Severely calcified coronary arteries are among the toughest challenges in interventional cardiology. When calcium is so hard and extensive that balloons cannot dilate it, rotational atherectomy — a tiny diamond-coated burr spinning at up to 200,000 rpm — sands away the calcium and gives the stent a chance to expand properly.
Calcium in the coronary arteries behaves like concrete in a pipe. When it is severe, it resists the balloon dilatation that normally prepares a lesion for stenting. Attempt to force a stent into an unyielding calcified segment and it will underexpand — the single strongest predictor of stent failure, restenosis, and thrombosis. Rotational atherectomy exists to solve this problem.
How Rotablation Works
Rotational atherectomy uses a small, olive-shaped burr coated with microscopic diamond crystals. The burr is advanced over a specialised guidewire to the calcified lesion and spun at very high speed — typically 140,000 to 200,000 revolutions per minute. As it rotates, it selectively abrades the hard, inelastic calcium while sparing the healthy, elastic arterial wall, which flexes away from the burr. The calcium is ground into microscopic particles small enough to pass harmlessly through the circulation.
The principle is called differential cutting: hard tissue is removed, soft elastic tissue is preserved. The result is a modified, more compliant lesion that can then be dilated with a balloon and adequately stented.
"Rotablation doesn't open the artery — it changes the calcium so that everything we do afterwards actually works. Without proper preparation, the best stent in the world will fail."
— Dr. Zaidoun Hajali, MD FSCAI FRCPWhen Is It Used?
Rotational atherectomy is reserved for heavily calcified lesions that cannot be adequately prepared with balloons alone — including lesions a balloon cannot cross or expand. It is particularly valuable in undilatable lesions, severely calcified ostial disease, and cases where intravascular imaging (IVUS or OCT) has confirmed a heavy calcium burden that will prevent stent expansion. Modern practice increasingly uses imaging to guide the decision, rather than relying on the angiographic appearance alone.
It is one of several calcium-modification tools available today — alongside intravascular lithotripsy (IVL) and cutting balloons. Each has its ideal use case, and experienced operators select the right tool, or combination of tools, for the specific calcium pattern.
What the Procedure Involves
Rotablation is performed during the PCI procedure, through the same radial or femoral access. After the calcified lesion is identified and assessed with imaging, the rotational atherectomy burr is used in short passes, with attention to burr speed and technique to minimise complications. Once the calcium is adequately modified, the procedure continues with balloon dilatation and stent implantation as usual. The atherectomy portion itself typically adds a modest amount of time to the overall procedure.
- Severely calcified arteries resist balloon dilatation, leading to stent underexpansion — the strongest predictor of stent failure.
- Rotational atherectomy uses a diamond-coated burr spinning at up to 200,000 rpm to abrade calcium selectively.
- The principle of differential cutting removes hard calcium while sparing the healthy, elastic arterial wall.
- It is reserved for heavily calcified, undilatable lesions — often guided by IVUS or OCT confirmation.
- It is one of several calcium-modification tools alongside IVL and cutting balloons; experienced operators select the right approach.
