Nidhi Singh, Lothar Lilge
Journal of Biomedical Optics, Vol. 30, Issue 03, 030901, (February 2025) https://doi.org/10.1117/1.JBO.30.3.030901
TOPICS: Photons, Wound healing, Picosecond phenomena, Microorganisms, Bacteria, In vitro testing, Pathogens, In vivo imaging, Oxygen, Tissues
Significance
Chronic or surgical wound infections in healthcare remain a worldwide problem without satisfying options. Systemic or topical antibiotic use is an inadequate solution, given the increase in antimicrobial-resistant microbes. Hence, antibiotic-free alternatives are needed. Antimicrobial photodynamic inactivation (aPDI) has been shown to be effective in wound disinfection. Among the impediments to the wide utility of aPDI for wounds is the high variability in reported photosensitizer and light dose to be effective and unintentional detrimental impact on the wound closure rates. Additionally, the time required by the healthcare professional to deliver this therapy is excessive in the present form of delivery.
Aim
We reviewed the dose ranges for various photosensitizers required to achieve wound disinfection or sterilization while not unintentionally inhibiting wound closure through concomitant photobiomodulation (PBM) processes.
Approach
To allow comparison of aPDI or PBM administered doses, we employ a unified dose concept based on the number of absorbed photons per unit volume by the photosensitizer or cytochrome C oxidase for aPDI and PBM, respectively.
Results
One notes that for current aPDI protocols, the absorbed photons per unit volume for wound disinfection or sterilization can lead to inhibiting normal wound closure through PBM processes.
Conclusion
Options to reduce the dose discrepancy between effective aPDI and PBM are discussed.
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