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Patients with prior stroke show mitochondrial dysfunction before LVAD implantation. This dysfunction, measured by oxidative phosphorylation proteins, may predict new strokes after CF-LVAD surgery.

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Area of Science:

  • Cardiology
  • Neurology
  • Mitochondrial Biology

Background:

  • Stroke is a significant risk in advanced congestive heart failure (CHF) patients receiving continuous-flow left ventricular assist devices (CF-LVADs).
  • Mitochondrial oxidative phosphorylation (OxPhos) abnormalities are linked to neurodegeneration and cerebral ischemia.

Purpose of the Study:

  • To investigate if prior stroke is associated with systemic mitochondrial OxPhos abnormalities in CF-LVAD patients.
  • To determine if these abnormalities are more pronounced in patients at risk for new strokes post-implantation.

Main Methods:

  • Studied 50 CF-LVAD patients (25 with prior stroke, 25 without).
  • Measured OxPhos complex proteins (C.I-C.V) in blood leukocytes pre- and post-CF-LVAD implantation.
  • Utilized machine learning (LASSO, Random Forest) for stroke prediction modeling.

Main Results:

  • The prior-stroke group exhibited significantly lower levels of OxPhos proteins (C.I, C.II, C.IV, C.V) compared to the no-prior-stroke group, both pre- and post-CF-LVAD.
  • OxPhos proteins further decreased in the prior-stroke group post-CF-LVAD.
  • Machine learning models identified six prognostic factors, achieving an AUC of 0.93 for predicting postoperative stroke.

Conclusions:

  • Mitochondrial dysfunction, indicated by peripheral OxPhos protein reduction, exists in CHF patients with prior ischemic stroke even before CF-LVAD implantation.
  • Reduced OxPhos protein expression may serve as a predictive biomarker for new strokes following CF-LVAD implantation.