LDF assessment of tumor blood flow and flux motions in photodynamic therapy

In patients with basal cell carcinoma (BCC) skin microcirculation was measured by the laser Doppler flowmeter (LDF). Spectral analysis of LDF-signal based on fast Fourier transform enables us to evaluate an amplitude and predominated frequency of flux motions in the next diapasons: α-rhythm (1-3 cycles/rain, or min-1), β-rhythm (4-8 min-1), γ-rhythm (9-11 min-1), high-frequency rhythm (HF 12-30 min-1) and cardiorhythm (CF - 50-90 min-1). For photodynamic therapy (PDT) hematoporphyrin derivative was administrated intravenously in dosage 1-2 mg/Kg. In 24 hours after that all patients were exposed to the red laser irradiation (0.67 μm) in dose 200-300 J/cm2. The microcirculation level in BCC was higher than in the plots of healthy skin (13.1±1.18 a.u. against 8.1±0.96 a.u. respectively, p<0.01). Exactly after PDT the marked decrease of microcirculation up to 4.7±0.63 a.u. associated with photoinduced stasis took place in the tumor. Spectral analysis of flux motions demonstrated a significant inhibition of α-, β-rhythms and amplification of HF- and CF-rhythm. In 1 week after PDT we observed a gradual restoration of microcirculation in the zone of PDT skin injury that followed a wound healing process.

Authors
Language
English
Pages
18-24
Status
Published
Volume
2982
Year
1997
Organizations
  • 1 Russian Univ. of Peoples' Friendship, Anatomy Cathedra, Medical Faculty, Miklukho-Maklava Str. 6, Moscow 117198, Russian Federation
Keywords
Basal cell carcinoma; Flux motions; Laser Doppler flowmetry; Photodynamic therapy; Skin microcirculation
Date of creation
19.10.2018
Date of change
19.10.2018
Short link
https://repository.rudn.ru/en/records/article/record/707/