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Elevated perfusate [Na+] increases contractile dysfunction during ischemia and reperfusion.

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  • 1Translational Biology, Medicine, and Health Graduate Program, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA.

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Summary
This summary is machine-generated.

Elevating perfusate sodium concentration ([Na+]o) to 155 mM negatively impacts cardiac mechanical function during baseline, ischemia, and reperfusion. This effect is mediated by the sodium-calcium exchanger (NCX).

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Area of Science:

  • Cardiovascular Physiology
  • Cardiac Electrophysiology
  • Myocardial Metabolism

Background:

  • Perfusate sodium concentration ([Na+]o) influences cardiac electrical stability and contractility via the sodium-calcium exchanger (NCX).
  • The impact of altered [Na+]o on cardiac mechanical function during ischemia-reperfusion remains unclear.

Purpose of the Study:

  • To investigate the effects of perfusate sodium concentration (145 mM vs. 155 mM) on cardiac mechanical function in isolated rat hearts during baseline, ischemia, and reperfusion.

Main Methods:

  • Isolated rat hearts were perfused using the Langendorff preparation.
  • Hearts were subjected to global ischemia and reperfusion.
  • Cardiac mechanical function was assessed by measuring left-ventricular developed pressure (LVDP).
  • The role of the sodium-calcium exchanger (NCX) was evaluated using the inhibitor SEA0400.

Main Results:

  • Increasing [Na+]o from 145 mM to 155 mM significantly reduced baseline LVDP.
  • Higher [Na+]o accelerated the onset of ischemic contracture.
  • NCX inhibition with SEA0400 abolished the negative inotropic effect of increased [Na+]o at baseline and prolonged time to ischemic contracture.
  • Reperfusion with 155 mM [Na+]o further depressed mechanical function.

Conclusions:

  • Modest increases in perfusate sodium concentration (10 mM) significantly impair cardiac mechanical function under normal and stress conditions.
  • The sodium-calcium exchanger plays a critical role in mediating these effects.
  • Clinical use of high-sodium solutions like Normal Saline during cardiac ischemia warrants further investigation.