3-Minute <i>versus</i> 6-minute walk test in pulmonary arterial hypertension

<title>Extract</title> The 6-minute walk test (6MWT) is a simple measure of functional capacity in patients with cardiopulmonary diseases [1, 2]. Six minutes was selected over 2-minutes and 12-minutes “as a sensible compromise” [3]. A 1-minute walk test was proposed as an alternative to the 6MWT in pulmonary arterial hypertension (PAH), demonstrating correlation with established measures [4]. In interstitial lung disease, desaturation nadir can be identified during 3-minutes of walking [5]. Similarly, in chronic obstructive pulmonary disease, a 3-minute walk test (3MWT) has shown correlation with 6MWT, suggesting shorter tests may be useful [6].