scholarly journals Pseudomonas aeruginosa Infectious Keratitis in a High Oxygen Transmissible Rigid Contact Lens Rabbit Model

2014 ◽  
Vol 55 (9) ◽  
pp. 5890 ◽  
Author(s):  
Cynthia Wei ◽  
Meifang Zhu ◽  
W. Matthew Petroll ◽  
Danielle M. Robertson
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Contact Lens ◽  
Rabbit Model ◽  
High Oxygen ◽  
Infectious Keratitis ◽  
Rigid Contact

scholarly journals Visual Outcome, Microbiological Profile and Antibiotic Sensitivity of Infectious Keratitis in a Tertiary Referral Center

2020 ◽  
Author(s):  
Kristina Moore Stanfield ◽  
Bo Huang ◽  
Blake Matherne ◽  
Osasu Adah ◽  
Daniel McClung ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Contact Lens ◽  
Antibiotic Sensitivity ◽  
Empirical Therapy ◽  
Visual Outcome ◽  
Corneal Transplant ◽  
Infectious Keratitis ◽  
Tertiary Referral Center ◽  
Infection Source

Abstract Purpose:Treatment of infectious keratitis is chosen by identification of infection source with associated antibiotic susceptibilities. Because culturing corneas may take days to weeks to result, the mainstay of treatment is empirical therapy with broad-spectrum antimicrobials that are started before culture results return. We aim to record the microbiological profiles with associated antibiotic susceptibility patterns isolated from corneal cultures in patients with infectious keratitis, as well as visual outcomes over a 5-year period.Methods:A retrospective analysis of medical records of patients who presented to UMMC from 1/1/2014 to 12/31/2018 with keratitis or corneal ulcer were included in this study based off diagnosis codes.Results:Of 563 corneal infections analyzed, 202 (35.9%) had positive cultures. The most frequently isolated organism was Coagulative negative Staphylococcus/Staphylococcus epidermidis, followed by Pseudomonas aeruginosa, and Staphylococcus aureus. Pseudomonas aeruginosa was isolated in 37.2% contact lens wearers. We found that 93.3% of gram-positive cultured bacteria were susceptible to vancomycin with no resistance, and 81.8% of gram-negative bacteria were highly susceptible to tobramycin with no resistance. Regardless of treatment, 19.8% of patients needed some type of additional procedure, with the most common procedures being corneal transplant & evisceration. Conclusion:CNS, Pseudomonas aeruginosa, and Staphylococcus aureus were the most common microbes causing infectious keratitis. Pseudomonas aeruginosa remains the most commonly identified organism in contact lens wears. The empirical treatment of vancomycin and tobramycin used at our institution remains an excellent treatment for these microbes.

On the art and science of rigid contact lens fitting

2021 ◽  
pp. 1-7
Author(s):  
Nathan Efron ◽  
Lyndon W Jones ◽  
Philip B. Morgan ◽  
Jason J. Nichols
Keyword(s):  
Contact Lens ◽  
Art And Science ◽  
Rigid Contact ◽  
Contact Lens Fitting

scholarly journals Preliminary Clinical Exploration of Scleral Lens Performance on Normal Eyes

2018 ◽  
Vol 2 (2) ◽  
pp. e14-e21
Author(s):  
Melissa Barnett ◽  
Jonathon Ross ◽  
Blythe Durbin-Johnson
Keyword(s):  
Visual Acuity ◽  
Contact Lens ◽  
Healthy Subjects ◽  
Contact Lenses ◽  
Front Surface ◽  
Contact Lens Wear ◽  
Factors Associated ◽  
Rigid Contact ◽  
Lens Wear ◽  
Spectacle Correction

Abstract Objectives: The purpose of this study was to evaluate the performance (i.e. vision, comfort and fit) of spherical and front-surface toric scleral lenses in subjects with regular, healthy corneas. Methods: Scleral lenses were fitin the eyes (n = 16) of healthy subjects (n = 9) with regular corneas, absent of pathology, and studied using an observational, multi-visit design. Lens fit was objectively evaluatedby an experienced practitioner.Following 1 month of successful lens wear, participants completedsubjective satisfaction surveys regarding the scleral lens wearing experience. Results:  According to participant surveys, scleral lenses were subjectively preferred over soft toric or gas permeable contact lenses in 88% of eyes, including in all eyes fit with a front-surface toric scleral lens (n = 3). Seventy-five percent (75%) of eyes achieved visual acuity of 0.1 logMAR or better, while all eyes with prior spectacle wear achieved visual acuity with a scleral lens within 1 Snellen line of spectacle correction. Seventy-five percent (75%) of eyes achieved good subjective comfort with a scleral lens. No participants reported poor subjective vision and/or comfort. Conclusions:  Our findings suggest that subjects preferred the performance of a scleral lens (spherical or front-surface toric) compared to a soft toric or gas permeable contact lens. Moreover, scleral lenses may provide a viable, alternative contact lens modality option for patients considering discontinuation of traditional soft toric and/or rigid contact lens wear; so long as the factors associated with hypoxia remain minimized. Key Words:  scleral lens; scleral contact lens; front-surface toric scleral lens; lens performance; normal eyes; healthy eyes

