Application of a rapid exchange extension catheter technique in type B2/C nonocclusive coronary intervention via a transradial approach

Table 3 Summary of procedural characteristics

Procedural characteristic	n (%) or mean ± SD
Procedural results
Technique success	128 (94.8)
PCI success	125 (92.6)
Stent implantation	124 (91.9)
DCB therapy	1 (0.7)
Artery path
Right radial artery	128 (94.8)
Left radial artery	5 (3.7)
Distal radial artery	2 (1.5)
Indication for using a rapid exchange extension catheter
Difficult balloon delivery	35 (25.9)
Difficult stent delivery	96 (71.1)
Difficult posterior expansion balloon	4 (3.0)
Preprocess lesion before delivering the rapid exchange catheter
Multiple predilatation	77 (57.0)
Buddy wire technique	45 (33.4)
Balloon anchoring technique	8 (5.9)
Cutting balloon modification	5 (3.7)
Depth of extension catheter intubation (mm)	25.3 ± 15.4
Rapid exchange catheter service time1 (min)	18.9 ± 9.7
PCI operation time2 (min)	35.8 ± 16.6
Mean length of stents (mm)	33.5 ± 14.4
Mean diameter of stents (mm)	2.75 ± 0.45
Length of DCB (mm)	30.0
Diameter of DCB (mm)	3.0
Contrast dose (mL)	162.2 ± 38.3
Perioperative dual antiplatelet
Aspirin + clopidogrel	77 (57.0)
Aspirin + ticagrelor	58 (43.0)
Perioperative anticoagulant
Unfractionated heparin	98 (72.6)
Bivalirudin	37 (27.4)

¹The time from rapid exchange extension catheter entering the coronary artery to returning to the guide catheter after stent implantation. ²The time from the guide catheter entering the coronary artery opening to the end of the operation. PCI: Percutaneous coronary intervention; DCB: Drug-coated balloon.