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van der Toom HFE, van der Schroeff MP, Molenaar TL, Metselaar M, van Linge A, Vroegop JL, Pauw RJ. Revision surgery for chronically discharging mastoid cavities: mastoid obliteration with canal wall reconstruction versus non-obliteration surgery. Eur Arch Otorhinolaryngol 2021; 279:3881-3889. [PMID: 34705081 PMCID: PMC9249682 DOI: 10.1007/s00405-021-07138-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 10/12/2021] [Indexed: 11/26/2022]
Abstract
Purpose To evaluate the surgical results of revision canal wall down (CWD) surgery for chronically discharging mastoid cavities and to compare the non-obliteration approach to mastoid obliteration with canal wall reconstruction. Methods This is a retrospective cohort study. All adult patients (≥ 18 years) who underwent revision surgery for chronically draining mastoid cavities between January 2013 and January 2020 were included. Primary outcome measures included the dry ear rate, complications and postoperative hearing. Results 79 ears were included; 56 ears received revision CWD with mastoid obliteration and posterior canal wall reconstruction and 23 ears received CWD without mastoid obliteration. The dry ear rate at the most recent outpatient clinic visit (median 28.0 months postoperative) was significantly higher in the obliteration group with 96.4% compared to 73.9% for the non-obliteration group (p = .002). There were no differences in audiological outcome and incidence of complications between the two techniques. Conclusion We show that in our study population revision CWD surgery with mastoid obliteration and posterior canal wall reconstruction is superior to revision CWD surgery without mastoid obliteration in the management of chronically discharging mastoid cavities. In the obliteration group, a dry ear was achieved in 96.4% as this was 73.9% in the non-obliteration group. We found no differences in audiological outcome and in incidence of complications between the two techniques. Supplementary Information The online version contains supplementary material available at 10.1007/s00405-021-07138-0.
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Affiliation(s)
- Hylke F E van der Toom
- Department of Otorhinolaryngology and Head and Neck Surgery, Erasmus Medical Center, Doctor Molewaterplein 40, 3015 GD, Rotterdam, The Netherlands.
| | - Marc P van der Schroeff
- Department of Otorhinolaryngology and Head and Neck Surgery, Erasmus Medical Center, Doctor Molewaterplein 40, 3015 GD, Rotterdam, The Netherlands
| | - Tim L Molenaar
- Department of Otorhinolaryngology and Head and Neck Surgery, Erasmus Medical Center, Doctor Molewaterplein 40, 3015 GD, Rotterdam, The Netherlands
| | - Mick Metselaar
- Department of Otorhinolaryngology and Head and Neck Surgery, Erasmus Medical Center, Doctor Molewaterplein 40, 3015 GD, Rotterdam, The Netherlands
| | - Anne van Linge
- Department of Otorhinolaryngology and Head and Neck Surgery, Erasmus Medical Center, Doctor Molewaterplein 40, 3015 GD, Rotterdam, The Netherlands
| | - Jantien L Vroegop
- Department of Otorhinolaryngology and Head and Neck Surgery, Erasmus Medical Center, Doctor Molewaterplein 40, 3015 GD, Rotterdam, The Netherlands
| | - Robert J Pauw
- Department of Otorhinolaryngology and Head and Neck Surgery, Erasmus Medical Center, Doctor Molewaterplein 40, 3015 GD, Rotterdam, The Netherlands
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van der Toom HFE, van der Schroeff MP, Metselaar M, van Linge A, Vroegop JL, Pauw RJ. Treatment Outcome of the Bony Obliteration Tympanoplasty Versus Nonobliterative Techniques in Cholesteatoma Surgery: A Retrospective Analysis. Otol Neurotol 2021; 42:1366-1374. [PMID: 34238901 DOI: 10.1097/mao.0000000000003246] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
OBJECTIVE In cholesteatoma surgery, obliteration of the mastoid and epitympanic space (bony obliteration tympanoplasty, BOT) is an increasingly used technique with low recurrent and residual cholesteatoma rates. While factors as the postoperative hearing level and infection rate are important for the patient as well, these outcome parameters are not frequently reported on in current literature. The objective of this study is to evaluate the recurrent and residual cholesteatoma rates of the BOT technique and nonobliterative canal wall up (CWU) and canal wall down (CWD) mastoidectomy in a large patient cohort. Secondary objectives were to evaluate the infection rate and hearing outcome for all three techniques. DESIGN Retrospective cohort study. SETTING Single-center study. PATIENTS All 337 adult patients (≥18 yrs) who underwent primary or revision cholesteatoma surgery between January 2013 and March 2019 were included. MAIN OUTCOME AND MEASURES Recurrent cholesteatoma rates, residual cholesteatoma rates, postoperative infections and other complications, hearing outcome. RESULTS The estimated combined rate of recurrent and residual cholesteatoma at 5 years follow-up was 7.6% in the BOT group, 34.9% in the CWU group, and 17.9% in the CWD group. The postoperative infection rate in the different groups ranged from 4.3% to 4.9%. The median gain in AC threshold level varied from 0.0 dB in the BOT and CWD group to 3.8 dB in the CWU group. CONCLUSIONS We show that cholesteatoma recurrence rates after the BOT technique in our clinic are significantly lower compared to CWU surgery. There were no differences in infection rate and no clinically relevant differences in postoperative hearing between the BOT, CWU, and CWD technique.
