Subjects will receive 10-session BreEStim and 10-session EStim treatment in a random order. The interval between BreEStim and EStim is at least 2 weeks. The following assessment will be made before and after~Visual analogue scale (VAS).~Quantitative sensory testing (QST). It includes non-invasive assessment of tactile sensation threshold (TST), electrical sensation threshold (EST), electrical pain threshold (EPT), and thermal thresholds.~Hear rate variability (HRV). It consists of 5-minute electrocardiogram (ECG) recording before and after a treatment session.
The purpose of this study is to compare the effectiveness of innovative intervention of breathing controlled electrical stimulation (BreEStim) and conventional electrical stimulation (EStim) in management of neuropathic phantom limb pain in patients after limb amputation after multiple sessions of treatment.