CTO at the proximal RCA,ambigous of the proximal cap and long CTO lesion without calcification.Retrograde approach was successful using intimal retrograde wire escalationtechnique. Through septal channel, retrograde wire can cross the CTO lesion andenter the antegrade guiding catheter. But the gears (microcatheter and smallestballoon) can not cross the lesion. Using balloon trapping technique at theantegrade guiding catheter, this technique give more support and finallyretrograde balloon and microcatheter can cross the CTO lesion. The CTO wassuccessfully performed and 3 drug eluting stent implanted with the good result.
In retrograde approac, when wire cancross the CTO lesion and enter already enter in the antegrade guiding catheter,but gears can not cross, the trapping balloon technique may give additionalsupport in order the gears can cross.