The Chameleon's Technique: A Novel 3-in-6 Mother-and-Child Technique for Simultaneous Contralateral Angiography During Transradial Angioplasty of CTO via One Guide and One Puncture Site.

In order to obviate double arterial access for bi-coronary visualization during transradial intervention of chronic total coronary occlusions, a novel technique was used. A 3-in-6 mother-and-child technique was applied in which a 3 Fr intracoronary catheter was advanced via a 6 Fr guide into the artery supplying collaterals to the distal occluded segment of the right coronary artery (RCA). The same guide was used, with the 3 Fr catheter in situ, to visualize the occluded target vessel. With double contrast injections, the guidewire could be guided through the RCA occlusion while the intraluminal position could be visualized and confirmed. This was followed by successful drug-eluting stent implantation. This method to visualize both coronary arteries simultaneously is named the "Chameleon's technique."