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(a) Ultimate tensile strength of ETTs with varying amounts of plasticizer added to the swelling solution (0%, 1%, 1.5%, 2% added) at the breakpoint. (b) Ultimate tensile strength of ETTs with different concentrations of SNAP added to a swelling solution containing 2% TOTM in solution (20, 40, and 60 mg/ml added) at the breakpoint. Both measured by Instron tensile strength instrument. ETT, endotracheal tube; SNAP, S-nitroso-N-acetylpenicillamine; TOTM, trioctyl trimellitate
