Background
Pain during topical aminolevulinic acid (ALA) mediated photodynamic therapy (PDT) limits the use of this treatment of skin diseases.
Objective
To summarize the effectiveness of interventions to reduce ALA-PDT related pain, and to explore factors contributing to pain induction.
Methods
A PubMed search was performed to identify all clinical PDT trials (2000–2008) that used ALA or methyl-ALA, enrolled at least 10 patients per trial, and used a semiquantitative pain scale.
Results
43 papers were identified for review. Pain intensity is associated with lesion size and location and can be severe for certain diagnoses, such as plaque-type psoriasis. Results are inconsistent for the correlation of pain with light source, wavelength of light, fluence rate, and total light dose. Cooling represents the best topical intervention.
Limitations
Pain perception differs widely between patients and can contribute to variability in the reported results.
Conclusion
GABA receptors, cold/ menthol receptors (TRPM8), and vanilloid/capsaicin receptors (TRPV1) may be involved in pain perception during ALA-PDT and are therefore worthy of further investigation.