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Related Experiment Videos

Time-dependent decrease of presynaptic inotropic supersensitivity: physiological evidence of sympathetic

J Koglin1, T Gross, P Uberfuhr

  • 1Medizinische Klinik I, University of Munich, Germany.

The Journal of Heart and Lung Transplantation : the Official Publication of the International Society for Heart Transplantation
|June 1, 1997
PubMed
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Heart transplant patients regain sympathetic nerve function over time, improving their response to certain catecholamines. This suggests functional reinnervation alters inotropic regulation in long-term survivors.

Area of Science:

  • Cardiology
  • Neuroscience
  • Transplantation Medicine

Background:

  • Cardiac denervation after heart transplantation impairs presynaptic neuronal uptake1 mechanisms.
  • This leads to supersensitivity to uptake1-dependent catecholamines, affecting inotropic regulation.

Purpose of the Study:

  • To investigate the restoration of sympathetic neuronal function after heart transplantation.
  • To assess changes in catecholamine sensitivity and inotropic regulation over time post-transplant.

Main Methods:

  • Compared inotropic dose-response curves in early (3-15 months) and late (23-156 months) heart transplant recipients.
  • Used isoproterenol (uptake1-independent) and epinephrine (uptake1-dependent) to assess inotropic response via echocardiography (delta P/D, delta Vcfc).

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Main Results:

  • Isoproterenol response was similar in early and late recipients, indicating stable postsynaptic beta-receptor function.
  • Epinephrine response was significantly attenuated in late recipients compared to early recipients, suggesting restored neuronal uptake.

Conclusions:

  • Findings support partial restoration of neuronal catecholamine uptake after heart transplantation.
  • This time-dependent sympathetic reinnervation is functionally important, altering inotropic effects of catecholamines in long-term survivors.