Aortopulmonary anastomoses were created in 36 piglets to determine whether an encircling ring of heavy silk would limit excessive growth. When an unbanded anastomosis remained patent, it grew to a large size. When the anastomosis was banded by an encircling ring of heavy silk, growth was controlled in all but one pig.
Trusler GA, Kanzaki Y. Controlling the Growth of: Aortopulmonary Anastomoses in Piglets. Arch Surg. 1973;106(1):72–74. doi:10.1001/archsurg.1973.01350130074016
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