6 Minute Walk Distance
Why Use
Primarily used to assess response to interventions in patients with moderate to severe heart or lung disease ( American Thoracic Society guidelines ). Can be used to measure functional status in patients who are elderly, frail, and/or otherwise unable to tolerate treadmill exercise tests. Commonly used in patients with COPD, heart failure, arthritis, and neuromuscular disorders.
Formula
Pearls / Pitfalls
Original cohort did not include patients <40 or >80 years old and non-Caucasian patients. Widely used across specialities dealing with geriatrics and/or chronic disease. Intended to be carried out along a flat straight walking course 30 m (100 ft) long, with brightly colored tape marking the starting line (as well as every 60 m lap). Use of a treadmill is not recommended. More detailed instructions are available in the American Thoracic Society guidelines . Known to be less accurate in shorter patients, who have shorter strides.
Advice
Treat the underlying disorder. 6MWD can be serially measured to assess progression of disease and response to treatment.