What We Learned from The History of Multiple Sclerosis Measurement: Expanded Disability Status Scale.

Multiple Sclerosis (MS) is often seen in young adults and known to cause both physical and cognitive disability, and it is quite important to make an objective assessment of the physical-cognitive disability status of the patients. The first scale that assesses the physical disability in MS cases, the Disability Status Scale (DSS) elaborated in 1983 and transformed into the Expanded DSS (EDSS). It has been in use since 1983 without much change, which is one of its most significant advantages. It includes all functional systems (although with some shortcomings) that may be affected in MS and reflects the clinical status as a number, which is quite valuable. Although there may be differences between EDSS practitioners, it has been in use for more than 30 years and it can objectively display the difference between a patient's clinical picture 20 years ago and today, which can be said for only a small number of scales. This shows the importance of using the same scale for diseases that require long-term monitoring such as MS. In conclusion; it is a consensus that EDSS will not undergo major changes so that its greatest advantage can be preserved. Also, the consensus in the available literature is that EDSS will never lose its value.