The symptom of breathlessness is a common feature of both respiratory and cardiac problems and is subjective and difficult to quantify thereby causing problems for researchers wanting to assess interventions and compare treatments. In order to develop a measure of the effect of breathlessness on everyday life, data which had been collected from studies on pneumoconiosis in Welsh coal miners were used to develop a series of questions about the disability resulting from breathlessness [1]. This was then developed into the familiar Medical Research Council (MRC) breathlessness/dyspnoea scale and was published in 1959 [2]. A respiratory questionnaire has also been developed by the MRC and is published along with guidance for interviewers, the latest version being published in 1986 [3]. The respiratory questionnaire was specifically designed for large epidemiological studies of between 100 and 1000 patients and is explicitly not for individual use [3].
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