Figure 2: Evaluation of erectile function after 4 weeks of treatment. Representative ICP curve in response to cavernous nerve electric stimulation in (a) control, (b) DMED, (c) DMED + Sil, (d) DMED + PK, and (e) DMED + Sil + PK groups. (f) MIP/MAP ratio of each group. *P < 0.05; **P < 0.005. DMED: rats with diabetes mellitus-associated erectile dysfunction; Sil: sildenafil; PK: pancreatic kininogenase; MIP: maximal intracavernous pressure; MAP: mean arterial pressure.