gas exchange

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exchange

 [eks-chānj´]
1. the substitution of one thing for another.
2. to substitute one thing for another.
gas exchange the passage of oxygen and carbon dioxide in opposite directions across the alveolocapillary membrane.
health care information exchange in the nursing interventions classification, a nursing intervention defined as providing patient care information to health professionals in other agencies.
impaired gas exchange a nursing diagnosis approved by the North American Nursing Diagnosis Association, defined as excess or deficit in oxygenation and/or carbon dioxide elimination at the alveolocapillary membrane (see gas exchange). Etiological and contributing factors include an altered oxygen supply, changes in the alveolar-capillary membrane, altered blood flow, and altered oxygen-carrying capacity of the blood. Defining characteristics include changes in mental status such as confusion, somnolence, restlessness, and irritability; ineffective coughing and inability to move secretions from the air passages; hypercapnia; and hypoxia. For specific medical treatments and nursing interventions, see airway clearance, ineffective; breathing patterns, ineffective; chronic airflow limitation; and anemia.
plasma exchange see plasma exchange.

gas exchange

or

gas carriage

the transfer of gases between an organism and the environment. In RESPIRATION, oxygen is taken in and carbon dioxide given out. Photosynthesis in plants complicates this system in that during the process carbon dioxide is required by the plant and oxygen given off (see COMPENSATION PERIOD). In plants and small animals such as PROTOZOANS and PLATYHELMINTHS, gas exchange occurs by DIFFUSION. In higher animals, special respiratory surfaces have been developed, for example, internal and external gills, lungs and trachea.

Gas exchange

The process by which oxygen is extracted from inhaled air into the bloodstream, and, at the same time, carbon dioxide is eliminated from the blood and exhaled.
Mentioned in: Respiratory Failure
References in periodicals archive ?
(2) The 2002 IDSA practice guidelines recommend against routine screening for and treatment of GAS carriage except under the circumstances (2 through 7) outlined in the evidence-based answer.
Beginning October 5, 2011, a total of436 persons (139 residents and 297 staff members) were screened for GAS carriage. Specimens were obtained from the oropharynx, wounds, and the skin surrounding patients' tracheostomies, gastrostomies, jejunostomies, central lines, and indwelling urinary catheters.
Given the absence of any additional cases of invasive GAS or increased GAS carriage rates among the varsity team, we screened the junior varsity team but treated only players with positive throat cultures.
Although typically only persons with epidemiologic linkage to index patients are cultured for possible GAS carriage, the circumstances described below resulted in more widespread collection of culture specimens.
To assess the prevalence of GAS carriage associated with the CCC, during February 17-19 throat swab specimens were obtained from all children attending the CCC, their household contacts, and all CCC employees.