The Relation between Contact Lens Oxygen Transmissibility and Binding of Pseudomonas aeruginosa to the Cornea after Overnight Wear

Ophthalmology ◽  
1994 ◽  
Vol 101 (2) ◽  
pp. 371-388 ◽  
Author(s):  
Masaki Imayasu ◽  
W. Matthew Petroll ◽  
James V. Jester ◽  
Sanjay K. Patel ◽  
Jun-ichi Ohashi ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Contact Lens

scholarly journals The influence of whole sonicated Pseudomonas aeruginosa antigens on experimental p. aeruginosa arthritis in rabbits

2014 ◽  
Vol 38 (1) ◽  
pp. 1-10
Author(s):  
Ahmed Q. Al-Awadi
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Inflammatory Reaction ◽  
Rabbit Model ◽  
Negative Control Group ◽  
Negative Control ◽  
Control Group ◽  
Post Inoculation ◽  
Bacterial Isolation ◽  
Internal Organs ◽  
Ifn Γ

To study the influence of whole sonicated Pseudomonas aeruginosa antigens (WSPAgs) on experimental arthritis induced by this bacteria, 15 rabbits were divided into 3 equal groups. The 1st group was inoculated intraarticular with 0.2 ml of p. aeruginosa suspension (2×108 cfu/ml), the 2nd group was immunized with WSP Ags, and inoculated intraarticular as in the 1st group. The 3rd group was served as negative control group. At 30 day post inoculation the immunized (2nd) group showed increase in the cellular (DTH and IFN-γ) and humeral (IgG) immunity and moderate bacterial isolation from joints, blood and internal organs comparing with other groups. The 1st group showed sever symptoms and inflammatory reaction as well as very obvious gross and microscopical lesions in their joints including supportive reaction, pyogranulomatous lesions, necrosis, pannus reaction and destruction of the articular cartilage and the lesion extended to the subchondral bone leading to osteomyelitis, the 2nd group (immunized group) expressed mild to moderate inflammatory reaction and the microscopic examination indicate that the lesion was confined in the articular capsule. In conclusion the whole Pseudononas aeruginosa sonicated Ags (WSPAgs) protect the joint from the experimental infection by P. aeruginosa in a rabbit model.

Anti-virulence Bispecific Monoclonal Antibody Mediated Protection Against Pseudomonas aeruginosa Ventilator-Associated Pneumonia in a Rabbit Model

2021 ◽  
Author(s):  
Fábio Aguiar-Alves ◽  
Hoan N. Le ◽  
Vuvi G. Tran ◽  
Emmanuelle Gras ◽  
Trang Vu ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Rabbit Model ◽  
Arterial Oxygen ◽  
Rank Test ◽  
Ventilator Associated Pneumonia ◽  
Exact Test ◽  
Cytokines And Chemokines ◽  
Potential Clinical Utility ◽  
Human Igg1 ◽  
Type 3

Ventilator-associated pneumonia is an important clinical manifestation of the nosocomial pathogen Pseudomonas aeruginosa . We characterized the correlates of protection of MEDI3902, a bispecific human IgG1 mAb that targets the P. aeruginosa type-3-secretion PcrV protein and the Psl exopolysaccharide, in a rabbit model of ventilator-associated pneumonia using lung-protective, low-tidal volume mechanical ventilation. Rabbits infused with MEDI3902 prophylactically were protected, whereas those pretreated with irrelevant isotype-control IgG (c-IgG) succumbed between 12 and 44 hours post infection [100% (8/8) vs. 0% (8/8) survival, P <0.01 by log-rank test]. Lungs from rabbits pretreated with c-IgG, but not those with MEDI3902, had bilateral, multifocal areas of marked necrosis, hemorrhage, neutrophilic inflammatory infiltrate, diffuse fibrinous edema in alveolar spaces. All rabbits pretreated with c-IgG developed worsening bacteremia that peaked at the time of death, whereas only 38% (3/8) rabbits pretreated with MEDI3902 developed such high-grade bacteremia (two-sided Fisher’s exact test, P =0.026). Biomarkers associated with acute respiratory distress syndrome were evaluated longitudinally in blood samples collected every 2-4 hours to assess systemic pathophysiological changes in rabbits pretreated with MEDI3902 or c-IgG. Biomarkers were sharply increased or decreased in rabbits pretreated with c-IgG, but not those pretreated with MEDI3902, including ratio of arterial oxygen partial pressure to fractional inspired oxygen PaO 2 /FiO 2 <300, hypercapnia or hypocapnia, severe lactic acidosis, leukopenia and neutropenia. Cytokines and chemokines associated with ARDS were significantly downregulated in lungs from rabbits pretreated with MEDI3902 compared with c-IgG. These results suggest that MEDI3902 prophylaxis could have potential clinical utility for decreasing severity of P. aeruginosa ventilator-associated pneumonia.

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