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Related Experiment Video

Updated: May 9, 2026

Method for the Assessment of Effects of a Range of Wavelengths and Intensities of Red/near-infrared Light Therapy on Oxidative Stress In Vitro
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Method for the Assessment of Effects of a Range of Wavelengths and Intensities of Red/near-infrared Light Therapy on Oxidative Stress In Vitro

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Low-level laser therapy accelerates collateral circulation and enhances microcirculation.

F R Mohammed Ihsan1

  • 1Department of Anatomy, AL-Kindy College of Medicine, University of Baghdad, Iraq.

Photomedicine and Laser Surgery
|June 16, 2005
PubMed
Summary
This summary is machine-generated.

Low-level laser therapy (LLLT) effectively promotes collateral circulation and microcirculation in occluded blood vessels. This treatment accelerates healing and normalizes function in injured vascular tissue.

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Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Vascular Biology

Background:

  • Previous treatments like prostaglandin and ultrasound therapy aimed to improve vascular beds in injured, occluded tissues.
  • These methods sought to enhance blood supply to tissue deprived of circulation due to vessel injury.

Purpose of the Study:

  • To evaluate the efficacy of low-level laser therapy (LLLT) in improving collateral circulation and microcirculation.
  • To assess LLLT's impact on vascular function following blood vessel occlusion.

Main Methods:

  • Thirty-four rabbits underwent femoral artery ligation, with one group receiving daily LLLT (904 nm, 10 mW) for 3 days post-surgery.
  • Blood and tissue samples were analyzed for adenosine, growth hormone (GH), fibroblast growth factor (FGF), fiber/capillary ratio, and capillary diameter.
  • Measurements were taken at multiple time points up to 72 hours postoperatively.

Main Results:

  • LLLT treatment led to rapid increases in adenosine, GH, and FGF levels.
  • The fiber/capillary ratio and capillary diameter peaked at 12-16 hours post-treatment, returning to normal by 72 hours.
  • Significant proliferation of collateral blood vessels and increased diameter of existing vessels were observed in the LLLT group.

Conclusions:

  • LLLT significantly accelerates collateral circulation and enhances microcirculation in an animal model of vascular occlusion.
  • The therapy demonstrated a unique ability to normalize the functional characteristics of injured vascular tissue.
  • LLLT shows promise for treating conditions involving blood vessel occlusion and impaired circulation.