Anaerobic bacteria dominate the cholesteatoma tissue of chronic suppurative otitis media patients.

The aim of this study was to investigate both the microbial composition and absolute abundance of clinically relevant bacteria in tissue specimens from patients with chronic suppurative otitis media with cholesteatoma (CSOM with cholesteatoma). Mastoid mucosa and cholesteatoma tissue from eleven subjects with CSOM with cholesteatoma, and mastoid mucosa from ten controls were examined using standard hospital culture swabs, Gram staining, bacterial 16S rRNA gene sequencing, Droplet Digital PCR (ddPCR), and multiplex PCR. Positive results from culture swabs were reported in half the CSOM with cholesteatoma samples and 1 control sample. In contrast, ddPCR detected bacterial genes copies in all 11 mucosa and cholesteatoma of CSOM subjects and 3 control samples. The average bacterial gene copies in tissue samples with CSOM with cholesteaotoma (1.6 ± 0.7 log10) was significantly higher compared to healthy controls (0.3 ± 1.6). These results were corroborated with Gram-staining that identified the large presence of Gram-positive cocci cells in the cholesteatoma tissue of CSOM subjects which were not seen in the mucosa of controls. The most abundant genus detected by sequencing in the mucosa and cholesteatoma of CSOM samples was Anaerococcus (93.5 % of all reads), and genus Meiothermus (0.9 %) in the control sample. The 3 samples with the highest sequencing reads (>300) were further analysed using multiplex PCR to identify the dominant Anaerococcus species. Anaerococcus hydrogenalis was the dominant species identified in these samples. In contract, commonly named ear pathogens, genera Staphylococcus and Pseudomonas, were detected in low numbers (<0.001 % of all sequencing reads) and low prevalence (2/16 samples) in the tissue samples of this study. The results show that culture severely underestimated the bacterial diversity in CSOM samples and investigating tissue rather than standard culture swabs might be advantageous to understanding the disease process. The high abundance of bacteria and the large presence of Gram-positive cells detected in the cholesteatoma tissue of CSOM compared to mucosa of CSOM or controls could be members from the genus Anaerococcus. Anaerococcus may well be a pathogen in CSOM with cholesteatoma, but their role in this condition requires further investigation.

The association of bacterial biofilm and middle ear mucosa in patients with mucosal chronic suppurative otitis media.

OBJECTIVES: To evaluate the bacterial biofilm's role in mucosal chronic suppurative otitis media (CSOM) utilizing scanning electron microscopy (SEM). METHODS: This study involved 123 participating patients with active and inactive mucosal CSOM who underwent tympanomastoid surgery. SEM was used to examine middle ear mucosa biopsies for the development of biofilms. Middle ear discharge or mucosal swabs from patients were cultured to detect any bacterial growth. The biofilm formation was correlated to the culture results. RESULTS: The biofilm was present in 69.9 % of patients (59% of them were with active mucosal CSOM) and absent in 30.1% of the patients (70% of them were with inactive mucosal CSOM), being more statistically significant in active mucosal CSOM (p-value = 0.003). A correlation that was statistically significant was found between active mucosal CSOM and higher grades (3 and 4) of biofilms (p-value <0.05). The mucosal CSOM type and the results of the culture had a relationship that was statistically significant (p-value <0.001). 60% of patients had positive culture (70% of them were with active mucosal CSOM). There was a statistically significant relation between Pseudomonas aeruginosa bacterial growth and active mucosal CSOM (p-value = 0.004) as well as higher grades of biofilms in mucosal CSOM. CONCLUSION: Mucosal CSOM, especially the active type, is a biofilm-related disease. There is a significant relation between the state of mucosal CSOM (active or inactive) and culture results with predominance of Pseudomonas aeruginosa bacterial growth in active mucosal CSOM and in higher grades of biofilms in mucosal CSOM.

Chronic Suppurative Otitis Media: A Prospective Descriptive Study of the Microbiology and Antimicrobial Susceptibility Patterns.

