 BioSig Technologies Inc NASDAQ:BSGM, which is commercializing an innovative signal processing platform designed to improve signal fidelity and uncover the full range of ECG and intra-cardiac signals, has added two experienced electrophysiology regional directors to lead its commercial expansion across the southeast and central regions of the US. The company said Robert Sandler, who will lead regional sales across Texas, brings more than 25 years of sales experience in medical devices. 