Figure 6.

Polypyrrole-chitosan injection promotes electrical signal conductivity in cryoinjured myocardial tissue. (A) An electromyograph (EMG) recorder was used to measure propagation of generated electrical pulses across a cryoinjury-induced myocardial scar in the presence or absence of chitosan (CHI) or polypyrrole-chitosan (PPY:CHI) biomaterials. (B) Average voltage was significantly elevated in scar tissue injected with PPY:CHI compared with scar tissue that received CHI or saline (n = 4, * p < 0.05). (C) Representative tracings of measured electrical signal are presented. Data are shown as mean ± SEM.