OBJECTIVE: This study aims to identify dominant causative pathogens of chronic suppurative otitis media (CSOM) and their antimicrobial susceptibility patterns. The secondary objective is to assess the cholesteatoma concurrence among this population. STUDY DESIGN: A prospective descriptive study. SETTING: Port Elizabeth Provincial Hospital, Eastern Cape, South Africa. METHODS: Aural swabs of purulent otorrhoea were collected from patients with CSOM attending the otorhinolaryngology outpatient department between April 2022 and June 2023. Samples were analyzed to determine the microbiological spectrum and evaluate antimicrobial sensitivities. Patient files were reviewed to identify cases with cholesteatoma. The study population size of 169 enabled representative results for a confidence interval of 90%. RESULTS: Patients were divided into 2 age categories: children (0-12 years) and adults (>12 years). Adults represented the majority of cases (76.9%) and females (58.6%) were affected more than males. Fungal isolates, Candida species and Aspergillus species, were the most common (20.8%). This was followed by Pseudomonas aeruginosa (12.4%) and Staphylococcus aureus (11.8%). 3.6% of cases cultured Mycobacterial tuberculosis which was high compared to global estimates. Susceptibility patterns showed 94.3% sensitivity of fungal cultures to fluconazole. Pseudomonas aeruginosa was 100% susceptible to piperacillin-tazobactam and cefepime, but only 76.2% sensitive to ciprofloxacin. Cholesteatoma concurrence was identified in 17.8%. CONCLUSION: CSOM remains a public health challenge. This study highlights the need to consider fungal etiology in instances where standard antibiotic treatments prove ineffective. Given the variety of cultured organisms and their susceptibility patterns, incorporating culture-directed therapy should be considered standard practice for chronic otorrhoea patients.

Gram-negative Bacteria are Associated With Sensorineural Hearing Loss in Chronic Otitis Media.

OBJECT: Chronic otitis media (COM) is an inflammatory disease that commonly presents with otorrhea and hearing loss. Bacteria-induced inflammation can cause inner ear damage, leading to sensorineural hearing loss (SNHL). This study aimed to compare the prevalence and severity of SNHL in patients with gram-negative versus gram-positive cultures and examine associations between the concentrations of circulating monocytes and neutrophils with bacteria species and SNHL. METHODS: This was a retrospective study. Cholesteatoma or chronic suppurative otitis media patients with otorrhea were enrolled. Middle ear secretions were collected using sterile swabs under an otoscope, and sent for bacterial detection within 30 min. Pure tone audiometry and circulating leukocyte counts were recorded and analyzed in patients infected with different pathogens. Logistic regression analysis was used to identify the risk factors associated with SNHL. RESULTS: A total of 137 patients were enrolled, including 45 patients infected with gram-negative bacteria, 41 with gram-positive bacteria, 20 with polymicrobial infection, and 31 with no bacterial growth. Logistic regression analysis showed that bacterial culture positive infections (OR = 7.265, 95% CI 2.219-23.786, p = 0.001) were an independent risk factor for SNHL. Patients with gram-negative bacteria had higher risks of SNHL (p < 0.0001) and more severe hearing loss (p = 0.005) than those with gram-positive bacteria. COM patients infected with gram-negative bacteria showed an increase in circulating monocytes, which correlated with the occurrence of SNHL (p = 0.0343). CONCLUSION: Gram-negative bacteria are associated with elevated circulating monocyte counts and have a higher risk of severe SNHL. LEVEL OF EVIDENCE: 4 Laryngoscope, 134:3335-3341, 2024.

Janus mesoporous organosilica/platinum nanomotors for active treatment of suppurative otitis media.

We report a Janus mesoporous organosilica/platinum (MOS/Pt) nanomotor for active targeted treatment of suppurative otitis media, as a new type of multi-functional ear drop. The efficient propulsion of MOS/Pt nanomotors in hydrogen peroxide ear-cleaning drops significantly improves their binding efficiency with Staphylococcus aureus and enhances their antibacterial efficacy.

Impact of Otorrhea and Positive Cultures on Tympanoplasty Outcomes.

