Even at relatively low doses of DEHP, cardiovascular reactivity was significantly affected in mice. A clinically relevant dose and duration of exposure to DEHP has been shown to have a significant impact on the behavior of cardiac cells in culture. This includes an uncoupling effect that leads to irregular rhythms in vitro. Untreated cells had fast conduction velocity, along with homogenous activation wave fronts and synchronized beating. Cells treated with DEHP exhibited fractured wave fronts with slow propagation speeds. This is observed in conjunction with a significant decrease in the amount of expression and instability of gap junctional connexin proteins, specifically connexin-43, in cardiomyocytes treated with DEHP.