Brain death and donor heart dysfunction: implications in cardiac transplantation

Area of Science:

• Cardiovascular Physiology
• Immunology
• Transplantation Medicine

Background:

• Brain death (BD) induces complex hemodynamic, humoral, and immunological changes.
• The precise mechanisms underlying cardiac dysfunction post-BD remain incompletely understood.

Purpose of the Study:

• To systematically review the pathophysiology of perturbations following brain death.
• To elucidate the mechanisms contributing to donor heart dysfunction (DHD).
• To translate this understanding into improved clinical practices for organ transplantation.

Main Methods:

• Literature review to delineate the pathophysiology of brain death-induced derangements.
• Analysis of mechanisms affecting cardiac function after brain death.

Main Results:

• Severe alpha-adrenergic stimulation and catecholamine storm elevate pulmonary capillary pressure.
• Cytokine up-regulation, endothelial activation, and neutrophil infiltration contribute to tissue damage.
• Myocardial necrosis results from impaired calcium ATPase activity, leading to myocyte calcium overload and cell death.

Conclusions:

• Mechanisms of donor heart dysfunction (DHD) following brain death are delineated.
• Knowledge of these mechanisms can enhance donor heart suitability for transplantation.