Fig. 3.

Effect of slow breathing on 6-min walk test in group 1 (a), group 2 (b) and respiratory exchange ratio (RER) in group 1 (c), group 2 (d) from baseline to 6 months (M) follow-up (FU). CPET was available in all patients at baseline, in 18 patients at 3 months (one erythema, one ICD intervention during 6MWT, one refusal) and in 14 patients at 6 months follow-up (two ICD interventions following 6MWT, one haemoptysis, one pulmonary infection, one refusal refused, two deaths)