Stroke: Any acute clinical event, related to impairment of cerebral circulation, that lasts longer than 24 hours.1

Sudden death: Unexpected death that is instantaneous or occurs within minutes or hours from any cause other than violence.3

Sudden infant death syndrome (SIDS): The sudden death of an apparently healthy infant that remains unexplained after all known possible causes have been ruled out through autopsy, death scene investigation, and review of the medical history.1

Surveillance: Systematic and continuous collection, analysis, and interpretation of data, closely integrated with the timely and coherent dissemination of the results and assessment to those who have the right to know so action can be taken. It is an essential feature of epidemiologic and public health practice. The final phase in the surveillance chain is the application of information to health promotion and to disease prevention and control. A surveillance system includes functional capacity for data collection, analysis, and dissemination linked to public health programs.4

Syncope: Loss of consciousness and postural tone caused by diminished cerebral blood flow.1

Systemic lupus erythematosus: An inflammatory connective tissue disease with variable features, frequently including fever, weakness and fatigability, joint pains or arthritis resembling rheumatoid arthritis, diffuse erythematous skin lesions on the face, neck, or upper extremities, with liquefaction degeneration of the basal layer and epidermal atrophy, lymphadenopathy, pleurisy or pericarditis, glomerular lesions, anemia, hyperglobulinemia, and a positive LE cell test result, with serum antibodies to nuclear protein and sometimes to double-stranded DNA and other substances.1

Tetanus: A disease marked by painful tonic muscular contractions, caused by the neurotropic toxin (tetanospasmin) of Clostridium tetani acting on the central nervous system.1

Thrombocytopenia: A condition in which an abnormally small number of platelets is present in the circulating blood.1

Thromboembolic events: An occurrence that induces thromboembolism.2

Thromboembolism: Condition in which a blood clot forms in a vein that is deep inside the body; also known as deep venous thrombosis.2

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