[Pathophysiology of chronic myocardial ischemia]

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C Jacobshagen1, L S Maier

  • 1Abteilung Kardiologie und Pneumologie, Herzzentrum, Georg-August-Universität Göttingen, Robert-Koch-Strasse 40, Göttingen, Germany.

Herz
|April 23, 2013
PubMed

Insights

Myocardial ischemia, often caused by coronary artery disease (CAD), persists in many patients despite treatments like bypass surgery (CABG) or angioplasty (PCI). Cellular changes involving sodium and calcium overload worsen this condition, impacting heart function.

Area of Science:

  • Cardiology
  • Cellular Biology
  • Pathophysiology

Context:

  • Myocardial ischemia results from an imbalance in oxygen supply and demand.
  • Obstructive coronary artery disease (CAD) is a primary cause, yet many patients experience persistent angina post-treatment (CABG, PCI).
  • Non-obstructive causes like small vessel disease and endothelial dysfunction are not addressed by revascularization therapies.

Purpose:

  • To elucidate the cellular mechanisms underlying myocardial ischemia.
  • To explain the role of the late sodium current (I Na, late) and sodium/calcium exchanger (NCX) in ischemia.
  • To connect cellular events to macroscopic consequences like increased diastolic wall tension and compromised microcirculation.

Summary:

  • Myocardial ischemia triggers an increase in the late sodium current (I Na, late), leading to intracellular sodium overload.
  • This sodium overload reverses the sodium/calcium exchanger (NCX), causing calcium influx and overload.
  • Calcium overload activates contractile myofilaments, increasing diastolic wall tension, impairing microcirculation, and exacerbating ischemia.

Impact:

  • Provides a cellular-level understanding of myocardial ischemia progression.
  • Highlights the limitations of current CAD revascularization therapies for certain patient groups.
  • Offers insights into potential therapeutic targets for managing chronic myocardial ischemia beyond revascularization.

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