Angioplasty and stenting procedures (or percutaneous coronary interventions/PCIs) are performed more than four million times around the world every year to open up blockages in coronary arteries to allow the heart to receive proper blood flow. Most of these procedures — 80-85 percent — are only guided by traditional angiography, an x-ray of the blood vessels that requires a contrast agent to be flushed into the heart to identify where the blockages are.

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