Section: New Results

Cardiac arrhythmia induced by mild hypothermia in vitro – a pitchfork bifurcation type process

Participants : Binbin Xu, Oriol Pont.

Reference: [20] .

The neurological damage after cardiac arrest constitutes a big challenge of hospital discharge. The mild therapeutic hypothermia (MTH) (34${}^{\circ }\mathrm{C}$ - 32${}^{\circ }\mathrm{C}$) has shown its benefit to reduce this type of damage. However, it can have many adverse effects, among which the cardiac-arrhythmia-generation-a-posteriori (CAGP) can represent up to $34\%$. Our study with a cardiac culture in vitro showed that at 35${}^{\circ }\mathrm{C}$ the CAGP can be induced. The process of MTH can be represented by a Pitchfork bifurcation, which could explain the different ratio of arrhythmia among the adverse effects after this therapy. This nonlinear dynamics suggests that a variable speed of cooling / rewarming, especially when passing 35${}^{\circ }\mathrm{C}$, would help to decrease the ratio of post-hypothermia arrhythmia and then improve the hospital output.