PPG represents a fundamental advancement in coronary physiology, shifting clinical focus from individual stenoses to overall disease patterns to guide personalized revascularization.
This perspective comprehensively analyzes the invasive pullback pressure gradient (PPG), a novel physiological index that characterizes the longitudinal distribution of coronary artery disease and guides revascularization strategy modified in 14% of patients in the PPG Global Registry based on PPG assessment. We trace the historical development from subjective pullback curve analysis to a standardized, quantitative metric and describe the procedural aspects of both motorized and manual PPG acquisition. We synthesize evidence supporting PPG's clinical utility in predicting post-percutaneous coronary intervention outcomes, guiding revascularization decisions, and improving patient-centered outcomes. A central focus is PPG's mechanistic role in explaining the physiological basis of discordance between fractional flow reserve (FFR) and instantaneous wave-free ratio (iFR), linking focal disease to FFR-positive/iFR-negative patterns and diffuse disease to FFR-negative/iFR-positive patterns. We conclude that PPG represents a fundamental advancement in coronary physiology, shifting clinical focus from individual stenoses to overall disease patterns. This paradigm shift provides deeper understanding of coronary artery disease pathophysiology and offers a powerful predictive tool to guide personalized revascularization strategies. Prospective randomized trials will be essential to solidify its role as a cornerstone of modern interventional cardiology practice.
Dziewierz et al. (Fri,) studied this question.