CLAUDICATION DISTANCE IS POORLY ESTIMATED AND INAPPROPRIATELY MEASURED

Background Claudication distance is the commonest measure of the disab ility caused by lower-limb occlusive arterial disease. The accuracy of claudication distance as a surrogate for handicap has been assessed. Methods Seventy patients who attended a specialist vascular clinic wit h intermittent claudication were studied prospectively. Patients were asked to estimate their claudication distance and maximum walking dist ance before undergoing both a patient-controlled corridor walk and a f ixed-speed treadmill walk. Results The claudication distance reported by patients bore little relation to the distance recorded in the medic al correspondence. There was no correlation between the estimated dist ance and the actual distance walked on either a patient-controlled cor ridor walk or a fixed-speed treadmill walk. Most patients were able to walk substantially further at their own speed on the corridor than on the treadmill at a slower speed. Conclusion Claudication distance is spuriously estimated, inaccurately reported, falsely recorded, inappro priately measured and usually misinterpreted. It is of little value in judging the need for treatment. Objective measures of the handicap ca used by the disability of reduced walking distance are required if rat ional management decisions are to be made.