Boston Scientific has received U.S. Food and Drug Administration (FDA) approval for the ACUITY™ X4 Quadripolar Left Ventricular (LV) leads. The FDA approval of the quadripolar leads, the wires that connect cardiac resynchronization therapy (CRT) devices to the heart, marks the first time the company will offer a full X4 CRT system – both the device and the leads – to the U.S. market.