Modified Rankin Scale

The modified Rankin Scale (mRS) is a commonly used scale for measuring the degree of disability or dependence in the daily activities of people who have suffered a stroke or other causes of neurological disability, and it has become the most widely used clinical outcome measure for stroke clinical trials. It was originally introduced in 1957 by Dr. John Rankin of Stobhill Hospital Glasgow, Scotland, and first modified to its currently accepted form by Prof. C. Warlow's group at Western General Hospital in Edinburgh for use in the UK-TIA study in the late 1980s. The first publication of the current modified Rankin Scale was in 1988 by van Swieten, et al., who also published the first interobserver agreement analysis of the modified Rankin Scale.

Interobserver reliability of the mRS can be improved by using a structured questionnaire during the interview process and by having raters undergo a multimedia training process. The multimedia mRS training system developed by Prof. K. Lees' group at the University of Glasgow is available online. More recently, several tools have been developed to more systematically determine the mRS, including the mRS-SI, the RFA, and the mRS-9Q. The mRS-9Q is in the public domain and a free web calculator is available at www.modifiedrankin.com.