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Right ventricular function after brain death: response to an increased afterload

G Szabó1, C Sebening, C Hagl

  • 1Department of Cardiac Surgery, University of Heidelberg, Germany. szabo@novsrv1.pio1.uni-heidelberg.de

European Journal of Cardio-Thoracic Surgery : Official Journal of the European Association for Cardio-Thoracic Surgery
|June 26, 1998
PubMed
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Brain death does not acutely impair right ventricular (RV) function. Following brain death, the RV adapts to increased afterload primarily through the Frank-Starling mechanism, maintaining pump function.

Area of Science:

  • Cardiology
  • Physiology
  • Transplantation

Background:

  • Right ventricular (RV) failure is a significant cause of mortality post-cardiac transplantation.
  • RV failure is linked to the donor RV's inability to manage the recipient's high pulmonary vascular resistance.

Purpose of the Study:

  • To investigate the acute effects of brain death on RV function.
  • To assess the RV's adaptive capacity to increasing afterload.

Main Methods:

  • Brain death was induced in anesthetized dogs using a subdural balloon catheter.
  • Hemodynamic parameters and RV pressure-length loops were recorded.
  • Pulmonary artery constriction progressively increased RV afterload.

Main Results:

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  • Brain death initially caused a hypercontractile RV state, followed by a return to baseline.
  • With increased afterload, RV end-diastolic pressure rose significantly more in the brain death group.
  • Despite differences in adaptation mechanisms, global RV pump function (cardiac output, stroke work) remained comparable between groups.

Conclusions:

  • Brain death itself does not lead to acute impairment of RV function.
  • The RV adapts to increased afterload post-brain death via the Frank-Starling mechanism.
  • Control animals utilized both homeometric and heterometric regulation for afterload adaptation.