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Affiliation(s)
- Hylke F E van der Toom
- Department of Otorhinolaryngology and Head and Neck Surgery, Erasmus Medical Center, Rotterdam, The Netherlands
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Hoare R, Leigh W, Limakom T, Wongwaradechkul R, Metselaar M, Shinn AP, Ngo TPH, Thompson KD, Adams A. Oral vaccination of Nile tilapia (Oreochromis niloticus) against francisellosis elevates specific antibody titres in serum and mucus. Fish Shellfish Immunol 2021; 113:86-88. [PMID: 33826937 DOI: 10.1016/j.fsi.2021.03.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 03/22/2021] [Accepted: 03/29/2021] [Indexed: 06/12/2023]
Abstract
Although Nile tilapia (Oreochromis niloticus) is a well-established aquaculture species globally, there are a limited number of commercial vaccines available or are used for this species. The majority of diseases affecting farmed tilapia are bacterial, with antibiotics frequently used to treat fish. The current study was performed to optimise the use of mucosal vaccines for tilapia by adapting an existing bacterin vaccine against Francisella noatunensis subsp. orientalis (Fno) as a proof of concept. This vaccine has previously provided excellent protection by injection, however, the preference for tilapia farmers would be to vaccinate fish by immersion or orally, due to the lower cost and ease of application. These vaccination routes, however, are often less efficacious probably due to the lack of adjuvants in immersion and oral vaccines. The aims of this study, therefore, were to optimise the formulation and dose of the Fno vaccine with mucosal adjuvants for oral and immersion delivery. Tilapia fry (av. 6 g) were given three concentrations (high, medium, low; i.e. 1×109, 1×108 and 1×107 CFU mL-1) of antigen combined with the oral adjuvant by oral gavage, to optimise the dose needed to induce an immune response to Fno, and the immune response obtained compared with fish vaccinated by immersion (with and without an immersion adjuvant). Fry were boosted by the same route at 420 degree days (DD), and samples (serum, mucus ) taken at 840 DD for specific antibody responses measured by ELISA and western blotting. Specific IgM titres were significantly elevated in serum and mucus of fish given the high dose adjuvanted vaccine by gavage. In addition, by western blotting with serum, a significant immunogenic reaction was evident between 20 and 37 kDa in the fish given the high dose oral vaccine by gavage. As protection against Fno provided by the injection vaccine was correlated with specific antibody responses these findings suggest the oral vaccine also has potential to provide protection. Further studies are needed to optimise delivery of the vaccine via feed.
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Affiliation(s)
- R Hoare
- Institute of Aquaculture, University of Stirling, Stirling, UK.
| | - W Leigh
- Institute of Aquaculture, University of Stirling, Stirling, UK
| | - T Limakom
- Benchmark R&D (Thailand) Ltd., Saensook, Chonburi, 20000, Thailand
| | | | - M Metselaar
- Benchmark Animal Health, Bush House, Edinburgh Technopole, Edinburgh, UK
| | - A P Shinn
- Benchmark R&D (Thailand) Ltd., Saensook, Chonburi, 20000, Thailand
| | - T P H Ngo
- Aquacultural Biotechnology Division, Biotechnology Centre of Ho Chi Minh City, Viet Nam
| | - K D Thompson
- Moredun Research Institute, Pentland Science Park, Penicuik, UK
| | - A Adams
- Institute of Aquaculture, University of Stirling, Stirling, UK
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4
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Shahin K, Thompson KD, Inglis NF, Mclean K, Ramirez-Paredes JG, Monaghan SJ, Hoare R, Fontaine M, Metselaar M, Adams A. Characterization of the outer membrane proteome of Francisella noatunensis subsp. orientalis. J Appl Microbiol 2018; 125:686-699. [PMID: 29777634 DOI: 10.1111/jam.13918] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Revised: 05/03/2018] [Accepted: 05/11/2018] [Indexed: 11/28/2022]
Abstract
AIMS The aims of the current study were to characterize the outer membrane proteins (OMPs) of Francisella noatunensis subsp. orientalis (Fno) STIR-GUS-F2f7, and identify proteins recognized by sera from tilapia, Oreochromis niloticus, (L) that survived experimental challenge with Fno. METHODS AND RESULTS The composition of the OMPs of a virulent strain of Fno (STIR-GUS-F2f7), isolated from diseased red Nile tilapia in the United Kingdom, was examined. The sarcosine-insoluble OMPs fraction was screened with tilapia hyperimmune sera by western blot analysis following separation of the proteins by 1D SDS-PAGE. Liquid chromatography-electrospray ionization-tandem mass spectrometry (LC-ESI-MS/MS) was used to identify the various proteins present in the OMP profile. Two hundred and thirty-nine proteins were identified, of which 44 were found in the immunogenic band recognized by the tilapia hyperimmune serum. In silico analysis was performed to predict the function and location of the OMPs identified by MS. CONCLUSIONS Using a powerful proteomic-based approach in conjugation with western immunoblotting, proteins comprising the outer membrane fraction of Fno STIR-GUS-F2f7 were identified, catalogued and screened for immune recognition by tilapia sera. SIGNIFICANCE AND IMPACT OF THE STUDY The current study is the first report on the characterization of Fno-OMPs. The findings here provide preliminary data on bacterial surface proteins that exist in direct contact with the host's immune defences during infection and offer an insight into the pathogenesis of Fno.
