Structural and Histochemical Alterations in the Aortic Valves of Elderly Patients: A Comparative Study of Aortic Stenosis, Aortic Regurgitation, and Normal Valves

Figure 4

Speed of sound change after protease ((a) collagenase, (b) pepsin) digestion. Values represent the mean and SD ( and 30 points for the AS and AR groups of (a), resp., and 70 points for the AS and AR groups of (b), resp.). Significantly different from the SOS values at 0 h (, ; Tukey-Kramer test). Precise data are available in the Supplementary Table  S2 in Supplementary Material available online at http://dx.doi.org/10.1155/2016/6125204.

(a)

(b)