125 31.6 54.4-205 RV%TLC 65 14.8 16.4-87.6 [sR.sub.tot] (%) 337.4 241 47.8-1054.8 VC: vital capacity; [FEV.sub.1]: forced expiratory volume in one second; [FEV.sub.1]%VC: Tiffeneau index; RV: residual volume; TLC: total lung capacity; [sR.sub.tot]: specific total airway resistance.
On most pulmonary function testing machines, after the patient inspires to total lung capacity with the test gas, a manual or automatic valve can be selected to close so that the patient's held breath rests tightly against a valve or obstruction.
A simple, rough guide to the likely presence of distal inflammation is suggested by the following spirometry profile: Both the FEV1 and forced vital capacity (FVC) are decreased, yet the FEV1/FVC ratio remains normal, residual volume is high (suggesting air trapping in the distal airways), and total lung capacity can be either normal or high.
Total lung capacity (TLC) and residual volume (RV) were also obtained.
Their FVC was 68%, total lung capacity was 70%, and diffusing capacity was 47%.
* Recommended Dosage: The patient inhales air free of nitric oxide to total lung capacity and then slowly exhales into a mouthpiece.
Pulmonary function testing revealed reduced lung volumes, including forced ventilatory capacity (46% of predicted), forced expiratory volume in 1 sec (54% of predicted), total lung capacity (53% of predicted), functional residual capacity (43% of predicted), and carbon monoxide diffusing capacity (36% of predicted).
Obstructive ventilatory defect is seen in 10% of rheumatoid patients since the FEV1/FVC <80% with increased residual volume and total lung capacity ratio.
Patient was instructed to inhale completely and rapidly with a pause of one second at Total Lung Capacity and then to exhale maximally until no more air can be expelled while maintaining an upright posture.
Total lung capacity drops about 10 percent by age 70, and residual volume increases approximately 20 percent by age 60.

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