Background: Bleomycin sclerotherapy is ineffective for treating capillary malformations (CMs) because bleomycin cannot adequately be injected into the small-diameter capillary lumina. Electrosclerotherapy (EST) might be a new treatment modality for CMs, as it combines bleomycin sclerotherapy and "electroporation"-an electric field applied to the tissue. Electroporation disrupts the transmembrane potential, facilitating bleomycin transportation across the vessel wall, hypothetically leading to targeted drug delivery and increased effectiveness of bleomycin in CMs.
Objective: To explore the efficacy, safety, and feasibility of EST for CMs in a randomized within-patient controlled pilot study.
Materials and methods: Fifteen regions of interest (ROI) within the hypertrophic CMs of 5 patients were randomly allocated to EST, bleomycin injection, or no treatment. Outcome was assessed after 7 weeks by the patient and a blinded outcome assessor using the patient-observer scar assessment score (POSAS), global assessment of change (GAC), colorimetry, and laser speckle contrast imaging.
Results: Color and hypertrophy of all ROIs treated with EST significantly improved, based on the POSAS (medians patient -11; observer -13), GAC, and colorimetry (ΔE 3.4-16.5) scores.
Conclusion: This pilot study demonstrates the first proof of concept for electrosclerotherapy as a new treatment modality for CMs. Further research is warranted.
Trial registration: ClinicalTrials.gov NCT02883023.