This book reviews the theory and practice of fractional flow reserve (FFR)-guided coronary intervention, a technique that gives sense and a rationale to daily decisions in the interventional suite. FFR guidance provides detailed information on coronary hemodynamics for the interventional cardiologist. This technique has profound practical implications for therapeutic decisions and for the prognosis of patients. The Atlas of FFR-Guided Percutaneous Coronary Interventions provides practicing physicians clear information to understand both the complexity of the technique and the correct way to apply it. It is designed both to assist younger faculty and those in training, and to act as a clinical resource for more experienced practitioners. Using the clinical cases outlined, the reader can learn to appreciate the pitfalls, tips and tricks that simplify the performance and interpretation of FFR and iFR.