scholarly journals Photodynamic Therapy With Methylene Blue for Skin Ulcers Infected With Pseudomonas aeruginosa and Fusarium spp.

2017 ◽  
Vol 108 (6) ◽  
pp. e45-e48 ◽  
Author(s):  
C. Aspiroz ◽  
M. Sevil ◽  
C. Toyas ◽  
Y. Gilaberte
Keyword(s):  
Methylene Blue ◽  
Pseudomonas Aeruginosa ◽  
Photodynamic Therapy ◽  
Fusarium Spp ◽  
Skin Ulcers

scholarly journals Antimicrobial effect of methylene blue formulations with oxygen carrier at different pHs: preliminary study

2019 ◽  
Vol 22 (1) ◽  
pp. Process
Author(s):  
Jessica Klöckner Knorst ◽  
Gabriela Scarton Barriquello ◽  
Marcos Antônio Villetti ◽  
Roberto Christ Vianna Santos ◽  
Karla Zanini Kantorski
Keyword(s):  
Methylene Blue ◽  
Pseudomonas Aeruginosa ◽  
Photodynamic Therapy ◽  
Oxygen Carrier ◽  
Statistical Significance ◽  
Antimicrobial Effect ◽  
Control Group ◽  
Preliminary Study ◽  
Post Hoc ◽  
Multispecies Biofilms

Objective: Evaluate methylene blue (MB) formulations containing oxygen carrier at different pHs in antimicrobial photodynamic therapy (aPDT). Material and Methods: Biofilms of Pseudomonas aeruginosa PA01 formed over acrylics specimens during five days were treated with aPDT using different formulations: MB/pH 7.4; MB/pH 5.6; MB/carrier pH 7.4; MB/carrier pH 5.6. Biofilms not exposed to treatment were used as a control. Blind examiner for the experimental groups performed the counting of colonies per ml suspension (CFU/ml). Two-way ANOVA was used to determine the effect of factors solvent (carrier vs water) and pH (7.4 vs 5.6). One-way ANOVA and post-hoc Tukey’s test was used to evaluate differences among the five groups (control; MB/carrier pH 7.4; MB pH 7.4; MB/carrier pH 5.6; MB pH 5.6). The Statistics 8.0 software was used (P<0.05). Results: All of photodynamic therapy groups showed significant reduction in P. aeruginosa compared to the control group. The solvent factor was not significant (P=0.18), while the pH factor presented statistical significance (P=0.01). When the carrier was used, MB formulation at pH 7.4 presented a statistically greater reduction of P. aeruginosa than the formulation with pH 5.6. Conclusion: The PDT using methylene blue formulations with oxygen carrier demonstrated potential for the treatment of localized infections by P. aeruginosa. MB formulations with oxygen carrier and pH 7.4 resulted in higher antimicrobial effect and should be considered for future studies with multispecies biofilms.  KeywordsAntimicrobial photodynamic therapy; biofilm; laser; Pseudomonas aeruginosa.

Photodynamic therapy using methylene blue, combined or not with gentamicin, against Staphylococcus aureus and Pseudomonas aeruginosa

2020 ◽  
Vol 31 ◽  
pp. 101810
Author(s):  
Vanesa Pérez-Laguna ◽  
Isabel García-Luque ◽  
Sofía Ballesta ◽  
Luna Pérez-Artiaga ◽  
Verónica Lampaya-Pérez ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Methylene Blue ◽  
Pseudomonas Aeruginosa ◽  
Photodynamic Therapy

Open study of photodynamic therapy for skin ulcers infected with MRSA and Pseudomonas aeruginosa

2021 ◽  
pp. 102484
Author(s):  
Miyu Shiratori ◽  
Toshiyuki Ozawa ◽  
Nobuhisa Ito ◽  
Kunio Awazu ◽  
Daisuke Tsuruta
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Photodynamic Therapy ◽  
Open Study ◽  
Skin Ulcers

scholarly journals The ineffectiveness of antimicrobial photodynamic therapy in the absence of preincubation of the microorganisms in the photosensitizer

