“…Studies conducted by others have provided valid values for gradients across various types of prosthetic valve. [4][5][6][7][8] In our study, the peak and mean gradients measured across TTK Chitra valves in aortic position were 33.8 AE 19.6 and 21.9 AE 11.2 mm Hg, 27.2 AE 10.5 and 16.5 AE 7.1 mm Hg, and 19.1 AE 0.9 and 8.9 AE 0.9 mm Hg for sizes 19, 21, and 23, respectively. For sizes 25, 27, 29, and 31 in the mitral position, the gradients were 18.7 AE 7.1 and 7.9 AE 4.5 mm Hg, 13.8 AE 6.2 and 5.4 AE 2.5 mm Hg, 9.5 AE 3.3 and 4.3 AE 0.9 mm Hg, and 6.3 AE 1.9 and 3.0 AE 0.7 mm Hg, respectively.…”