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In Glenn patients, we quantified pulsatility loss in each dimension of force (flow, pressure, and stretch) using cardiac catheterization and MRI. To model and investigate the individual impact of each dimension of pulsatility loss on the pulmonary vasculature, we applied isolated pulsatile and non-pulsatile mechanical stimuli to pulmonary artery endothelial cells (ECs) in vitro. We found that each dimension of force triggered distinct transcriptional responses, revealing force-specific regulation of structural and signaling pathways. Pulsatile stretch uniquely stimulated EC secretion of PDGFB, a key driver of vascular smooth muscle cell (vSMC) recruitment. In a rat Glenn model, loss of pulsatility led to vascular wall thinning, loss of EC PDGFB, and reduced activation of smooth muscle PDGFBR\u03b2, confirming in vivo relevance. 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