| NOS | network operating system; nitric oxide synthetase; non-organ-specific; not on staff; not otherwise s... |
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| OAR | organ at risk |
| OBF | organ blood flow |
| OC | obstetrical conjugate; occlusocervical; office call; on call; only child; optic chiasma; oral contra... |
| OPO | Organ Procurement Organization |
| respiratory circulation | The mechanisms of pulmonary circulation coordinated with the heart and systemic circulation. It involves the flow or interruption of the flow of blood to the lungs as it affects respiration. Pulmonary circulation, a circulatory concept, emphasizes the passage of blood from the right to the left heart through the lungs. Respiratory circulation coordinates this with heart action, systemic circulation, and breathing. (12 Dec 1998) |
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| respiratory coefficient | <physiology> Molar ratio of carbon dioxide production to oxygen consumption. (18 Nov 1997) |
| respiratory dead space | That portion of the respiratory tract, from the nose and mouth to the terminal bronchioles, in which exchange of oxygen and carbon dioxide does not occur (anatomical dead space), together with the space in alveoli occupied by air that does not participate in oxygen-carbon dioxide exchange (physiologic dead space). It reflects the nonuniformity of ventilation and perfusion in the lung. (12 Dec 1998) |
| respiratory distress syndrome | <syndrome> A condition of the newborn marked by dyspnea with cyanosis, heralded by such prodromal signs as dilatation of the alae nasi, expiratory grunt, and retraction of the suprasternal notch or costal margins, mostly frequently occurring in premature infants, children of diabetic mothers, and infants delivered by cesarean section, and sometimes with no apparent predisposing cause. (12 Dec 1998) |
| respiratory distress syndrome, adult | A syndrome of life-threatening progressive pulmonary insufficiency in the absence of known pulmonary disease, usually following a systemic insult such as surgery or major trauma. (12 Dec 1998) |
| respiratory distress syndrome of the newborn | A disease seen especially in premature neonates with respiratory distress; characterised postmortem by atelectasis and alveolar ducts lined by an eosinophilic membrane; also associated with reduced amounts of lung surfactant. Synonym: hyaline membrane syndrome, respiratory distress syndrome of the newborn. (05 Mar 2000) |
| respiratory enteric orphan virus | A nonenveloped icosahedral virus whose genome consists of double stranded RNA, belonging to the family Reoviridae, frequently found in both the respiratory and enteric tract. Synonym: REO virus. (05 Mar 2000) |
| respiratory enzyme | One of those enzyme's in tissues that is a part of an oxidation-reduction system accomplishing the conversion of substrates to CO2 and H2O and the transfer of the electrons removed to O2. (05 Mar 2000) |
| respiratory enzyme complexes | <biochemistry> The enzymes that make up the respiratory chain: NADH Q reductase, succinate Q reductase, cytochrome reductase, cytochrome C and cytochrome oxidase. (18 Nov 1997) |
| respiratory epithelium | The pseudostratified ciliated epithelium that lines the conducting portion of the airway, including part of the nasal cavity and larynx, the trachea, and bronchi. (05 Mar 2000) |
| respiratory exchange ratio | The ratio of the net output of carbon dioxide to the simultaneous net uptake of oxygen at a given site, both expressed as moles or STPD volumes per unit time; in the steady state, respiratory exchange ratio is equal to the respiratory quotient of metabolic processes. (05 Mar 2000) |
| respiratory failure | A clinical syndrome that is defined either by the inability to rid the body of C02 or establish an adequate blood oxygen level (PAO2). See: arterial blood gas. (27 Sep 1997) |
| respiratory frequency | The number of breaths per minute. (05 Mar 2000) |
| respiratory function tests | Measurement of the various processes involved in the act of respiration: inspiration, expiration, oxygen and carbon dioxide exchange, lung volume and compliance, etc. (12 Dec 1998) |
| respiratory hypersensitivity | A form of hypersensitivity affecting the respiratory tract. It includes asthma and hay fever. (12 Dec 1998) |