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The recording of volume changes in health and disease has from old been designated as "Plethysmography". This was supposed to be a correct term for the recording (graphein) of an increase in volume (plethysmos). The present paper shows that the choice of this term was not felicitous, and suggests an alternative. The first "plethysmographic" recordings are ascribed to Glisson (1622) and Swammerdam (1737). Since Glisson and Swammerdam did, in fact, record the volume of muscle to be constant on contraction, their measurements should probably have been referred to as "isography". This, however, is merely a historical matter. Presently venous outflow measurement is a common procedure to establish the diagnosis of deep vein thrombosis. Venous outflow is determined by recording the decrease in volume of a limb which occurs after release of a congestion cuff. As this is quite the opposite of what is meant by "Plethysmography", another indication is needed for this examination. It appears that a suitable alternative can be taken from ancient Greek medical literature. 相似文献
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Differentiation of "esophageal" and "cardiac" chest pain 总被引:1,自引:0,他引:1
P M Schofield P J Whorwell P E Jones N H Brooks D H Bennett 《The American journal of cardiology》1988,62(4):315-316
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The "transformation" from marxian "values" to competitive "prices": a process of rejection and replacement
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Samuelson PA 《Proceedings of the National Academy of Sciences of the United States of America》1970,67(1):423-425
The well-known transformation procedure for transforming from Marxian values to competitive prices is shown to be logically of the form: „Anything” equals „anything else” multiplied by „anything/anything else.” 相似文献
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With the advent of new medical technologies and medicines, as well as due to changes in disease patterns and demographic problems rises the need for continued increases in health spending. Increased costs can be totally inadequate, if it has been done without studying the effectiveness of medical interventions, based on the results of evidence-based medicine and economic of their feasibility. To evaluate the clinical effectiveness of medical interventions have been recently used specific criteria, so called points of clinical efficacy (surrogate and endpoints), that allow to conclude feasibility or harmfulness of the introduction or application of the intervention in clinical practice. The endpoint is reliable indicator the effectiveness of medical intervention. Surrogate point--is a biomarker that is intended to replace the endpoint and is a predictor of the effectiveness of medical intervention. The use of surrogate points has several advantages such as simple in identification and measurement, as well as more higher in compare with endpoints the vents frequency, that can significantly reduce the size of the selection and duration and cost of clinical trials, respectively. Finally, the surrogate points allow to evaluate treatment effect in situations where the use of endpoints is difficult or is unethical. 相似文献
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Circulating insulins. "Big" and "little" 总被引:6,自引:0,他引:6
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