| MAC | MacConkey [broth]; major ambulatory category; malignancy-associated changes; maximum allowable conce... |
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| QRS | in electrocardiography, the complex consisting of Q, R, and S waves, corresponding to depolarization... |
| SFC | soluble fibrin complex; soluble fibrin-fibrinogen complex; spinal fluid count |
| ARDS | acute respiratory distress syndrome; adult respiratory distress syndrome |
| IRDS | idiopathic respiratory distress syndrome; infant respiratory distress syndrome |
| 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) |
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| 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 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) |
| respiratory inhibitor | A compound that inhibits the respiratory chain. Synonym: respiratory poison. (05 Mar 2000) |
| respiratory insufficiency | Failure to adequately provide oxygen to cells of the body and to remove excess carbon dioxide from them. (12 Dec 1998) |
| respiratory lobule | The part of the airway consisting of a respiratory bronchiole and all of its branches. Synonym: primary pulmonary lobule, respiratory lobule. (05 Mar 2000) |
| respiratory mechanics | The physical or mechanical action of the lungs, diaphragm, ribs, and chest wall during respiration. It includes airflow, lung volume, neural and reflex controls, mechanoreceptors, breathing patterns, etc. (12 Dec 1998) |
| respiratory metabolism | The exchange of respiratory gases in the lungs, oxidation of foodstuffs in the tissues, and production of carbon dioxide and water. (05 Mar 2000) |
| respiratory metal | A metal present in certain respiratory pigments; e.g., iron, manganese, copper, vanadium. (05 Mar 2000) |