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Updated: Sep 16, 2025

Increasing Pulmonary Artery Pulsatile Flow Improves Hypoxic Pulmonary Hypertension in Piglets
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Pulsatile flow dynamics determine pulmonary arterial architecture.

Stephen Spurgin1,2, Lauren Thai2, Tina Wan3,4

  • 1Department of Molecular Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, Texas, USA 75390.

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|July 9, 2025
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Summary
This summary is machine-generated.

Loss of arterial pulsatility after Glenn surgery in single ventricle heart disease alters pulmonary artery structure. This study reveals pulsatile stretch is key for maintaining vascular health via endothelial-smooth muscle cell communication.

Keywords:
GlennPDGFBbiomechanical forcecongenital heart diseaseendothelial cellhemodynamicsmousemural cellpulsatilityratsingle ventricle

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Area of Science:

  • Cardiovascular Research
  • Pediatric Cardiology
  • Vascular Biology

Background:

  • Single ventricle congenital heart disease (SV-CHD) is a fatal condition without surgical palliation.
  • The Glenn procedure creates a circulation lacking cardiac-driven pulsatility, leading to pulmonary vascular complications.
  • The cellular impact of pulsatility loss in the pulmonary arteries of SV-CHD patients remains uninvestigated.

Purpose of the Study:

  • To define and quantify pulsatility loss in the pulmonary arteries of SV-CHD patients undergoing Glenn surgery.
  • To investigate the cellular and molecular responses of endothelial cells (ECs) to altered hemodynamic forces.
  • To elucidate the role of arterial pulsatility in maintaining pulmonary vascular architecture.

Main Methods:

  • Combined cardiac catheterization and MRI were used to assess pulsatility in Glenn patients.
  • Cultured human pulmonary artery ECs were exposed to individual dimensions of hemodynamic force (flow, pressure, stretch).
  • Bulk RNA sequencing, GSEA, ELISA, immunofluorescence, and a rat Glenn circulation model were employed.

Main Results:

  • Pulsatility loss was quantified across flow, pressure, and stretch in Glenn patients.
  • Distinct transcriptional signatures were observed in ECs exposed to different pulsatility dimensions.
  • Pulsatile stretch was identified as crucial for PDGFB secretion, promoting vascular smooth muscle cell (vSMC) recruitment and proliferation, while pulsatility loss led to vascular wall thinning and reduced VSMCs.

Conclusions:

  • Blood flow pulsatility is critical for maintaining pulmonary vascular architecture.
  • A novel mechanism of EC-SMC crosstalk mediated by pulsatile stretch and PDGFB is identified.
  • Arterial pulsatility is sensed by ECs and relayed to VSMCs, preserving vascular structure essential for hemodynamic support.