Figure 5.

Polypyrrole-chitosan injection decreases QRS duration. (A) Electrocardiogram (ECG) measurements were taken from cryoinjured hearts prior to injection of saline, chitosan (CHI), or polypyrrole-chitosan (PPY:CHI) 1 week post-injury or at 28 days post-injection (5 weeks post-injury). QRS complex duration was examined and quantified (B) Cyroinjury resulted in significant prolongation of the QRS complex in rats at 1 week post-injury. Injection of PPY:CHI significantly decreased QRS complex duration in injured hearts, whereas CHI and saline injection did not affect QRS complex duration (n = 4 for each group; * p < 0.05). Data are shown as mean ± SEM.