Sharp recanalization of peripheral arterial chronic total occlusions.

Peripheral arterial chronic total occlusions (CTOs) usually have calcified caps at either ends. When attempting endovascular recanalization, these calcified CTO caps may prevent the interventionist in crossing the lesion with conventional catheter and guidewire techniques. Using specialized CTO devices or re-entry devices can help crossing the CTO, but such devices are usually expensive, not always readily available and require specialist training prior to usage."Sharp recanalization" is an alternative method of crossing the CTOs. If it is not possible to cross the CTO with conventional catheter and guidewire technique, one can take out the floppy end of the guidewire and use the stiff or the "sharp" end of the guidewire to break the hard CTO cap. Once the CTO cap is broken, the stiff end is replaced by the floppy end of the guidewire again to proceed with balloon angioplasty and/or stenting.In order to safely use the sharp recanalization technique while minimizing the risk of perforation, sharp recanalization should only be attempted once conventional methods have failed. The interventionist should plan sharp recanalization with the vascular path in mind and decide in advance how far s/he will proceed. It can be helpful to set a time limit together with the intervention team, past which the sharp recanalization attempt will be abandoned. Using straight catheters can help directing the stiff guidewire tip to the center of the vascular lumen and reduce the risk of sub intimal dissection or arterial wall perforation.