Post-operative adhesions form as a result of normal wound healing processes following any type of surgery. In cardiac surgery, pericardial adhesions are particularly problematic during reoperations, as surgeons must release the adhesions from the surface of the heart before the intended procedure can begin, thereby substantially lengthening operation times and introducing risks of haemorrhage and injury to the heart and lungs during sternal re-entry and cardiac dissection. Here we show that a dynamically crosslinked supramolecular polymer–nanoparticle hydrogel, with viscoelastic and flow properties that enable spraying onto tissue as well as robust tissue adherence and local retention in vivo for two weeks, reduces the formation of pericardial adhesions. In a rat model of severe pericardial adhesions, the hydrogel markedly reduced the severity of the adhesions, whereas commercial adhesion barriers (including Seprafilm and Interceed) did not. The hydrogels also reduced the severity of cardiac adhesions (relative to untreated animals) in a clinically relevant cardiopulmonary-bypass model in sheep. This viscoelastic supramolecular polymeric hydrogel represents a promising clinical solution for the prevention of post-operative pericardial adhesions.
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The main data supporting the results in this study are available within the paper and its Supplementary Information. The raw and analysed datasets generated during the study are available for research purposes from the corresponding authors on reasonable request.
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This work was made possible by the financial support from the Stanford BIOX Interdisciplinary Initiatives Program Seed Grant (E.A.A. and Y.J.W.), the Stanford-Coulter Translational Research Grant (E.A.A. and Y.J.W.), the National Institutes of Health (R01HL089315-01, Y.J.W.), the American Heart Association postdoctoral fellowship (H.W. and M.J.P.) and predoctoral fellowship (L.M.S.), the National Science Foundation AGEP California Alliance Postdoctoral Fellowship (H.L.H.) and Graduate Research Fellowship Program (DGE-1147470, L.M.S., A.N.S. and G.A.), the Stanford Interdisciplinary Graduate Fellowship (L.M.S.), and the American Association for Thoracic Surgery Summer Intern Scholarship (K.M.W.). The authors thank the Bogyo laboratory for the use of the Pearl instrument, the Stanford Veterinary Services Center for assistance with ovine surgeries and the Stanford Animal Histology Services for assistance with histology.
The authors declare no competing interests.
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Supplementary figures and video captions.
An untreated heart in a rodent pericardial-adhesion model
Seprafilm-treated heart in a rodent pericardial-adhesion model
Interceed-treated heart in a rodent pericardial-adhesion model
PNP-2:10-hydrogel-treated heart in a rodent pericardial-adhesion model
PNP-1:10-hydrogel-treated heart in a rodent pericardial-adhesion model
PNP-1:5-hydrogel-treated heart in a rodent pericardial-adhesion model
PNP-1:1-hydrogel-treated heart in a rodent pericardial-adhesion model
PNP-0.2:10-hydrogel-treated heart in a rodent pericardial-adhesion model
Spraying the PNP-1:10-hydrogel treatment onto the epicardial surface following epicardial abrasion