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Recovery of limb perfusion and function after hindlimb ischemia is impaired by arterial calcification

Sara L Zettervall1, Xue-Lin Wang1, Stephanie Monk1

  • 1Division of Vascular and Endovascular Surgery, Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA.

Physiological Reports
|August 18, 2021
PubMed

Insights

Medial artery calcification impairs blood flow recovery after limb ischemia in rats. This vascular condition, common in peripheral artery disease (PAD), worsens outcomes and highlights the need to manage arterial calcification.

Area of Science:

  • Vascular Biology and Medicine
  • Cardiovascular Research
  • Regenerative Medicine

Background:

  • Medial artery calcification involves calcium hydroxyapatite deposition and osteogenic changes in vascular smooth muscle cells.
  • It is prevalent in chronic kidney disease, diabetes, and peripheral artery disease (PAD), correlating with higher amputation rates in lower extremities.
  • The impact of medial calcification on tissue perfusion and functional recovery following acute limb ischemia is not fully understood.

Purpose of the Study:

  • To investigate the effects of medial artery calcification on hindlimb perfusion and functional recovery after induced ischemia in a rat model.
  • To elucidate the role of medial calcification in the pathophysiology of acute limb ischemia.

Main Methods:

  • Medial artery calcification was induced using vitamin D3 (VitD3) injection in rats.
  • Acute limb ischemia was simulated via femoral artery ligation.
  • Laser Doppler perfusion imaging, histological analysis, and hemodynamic assessments were employed to evaluate outcomes.

Main Results:

  • VitD3-induced medial calcification significantly impaired perfusion recovery post-ischemia compared to controls.
  • Rats with medial calcification exhibited worse ischemia scores and delayed functional recovery.
  • Increased arterial stiffness was observed in VitD3-injected rats, while cardiac function remained preserved.

Conclusions:

  • Medial artery calcification contributes to impaired perfusion recovery in acute limb ischemia, potentially by altering vascular compliance.
  • Despite preserved capillary density and muscle morphology, functional deficits were evident.
  • Slowing or reducing arterial calcification may improve clinical outcomes for patients with PAD.

Keywords:
arterial calcificationhindlimb ischemiavascular smooth muscle cells

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