BACKGROUND: Chronic suppurative otitis media is a long-standing middle ear infection with a perforated tympanic membrane. Tympanoplasty is the mainstay of treatment. Most surgeons prefer to operate on dry ears; however, this may be difficult to achieve. OBJECTIVES: To investigate the effect of otorrhea and positive cultures on the outcome of tympanoplasty. METHODS: This retrospective analysis reviewed patients with chronic suppurative otitis media who underwent tympanoplasty 2008-2015. Patients were divided into three groups: active discharge and bacterial growth, active discharge without bacterial growth, and no ear discharge. Surgical outcomes were compared among the groups. RESULTS: Among 101 patients included, 43 ears (42.6%) had discharge preoperatively, 58 (57.4%) were dry. Overall closure rate was 81.2% (82/101). Preoperative active discharge closure rate was 88.3% (38/43) and without discharge 75.9% (44/58). There were 38 positive cultures preoperatively and five negative cultures. Cultures were not obtained in 58 cases. Success rates were 89.5%, 80%, and 75.9%, respectively. No significant difference was found between patients who had positive or negative cultures before the procedure (P > 0.48) or among the three groups (P = 0.25). The most common bacteria were Pseudomonas aeruginosa (n=17), followed by Staphylococcus species (n=10). None was significantly associated with operative failure (P = 0.557). The postoperative air threshold difference was not affected by culture results (P = 0.3). CONCLUSIONS: Tympanoplasty success rates and postoperative air threshold differences were not affected by the presence of preoperative otorrhea or positive ear cultures. Surgery can be performed even when the ear is not dry.

Mapping of audiometric analysis with microbiological findings in patients with chronic suppurative otitis media (CSOM): a neglected clinical manifestation.

Otitis media (OM) is an umbrella term for a number of conditions associated with middle ear inflammation. Chronic suppurative otitis media (CSOM), a type of OM, is characterized by long-term middle ear infection with perforated ear drum and otorrhea. The most common outcome associated with it is acquired hearing impairment in infected individuals which ultimately affects their cognitive and scholastic developments. Clinically, CSOM is thought to be a sequel of re-occurring episodes of Acute otitis media (AOM). Pseudomonas aeruginosa and Staphylococcus aureus are found to be the predominant pathogenic isolates in these patients. However, with the emergence of antibiotic resistance amongst these pathogens, the adequate evaluation and treatment of this condition has become more problematic. The disease has also been recognized as one of the neglected tropical clinical manifestations with high prevalence in school-age children, especially in poor or underprivileged countries. Moreover, untreated cases have further worsened the situation by contributing to various life-threatening complications. Thus, effective treatment and surgical strategies, as well as strengthening of hearing care algorithms along with the discovery of novel animal models for advanced clinical research, can jointly help to fight this disease. In this regard, mapping of the audiological analysis with microbiological findings in CSOM patients may help elucidate the frequency that favors growth of specific pathogens. Knowledge about this potential correlation can then support timely detection of the infection, which is perceived as one of the emerging approaches for its management. In addition to these strategies, creating a true sense of awareness among people can also help mitigate this pathological condition by facilitating early identification, prevention, and treatment. This review discusses the incidence, pathogenesis, investigations, complications, and available treatment modalities associated with CSOM.

Definite therapy of mixed infection alleviates refractory dilemma of adult chronic suppurative otitis media.

The characteristics, risk factors, microbial distributions and effective treatment regimens for Chronic suppurative otitis media (CSOM) patients intractable to empirical therapy were analyzed. Adult CSOM patients of China Medical University Hospital from 2018 to 2020 were included. Subjects of refractory and non-refractory groups were investigated for characteristics of age, sex, nation, comorbidities, otomycosis, and associated complications. Risk factors, microbiology distributions, and treatment regimens were analyzed. Twenty-six refractory patients (55.0 ± 17.7 years) and 66 non-refractory patients (54.1 ± 13.7 years) were studied. A significantly higher rate of otomycosis and CSOM complications was observed in refractory group than in non-refractory one (73.1% vs. 36.4%; p = 0.002; 57.7% vs. 10.6%, p < 0.001, respectively). Multivariate analysis revealed atopic diathesis (p = 0.048), otomycosis (p = 0.003) and CSOM complications (p < 0.001) were risk factors of refractory CSOM. Coagulase-negative staphylococci (CoNS) and methicillin-resistant Staphylococcus aureus (MRSA) were the prevailing pathogens. Patients of refractory group tented to have higher rates of mixed infection (42.9%% vs. 23.7%) and significantly more included fungal pathogen (19.0% vs. 2.6%; p = 0.049) than those of non-refractory cohort. Topical treatment of fungus significantly improved outcome of refractory CSOM. Atopic diathesis, otomycosis, and CSOM-associated complications were risk factors of refractory CSOM. Systemic and local treatment to possible drug-resistant pathogens, likely CoNS and fungus, possible improves recalcitrant CSOM. Correspondingly, early identification of CSOM complications, routine culture and susceptibility testing and treatment of resistant bacteria and fungus are key elements to the successful management of adult CSOM.

