Since the stock-jolting phase III blowup in March of Milestone Pharmaceuticals Inc.’s etripamil for paroxysmal supraventricular tachycardia (PSVT), questions have lingered regarding the short-acting channel blocker’s regulatory path forward – but no longer. Shares of Montreal-based Milestone (NASDAQ:MIST), which in the spring plummeted to an all-time low of $1.70, made up for the loss and then some, closing at $8.91, up $5.57, or 167%, on word that the FDA has agreed to terms whereby an NDA for the nasal spray may be submitted without launching another phase III study.