When a coronary artery is heavily calcified, it becomes rigid. If a cardiologist tries to place a stent without properly "cracking" that calcium, the stent may not expand fully (under-expansion). This is a leading cause of stent thrombosis (clotting) or restenosis (re-narrowing). A high BACII score alerts the surgeon that they may need specialized tools like or Rotational Atherectomy . 2. Risk Stratification
The BACII score typically ranges from . A higher score indicates a more severe, intense addiction to cigarettes. bacii score