Resting Indices: Different Scales, Same Results

Key Takeaways

  • All iFR information is already included in Pd/Pa; iFR calculates Pd/Pa during diastole.
  • Pd/Pa and iFR contain 95% of the same information. Therefore, a Pd/Pa cutoff of 0.91 = an iFR cutoff of 0.89.1,2
  • Pd/Pa and iFR have equivalent results in comparison to other physiologic measures, including FFR and CFR.