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Photobiomodulation (PBM), formerly known as low-level laser therapy (LLLT), is a non-invasive, non-thermal medical treatment that uses red (620–700 nm) and near-infrared (700–1100+ nm) light to stimulate cellular repair, reduce inflammation, and alleviate pain.
Mechanism of Action
Mechanism of Action
Cellular Absorption: Photons from red and near-infrared light are absorbed by endogenous photoreceptors, primarily mitochondrial cytochrome c oxidase (COX).
Biological Cascade: This absorption triggers a chain of events including increased ATP production, generation of reactive oxygen species (ROS), and release of nitric oxide (NO).
Therapeutic Outcomes: These changes enhance cellular metabolism, improve blood circulation, modulate inflammation, and promote tissue regeneration without heating or damaging tissue.
Clinical Applications
Clinical Applications
PBM is utilized across various medical fields for its ability to accelerate healing and manage pain:
Dermatology: Treatment of wound healing (including diabetic ulcers and surgical incisions), skin regeneration, and conditions like oral mucositis caused by cancer therapies.
Pain Management: Relief for acute and chronic pain, including arthritis, tendinopathies, and musculoskeletal injuries.
Ophthalmology: Emerging applications for dry eye disease (by stimulating meibomian glands) and potential support for age-related macular degeneration (AMD).
Neurology: Investigational uses for traumatic brain injury (TBI), Alzheimer’s, and Parkinson’s disease to improve cognition and brain connectivity, though evidence remains early-stage.
Efficacy and Considerations
Efficacy and Considerations
Device Types: Therapy utilizes lasers, LEDs, or broadband light sources, with Class IV lasers offering deeper penetration due to higher power.
Critical Parameters: Effectiveness depends on precise wavelength, irradiance (power density), and fluence (energy dose); incorrect dosing can render treatment ineffective.
Safety: PBM is generally well-tolerated with minimal side effects, such as temporary erythema. It is distinct from photodynamic therapy and intravenous light therapies, which are not supported by mainstream evidence.
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