VB SC 050S Lecture Notes - Lecture 14: Pathognomonicity, Medical Diagnosis, Stethoscope
5 Oct 2016
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Goal is to establish an etiologic diagnosis: etiologic: causing or contributing to the cause of a disease or condition. Symptoms vs sign: symptom: subjective presence of the disease, only the patient knows. Examples: stomach ache: sign: objective evidence of disease obvious to observer. Example: being bent over the middle, clutching sides: pathognomonic sign: sign that separates out a single disease very few true pathognomonic signs exist. Diagnostic procedures: can be applied to a herd, or to individual animals systematically, signalment. Herd history: environmental conditions: housing type, ventilation, diet, disease prevalence, immunization program. Being immunized, especially for animals, is not a reason to fully rule out a disease. Physical examination: inspection, palpation: feeling for abnormalities with light pressure, auscultation: listening with a stethoscope, percussion: tapping ngers and judging sound waves around the body. Diagnostic aids: biochemical testing of blood, urine, sensitivity testing, microbiology.
