Used diagnostically in patients with coronary artery disease to determine which arteries should receive a stent, it involves inserting a guide wire that measures pressure into the artery instead of relying solely on the traditional coronary angiogram.

FORBES: Comparative Effectiveness: Hope Or Hype?

They ended up producing a flexible catheter tube that goes a bit of the way up the nostrils, then a guide wire is inserted into the targeted sinus. (In live patients this is done via an endoscope and fluoroscope.) A balloon catheter is advanced over the guide wire and positioned against the blocked ostium.

FORBES: Balloon Therapy