PMC6191555_01
(A) Coronary angiogram of the completely occluded right coronary artery. (B) Coronary angiogram showing Rentrop grade II collateral flow to the right coronary artery from the left ascending coronary artery
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F1
Angiogram revealed that the coronary stent in mid-RCA was completely occluded (Fig. 1A) with Rentrop grade II collaterals from the left anterior descending artery (Fig. 1B).
(A) Coronary angiogram of the right coronary artery flow before cutting balloon dilatation. (B) Coronary angiogram of the right coronary artery flow after cutting balloon dilatation.
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F2
Despite several predilations with 1.5-x20-mm, 2.5-x20-mm, and 3.0-x20-mm balloons, a satisfactory angiographic result was not observed (Fig. 2A). To achieve better results, the 3.0-x15-mm cutting balloon, which resulted in TIMI II flow (Fig. 2B).
Coronary angiogram of the right coronary artery after two overriding coronary stents.
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F3
After dilation at 20 atm of pressure via a 3-x20-mm NC balloon, the result was satisfactory (Fig. 3).