3. Coronary angiogram prior to LAD CTO recanalization Left coronary angio Caudal-LAO Right coronary angio RAO
4. Retrograde approach from the RCA through septal collaterals Corsair in the 2 nd posteroseptal branch Selective septal angio through the Corsair catheter
5. Retrograde approach from the RCA through septal collaterals Passage of Corsair catheter with retrograde anchoring Left coronary angiography, CaLAO
6. Retrograde approach from the RCA through septal collaterals Retrograde penetration of the distal cap Introducing the retrograde wire into the guiding catheter