Chronic suppurative otitis media causes macrophage-associated sensorineural hearing loss.

BACKGROUND: Chronic suppurative otitis media (CSOM) is the most common cause of permanent hearing loss in children in the developing world. A large component of the permanent hearing loss is sensory in nature and our understanding of the mechanism of this has so far been limited to post-mortem human specimens or acute infection models that are not representative of human CSOM. In this report, we assess cochlear injury in a validated Pseudomonas aeruginosa (PA) CSOM mouse model. METHODS: We generated persisters (PCs) and inoculated them into the mouse middle ear cavity. We tracked infection with IVIS and detected PA using RT-PCR. We assessed cochlear damage and innate immunity by Immunohistochemistry. Finally, we evaluated cytokines with multiplex assay and quantitative real-time PCR. RESULTS: We observed outer hair cell (OHC) loss predominantly in the basal turn of the cochlear at 14 days after bacterial inoculation. Macrophages, not neutrophils are the major immune cells in the cochlea in CSOM displaying increased numbers and a distribution correlated with the observed cochlear injury. The progression of the morphological changes suggests a transition from monocytes into tissue macrophages following infection. We also show that PA do not enter the cochlea and live bacteria are required for cochlear injury. We characterized cytokine activity in the CSOM cochlea. CONCLUSIONS: Taken together, this data shows a critical role for macrophages in CSOM-mediated sensorineural hearing loss (SNHL).

Pilot study of dogs with suppurative and non-suppurative Malassezia otitis: A case series.

BACKGROUND: Rarely, Malassezia otitis presents as a painful, erosive otitis with an otic discharge containing Malassezia and neutrophils on cytology. There are no published reports of this type of suppurative Malassezia otitis (SMO). The role of Malassezia hypersensitivity in otitis is still unknown, and no association has been demonstrated with SMO. We compared Malassezia IgE levels, intradermal test and histology changes in SMO dogs with the more conventional Malassezia otitis (MO) presentation. RESULTS: Three dogs (case 1, case 2 and case 3) were diagnosed with SMO, one dog (case 4) was diagnosed with unilateral MO and unilateral SMO, and one dog (case 5) was diagnosed with MO. Only one case (case 4) with SMO/MO had a positive Intradermal Allergy Test (IDAT) and elevated IgE levels for Malassezia. Histopathology findings from SMO revealed: interface dermatitis (case 1 and 3), lymphocytic dermatitis (case 2) and chronic hyperplastic eosinophilic and lymphoplasmacytic dermatitis (case 4). Histopathology findings from MO showed perivascular dermatitis (case 4 and 5). All the cases were treated successfully. CONCLUSIONS: SMO presents with a distinct clinical phenotype in comparison with conventional MO. No consistent aetiology could be isolated. In these clinical cases it is possible that previous treatments could have influenced the results. More research is needed to understand the possible aetiologies and the pathogenesis of SMO.

Treatment with a neutrophil elastase inhibitor and ofloxacin reduces P. aeruginosa burden in a mouse model of chronic suppurative otitis media.

Chronic suppurative otitis media (CSOM) is a widespread, debilitating problem with poorly understood immunology. Here, we assess the host response to middle ear infection over the course of a month post-infection in a mouse model of CSOM and in human subjects with the disease. Using multiparameter flow cytometry and a binomial generalized linear machine learning model, we identified Ly6G, a surface marker of mature neutrophils, as the most informative factor of host response driving disease in the CSOM mouse model. Consistent with this, neutrophils were the most abundant cell type in infected mice and Ly6G expression tracked with the course of infection. Moreover, neutrophil-specific immunomodulatory treatment using the neutrophil elastase inhibitor GW 311616A significantly reduces bacterial burden relative to ofloxacin-only treated animals in this model. The levels of dsDNA in middle ear effusion samples are elevated in both humans and mice with CSOM and decreased during treatment, suggesting that dsDNA may serve as a molecular biomarker of treatment response. Together these data strongly implicate neutrophils in the ineffective immune response to P. aeruginosa infection in CSOM and suggest that immunomodulatory strategies may benefit drug-tolerant infections for chronic biofilm-mediated disease.