2020 ◽  
Vol 33 ◽  
Author(s):  
Ítalo Dany Cavalcante Galo ◽  
Jéssica Assis Carvalho ◽  
Jessyca Luana Melo Costa Santos ◽  
Alexandre Braoios ◽  
Rodrigo Paschoal Prado
Keyword(s):  
Staphylococcus Aureus ◽  
Methylene Blue ◽  
Pseudomonas Aeruginosa ◽  
Photodynamic Therapy ◽  
Laser Emission ◽  
Alternative Therapy ◽  
Antimicrobial Photodynamic Therapy ◽  
Essential Factor ◽  
Multiresistant Bacteria ◽  
Important Objective

Abstract Introduction: Considering its potential as an alternative therapy to combat multiresistant bacteria, photodynamic therapy has been improved and better studied in recent years, and determining its optimized application patterns is important. Objective: This study aimed to evaluate the action of antimicrobial photodynamic therapy mediated by methylene blue in the absence of preincubation of infectious agents in the photosensitizer. Method: Standard strains of Staphylococcus aureus and Pseudomonas aeruginosa were used, which was or was not submitted to two methylene blue concentrations (0.1 μg/mL and 500 mg/mL) applied alone or in combination with a variety of red laser emission parameters (660 nm); in both cases, the streak was performed immediately after mixing between the photosensitizer and the solution containing the bacteria. Results: In the dishes with only methylene blue application neither antibacterial was produced, nor inhibition at the application points of the photodynamic therapy in the case of the bacterium Pseudomonas aeruginosa. However, in the cultures of Staphylococcus aureus in which laser emission was associated with the concentration of 500 mg/mL of the photosensitizer, inhibition was present at the laser application points. Conclusion: The time of exposure to the photosensitizer prior to the application of phototherapy seems to be an essential factor for the optimized action of photodynamic therapy, especially in the case of Gram-negative bacteria.

scholarly journals An Eschar-like souvenir from a journey to Colombia: Ecthyma gangrenosum as a differential diagnosis of tropical diseases in immunocompromised patients – a case report

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Gabriela M. Wiedemann ◽  
Jochen Schneider ◽  
Mareike Verbeek ◽  
Björn Konukiewitz ◽  
Christoph D. Spinner ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Differential Diagnosis ◽  
Antibiotic Treatment ◽  
Partial Remission ◽  
Combined Treatment ◽  
Lymphocytic Leukemia ◽  
Entire Body ◽  
Tropical Diseases ◽  
Ecthyma Gangrenosum ◽  
Skin Ulcers

Abstract Background Ecthyma gangrenosum (EG) is a cutaneous infectious disease characterized by eschar-like skin ulcers typically caused by Pseudomonas aeruginosa. Here, we report a case of relapsing EG in a patient who had returned from a trip to Colombia, thus establishing EG as an important differential diagnosis of tropical diseases, and demonstrating that even long-term antibiotic treatment can result in only partial remission of EG. Case presentation A 77-year-old man with underlying chronic lymphocytic leukemia (CLL) on ibrutinib treatment was admitted because of a superinfected mosquito bite on the left ear and multiple partially necrotic skin lesions disseminated all over the entire body five days after returning from a trip to Colombia. The initial clinical suspicion of a tropical disease (leishmaniosis, systemic mycosis, or others) could not be confirmed. During the diagnostic workup, microbiological cultures of the skin biopsies and bronchoalveolar lavage revealed Pseudomonas aeruginosa, leading to a diagnosis of EG. Initial antibiotic treatment resulted in partial remission. However, the patient had to be re-admitted due to a relapse 3–4 weeks after the first episode. Finally, the patient was successfully treated with a combined approach consisting of antibiotics, recurrent surgical incisions, and administration of immunoglobulins. Conclusions In conclusion, EG should be considered as a differential diagnosis in immunosuppressed patients presenting with eschar-like skin ulcers. A combined treatment approach seems to be the best choice to achieve clinical cure and avoid relapse.

Sign in / Sign up

Export Citation Format

Share Document