iRhythm Technologies (IRTC) shares soared 21.7% in the last trading session to close at $75.59. The move was backed by solid volume with far more shares changing hands than in a normal session. This compares to the stock's 11.4% loss over the past four weeks.iRhythm Technologies scored a strong price increase driven by the optimism surrounding the recent FDA 510(k) clearance for design changes and enhancements previously made to its Zio AT device. It supports the company’s remediation efforts with the FDA a ...