Contemporary patterns of fractional flow reserve and intravascular ultrasound use among patients undergoing percutaneous coronary intervention in the United States: insights from the National Cardiovascular Data Registry.

To the Editor: The use of fractional flow reserve (FFR) and intravascular ultrasound (IVUS) to assess intermediate coronary stenoses (defined as 40% to 70% stenosis) has been associated with improved procedural and clinical outcomes ([1,2][1]) in patients undergoing percutaneous coronary

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