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Proceedings Paper

Pulmonary decontamination for photodynamic inactivation with extracorporeal illumination
Author(s): Mariana Carreira Geralde; Ilaiáli S. Leite; Natalia M. Inada; Clóvis Grecco; Alexandra I. Medeiros; Cristina Kurachi; Vanderlei S. Bagnato
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Paper Abstract

Infectious pneumonia is a major cause of morbidity and mortality, despite advances in diagnostics and therapeutics in pulmonary infections. One of the major difficulties associated with the infection comes from the high rate of antibiotic resistant microorganisms, claiming for the use of alternative techniques with high efficiency and low cost. The photodynamic inactivation (PDI) is emerging as one of the great possibilities in this area, once its action is oxidative, not allowing microorganism develops resistance against the treatment. PDI for decontamination pulmonary has potential for treatment or creating better conditions for the action of antibiotics. In this study, we are developing a device to implement PDI for the treatment of lung diseases with extracorporeal illumination. To validate our theory, we performed measurements in liquid phantom to simulate light penetration in biological tissues at various fluency rates, the temperature was monitored in a body of hairless mice and the measurements of light transmittance in this same animal model. A diode laser emitting at 810 nm in continuous mode was used. Our results show 70% of leakage at 0.5 mm of thickness in phantom model. The mouse body temperature variation was 5.4 °C and was observed light transmittance through its chest. These results are suggesting the possible application of the extracorporeal illumination using infrared light source. Based on these findings, further studies about photodynamic inactivation will be performed in animal model using indocyanine green and bacteriochlorin as photosensitizers. The pulmonary infection will be induced with Streptococcus pneumoniae and Klebsiella pneumoniae.

Paper Details

Date Published: 4 March 2014
PDF: 6 pages
Proc. SPIE 8927, Endoscopic Microscopy IX; and Optical Techniques in Pulmonary Medicine, 89271B (4 March 2014); doi: 10.1117/12.2039366
Show Author Affiliations
Mariana Carreira Geralde, Univ. de São Paulo (Brazil)
Univ. Federal de São Carlos (Brazil)
Ilaiáli S. Leite, Univ. de São Paulo (Brazil)
Natalia M. Inada, Univ. de São Paulo (Brazil)
Clóvis Grecco, Univ. de São Paulo (Brazil)
Alexandra I. Medeiros, Univ. Estadual Paulista (Brazil)
Cristina Kurachi, Univ. de São Paulo (Brazil)
Vanderlei S. Bagnato, Univ. de São Paulo (Brazil)


Published in SPIE Proceedings Vol. 8927:
Endoscopic Microscopy IX; and Optical Techniques in Pulmonary Medicine
Melissa J. Suter; Stephen Lam; Matthew Brenner; Guillermo J. Tearney; Thomas D. Wang, Editor(s)

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