Evaluation and comparison of tympanoplasty efficacy with tympanic membrane perforation after chronic suppurative otitis media in dry ear with different microorganisms.

OBJECTIVE: To investigate the distribution of pathogenic bacteria in patients with tympanic membrane perforation after chronic suppurative otitis media (CSOM) in dry ear and its influence on the success rate of tympanoplasty and postoperative infection. METHODS: 740 patients with tympanic membrane perforation after CSOM underwent endoscopic tympanoplasty were selected. The mucosal surface secretion of middle-ear was collected for bacterial culture and drug sensitivity test. The patients were followed up several times from 1 week to 3 months after the surgery. RESULTS: 740 cases of ear secretions samples, raise the pathogens of 208 cases (28.1%), the success rate of surgery with microorganism grown and with no grown was 93.8% and 91.5%. fungus (14.6%) was the most species among the patients with the positive result, followed by methicillin-sensitive Staphylococcus aureus (4.1%), Pseudomonas (2.0%), Staphylococcus epidermidis (1.9%), methicillin-resistant Staphylococcus aureus (1.6%) and so on. There was no statistical difference in the proportion of perforation and infection in each group. There were no statistically significant differences in gender, age and duration of disease among the groups. CONCLUSION: There were still microbial colonization in patients with tympanic membrane perforation after CSOM in dry ear, include fungus, Staphylococcus aureus and Pseudomonas aeruginosa. Different microbial colonization had no influence on the success rate of tympanoplasty and postoperative infection.

Bacteriological Profile of Chronic Suppurative Otitis Media and Antibiotic Susceptibility in a Tertiary Care Hospital in Shanghai, China.

OBJECTIVE: Chronic suppurative otitis media (CSOM) is mostly caused by bacterial infection of the middle ear and antibiotics are generally used empirically, which may lead to the emergence of resistant bacterial strains. The objective of the study is to assess the bacteriological profile of and evaluate the antibiotic susceptibility of strains isolated in a tertiary care hospital in Shanghai, China. METHODS: This study included 289 individuals with clinical diagnosis of CSOM. Middle ear purulent discharge was obtained with sterile swabs and cultured for bacterial pathogens. The susceptibility of the isolated microorganisms to antibiotics was assessed by a microdilution method. RESULTS: Bacterial pathogens were found in 223 (77.2%) of the 289 cases. A total of 236 strains were isolated. Staphylococcus aureus was the commonest bacteria (44.9%) followed by Pseudomonas aeruginosa (16.9%) and coagulase-negative Staphylococcus (8.5%). There were 18.9% methicillin-resistant S aureus (MRSA) among the obtained S aureus organisms. Multidrug-resistant P aeruginosa was found in 4 patients, making up 10% of all detected P aeruginosa. Staphylococcus aureus showed highest susceptibility to vancomycin (100%), then gentamicin (98.1%) and rifampicin (97.2%) and was most resistant to penicillin (61.3%) and erythromycin (50%). All isolated P aeruginosa showed susceptibility to piperacillin, piperacillin/tazobactam, and meropenem. High degree of resistance in P aeruginosa was observed toward levofloxacin (42.5%), ciprofloxacin (40%), and ceftriaxone (30%). CONCLUSION: The high prevalence of MRSA and fluoroquinolone-resistant P aeruginosa indicated cephalosporins and fluoroquinolone as primary empirical antibiotic drugs in CSOM to be cautiously used. In order to reduce the incidence of resistant strains and promote effective usage of antibiotics, all aural discharges should be cultured to determine antibacterial susceptibility patterns before treatment.

A novel mouse model of chronic suppurative otitis media and its use in preclinical antibiotic evaluation.

