A kit for coronary treatment comprising a pressure sensing guidewire that includes a pressure sensor for measuring pressure within a patients vasculature. A sheath comprising a tube having a proximal end and a distal end and defining an internal lumen sized for receiving the pressure sensing guidewire a hemostasis valve positioned over the proximal end of the tube a cylindrical element attached to the distal end of the tube, the cylindrical element having an internal lumen sized for receiving a conventional guidewire wherein the pressure sensing guidewire is configured to be slideably insertable into the tube from the proximal end of the tube and further wherein, the tube is configured to permit the pressure sensing guidewire, including the pressure sensor, to freely slide distally and proximally within the tube at the election of a user.
