inspiratory 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.

in·spi·ra·to·ry ca·pac·i·ty

the volume of air that can be inspired after a normal expiration; it is the sum of the tidal volume and the inspiratory reserve volume.
Synonym(s): complementary air

inspiratory capacity

n.
The volume of air that can be inhaled after normal inspiration.

lung volumes

Physiology A group of air 'compartments' into which the lung may be functionally divided
Lung volumes  
Expiratory reserve capacity–ERV The maximum volume of air that can be voluntarily exhaled
Functional residual capacity (FRV) Volume left in the lungs at the end of a normal breath which is not normally part of the subdivisions
Inspiratory capacity–IC The maximum volume that can be inhaled
Inspiratory Reserve capacity–IRC The maximum volume that can be inhaled above the tidal volume
Tidal volume–VT The normal to-and-fro respiratory exchange of 500 cc; vital capacity is the maximum amount of exhalable air; after a full inspiration, which added to the residual volume, is the total lung capacity
Total lung capacity–TLC The entire volume of the lung, circa 5 liters
Vital capacity–VC The maximum volume that can be inhaled and exhaled  

in·spi·ra·to·ry ca·pa·ci·ty

(in'spir-ă-tōr-ē kă-pas'i-tē)
The volume of air that can be inspired after a normal expiration; it is the sum of the tidal volume and the inspiratory reserve volume.
Synonym(s): complementary air.
References in periodicals archive ?
The finding that conical-PEP breathing significantly improved inspiratory capacity and slow vital capacity confirms that it has a real effect on exercise-induced hyperinflation.
The finding that inspiratory capacity did not change during exercise in the control intervention was surprising but may reflect the fact that these patients had only moderate airflow obstruction.
Parameters with a significant impact on survival after univariate Cox model analysis were PaC[O.sub.2], inspiratory capacity, age, BMI, predicted percentage of [FEV.sub.1] total symptom duration in years, predicted percentage of FVC, [FEV.sub.1]/FVC, Pa[O.sub.2], C-reactive protein level, erythrocyte sedimentation rate, radiographic extent of bronchiectasis, and chronic colonization by P.
Breathing pattern variability, cough inspiratory capacity, high PEEP leak test and minute ventilation response often help avoid unnecessary diversions to the weaning protocol "off ramps" that keep patients chained to the ventilator.
SVC: slow vital capacity; IC: inspiratory capacity; ERV: expiratory reserve volume; FVC: forced vital capacity; [FEV.sub.1]: forced expiratory volume in 1 s; [FEF.sub.25-75%]: forced mid-expiratory flow phase; PEF: peak expiratory flow; MVV: maximal voluntary ventilation; TV: tidal volume.
Guidelines for selecting an MDI for patient use must include making certain the patient is able to follow instructions, has an adequate inspiratory capacity, is capable of a breath hold of 4 to 10 seconds and has a stable respiratory rate and pattern.
Reduced tidal volume expansion during exercise correlated with reduced inspiratory capacity, which, in turn, correlated with reduced inspiratory muscle strength.
Results: An improvement in FVC, inspiratory capacity, FEV(1), expiratory reserve volume, and performance assessed by 6MWT were observed after rehabilitation.

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