Chronic suppurative otitis media (CSOM) is a neglected pediatric disease affecting 330 million worldwide for which no new drugs have been introduced for over a decade. We developed a mouse model with utility in preclinical drug evaluation and antimicrobial discovery. Our model used immune-competent mice, tympanic membrane perforation and inoculation with luminescent Pseudomonas aeruginosa that enabled bacterial abundance tracking in real-time for 100 days. The resulting chronic infection exhibited hallmark features of clinical CSOM, including inhibition of tympanic membrane healing and purulent ear discharge. We evaluated the standard care fluoroquinolone ofloxacin and demonstrated that this therapy resulted in a temporary reduction of bacterial burden. These data are consistent with the clinical problem of persistent infection in CSOM and the need for therapeutic outcome measures that assess eradication post-therapeutic endpoint. We conclude that this novel mouse model of CSOM has value in investigating new potential therapies.

Tuberculous otitis media with osteomyelitis of the regional craniofacial bones.

Tuberculosis is an uncommon cause of chronic suppurative otitis media. Delay in diagnosis can lead to delayed treatment, resulting in significant complications. We describe a case of tuberculous otitis media with osteomyelitis of the craniofacial bones in a 44-year-old woman with chronic painless suppurative otorrhea, not responding to antibiotics, hearing loss, and facial palsy. Chest X-ray was normal. Computed tomography of the temporal bone showed the destruction of the left zygomatic bone, clivus, and petrous part of the temporal bone. Polymerase chain reaction was positive for Mycobacterium tuberculosis (MTB), and histopathological findings showed caseous necrotizing tissues. Sputum culture was negative for MTB. The patient was successfully treated with surgery and anti-tuberculosis drugs. The polymerase chain reaction is a sensitive, rapid diagnostic tool used to diagnose TB. Surgical approaches and operative biopsy should be considered when the cause of the chronic purulent discharge is still unknown.

Chronic suppurative otitis media due to Streptomyces cacaoi, the second case report in human infection.

BACKGROUND: Streptomyces cacaoi, Gram-positive, branched, filamentous bacillus forms without fragmentation, are saprophytic soil organisms rarely known to cause invasive infections other than mycetoma. Here we describe a case of chronic suppurative otitis media caused by Streptomyces cacaoi in a patient with hyperlipidemia in China. CASE PRESENTATION: A 62-year-old female patient with hyperlipidemia suffered chronic suppurative otitis media caused by Streptomyces cacaoi. She had a favorable outcome with a 4-week course of ofloxacin ear drops. CONCLUSIONS: Streptomyces cacaoi is rarely reported to cause human infection. The introduction of molecular techniques improves the ability to identify rare species such as Streptomyces considerably. We report the case improve our ability to identify this pathogen and expand the range of known bacterial causes of human infection.

Analysis of main pathogenic bacteria and drug sensitivity in patients with chronic suppurative otitis media and middle ear cholesteatoma in China.

BACKGROUND: Chronic suppurative otitis media (CSOM) and middle ear cholesteatoma (MEC) were classified as different diseases recently. Owing to the difference in pathogeneses, the pathogenic bacteria of the two diseases can be different. However, few studies have compared the two types of pathogenic bacteria. OBJECTIVE: To analyze the main pathogenic bacteria and drug sensitivities in patients of Southwest China with CSOM and MEC and compare the difference of ear dryness rate between empirical and sensitive medication. METHODS: According to the data of culture of ear discharge and postoperative pathological examination, the patients were divided into CSOM and MEC groups. A cohort study was carried out in 1087 hospitalized patients with CSOM and MEC in the Department of Otolaryngology head and neck surgery, West China Hospital from January 2015 to June 2019. RESULTS: Pathogenic bacteria were detected in 467 of 726 cases of CSOM (64.46%) and in 190 of 361 cases of MEC (52.63%). Of the positive cases, 53.96% involved gram-positive (G+) bacteria and 46.04% involved gram-negative (G-) bacteria in the CSOM group; 41.05% involved G+ bacteria and 58.95% involved G- bacteria in the MEC group (P < 0.05). In the CSOM group, the top four pathogens were Staphylococcus aureus (33.62%), Pseudomonas aeruginosa (23.98%), Proteus (16.92%), and Coagulase-negative Staphylococci (10.28%). The top four pathogens in the MEC group were Proteus (22.11%), S. aureus (21.05%), P. aeruginosa (15.26%), and coagulase-negative staphylococci (8.42%). S. aureus was more sensitive to ciprofloxacin and moxifloxacin in the MEC group than in the CSOM group (= 14.286, P < 0.001; = 8.244, P < 0.01). P. aeruginosa was more sensitive to neomycin and tobramycin in the MEC group than in the CSOM group (= 21.285, P < 0.001; = 4.060, P < 0.05). The sensitivity rate of coagulase-negative staphylococci to neomycin in the MEC group was higher than that in the CSOM group (= 5.126, P < 0.05). The sensitivity of Proteus to piperacillin tazobactam in the CSOM group was higher than that in the MEC group (= 8.881, P < 0.05). The dry ear rate of patients with sensitive drug was significantly higher than the patients with empirical drug (= 19.431, P < 0.001). CONCLUSION: The detection rate of G+ bacteria in the CSOM group was higher than that in the MEC group. The detection rate of G- bacteria in the CSOM group was lower than that in the MEC group. The main pathogens in the two groups included S. aureus, P. aeruginosa, Proteus and coagulase negative Staphylococcus. The dry ear rate of patients who used sensitive drugs was significantly higher than the patients who used empirical drugs. Reducing the rate of empirical use of antibiotics as much as possible and selecting antibiotics reasonably were beneficial to the improvement of dry ear rate after surgery.

Prevalence and etiological agents for chronic suppurative otitis media in a tertiary hospital in Tanzania.

OBJECTIVE: Chronic suppurative otitis media is among the most common otological condition reported in otorhinolaryngology practice commonly attributing to preventable hearing loss. The aim of this study was to determine the prevalence and etiological agents for chronic suppurative otitis media in our department. RESULTS: A total of 5591 patients were recruited in this study and only 79 (1.4%) had chronic suppurative otitis media. A male preponderance 43 (54.4%) was noted in this study and the left ear (58.2%) was more commonly affected compared to the right ear. Central perforation was the commonest pattern of presentation and was reported in 53% of cases though none had attic perforation. Of the 81 processed ear swabs, microbial growth was seen in majority 80 (98.8%) whilst one sample showed no microbial growth whereas 52.5% had polymicrobial growth. Among the isolates, most were gram negative species accounting for 59.7% while gram positive bacteria accounted for 25.6% and fungi accounted for 14.7%. Most of these isolates were facultative anaerobes. Klebsiella pneumoniae (20.2%) was the commonest isolates while Escherichia coli and Pseudomonas aeruginosa were equally least isolated (10.9%). Tested isolates were most sensitive to Ciprofloxacin, Gentamycin, Ceftriaxone and Amikacin and least sensitive to Amoxicillin/clavulanic acid and Ampicillin.

Bacterial profile and antimicrobial susceptibility patterns in chronic suppurative otitis media at the University of Gondar Comprehensive Specialized Hospital, Northwest Ethiopia.

OBJECTIVES: This study aims to determine bacterial profile and antimicrobial susceptibility patterns of chronic suppurative otitis media in the University of Gondar Comprehensive Specialized Hospital, Northwest Ethiopia. RESULT: Sixty-two ear swabs were collected and 74 bacterial isolates were identified, of which 48 (77.4%) sample with mono-microbial growth, 11 (17.8%) with polymicrobial growth and the remaining 3 (4.8%) show no growth. The most common isolates were Proteus mirabilis 16 (21.6%), followed by S. aureus 12 (16.2%), Klebsiella spp. 10 (13.5%) and Providencia spp. 11 (14.9%). Proteus mirabilis was 100% susceptible to norfloxacin and ciprofloxacin while 87.5% of the isolates were susceptible to cefixime and gentamicin. S. aureus was 83.3% susceptible to gentamicin and clarithromycin, while 75% of the isolates were susceptible to amoxicillin-clavulanic acid and chloramphenicol, however, 66.7% the isolates were susceptible to ciprofloxacin, norfloxacin and erythromycin. The overall prevalence of multidrug resistance in the current study was 35 (47.3%). In this study P. mirabilis, S. aureus, Providencia spp., and Klebsiella spp. were the most common bacterial isolate and all Gram negative isolates were susceptible to ciprofloxacin and norfloxacin. Amoxicillin-clavulanic acid, gentamicin, chloramphenicol, clarithromycin and tobramycin were relatively effective against Gram positive bacteria.