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Affiliation(s)
- K Shahin
- Faculty of Natural Sciences, Institute of Aquaculture, University of Stirling, Stirling, Scotland, UK.,Aquatic Animals Diseases Lab, Aquaculture Division, National Institute of Oceanography and Fisheries, Suez, Egypt
| | - K D Thompson
- Moredun Research Institute, Pentlands Science Park, Penicuik, Midlothian, UK
| | - N F Inglis
- Moredun Research Institute, Pentlands Science Park, Penicuik, Midlothian, UK
| | - K Mclean
- Moredun Research Institute, Pentlands Science Park, Penicuik, Midlothian, UK
| | - J G Ramirez-Paredes
- Faculty of Natural Sciences, Institute of Aquaculture, University of Stirling, Stirling, Scotland, UK
| | - S J Monaghan
- Faculty of Natural Sciences, Institute of Aquaculture, University of Stirling, Stirling, Scotland, UK
| | - R Hoare
- Faculty of Natural Sciences, Institute of Aquaculture, University of Stirling, Stirling, Scotland, UK
| | - M Fontaine
- Benchmark Animal Health, Bush House, Edinburgh Technopole, Edinburgh, Midlothian, UK
| | - M Metselaar
- Benchmark Animal Health, Bush House, Edinburgh Technopole, Edinburgh, Midlothian, UK
| | - A Adams
- Faculty of Natural Sciences, Institute of Aquaculture, University of Stirling, Stirling, Scotland, UK
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5
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Rigters SC, Bos D, Metselaar M, Roshchupkin GV, Baatenburg de Jong RJ, Ikram MA, Vernooij MW, Goedegebure A. Corrigendum: Hearing Impairment Is Associated with Smaller Brain Volume in Aging. Front Aging Neurosci 2017; 9:131. [PMID: 28491034 PMCID: PMC5420703 DOI: 10.3389/fnagi.2017.00131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Accepted: 04/19/2017] [Indexed: 11/17/2022] Open
Affiliation(s)
- Stephanie C Rigters
- Department of Otorhinolaryngology, Head and Neck Surgery, Erasmus University Medical CenterRotterdam, Netherlands
| | - Daniel Bos
- Department of Radiology, Erasmus University Medical CenterRotterdam, Netherlands.,Department of Epidemiology, Erasmus University Medical CenterRotterdam, Netherlands
| | - Mick Metselaar
- Department of Otorhinolaryngology, Head and Neck Surgery, Erasmus University Medical CenterRotterdam, Netherlands
| | | | - Robert J Baatenburg de Jong
- Department of Otorhinolaryngology, Head and Neck Surgery, Erasmus University Medical CenterRotterdam, Netherlands
| | - M Arfan Ikram
- Department of Radiology, Erasmus University Medical CenterRotterdam, Netherlands.,Department of Epidemiology, Erasmus University Medical CenterRotterdam, Netherlands.,Department of Neurology, Erasmus University Medical CenterRotterdam, Netherlands
| | - Meike W Vernooij
- Department of Radiology, Erasmus University Medical CenterRotterdam, Netherlands.,Department of Epidemiology, Erasmus University Medical CenterRotterdam, Netherlands
| | - André Goedegebure
- Department of Otorhinolaryngology, Head and Neck Surgery, Erasmus University Medical CenterRotterdam, Netherlands
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6
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Rigters SC, Bos D, Metselaar M, Roshchupkin GV, Baatenburg de Jong RJ, Ikram MA, Vernooij MW, Goedegebure A. Hearing Impairment Is Associated with Smaller Brain Volume in Aging. Front Aging Neurosci 2017; 9:2. [PMID: 28163683 PMCID: PMC5247429 DOI: 10.3389/fnagi.2017.00002] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2016] [Accepted: 01/04/2017] [Indexed: 01/09/2023] Open
Abstract
Although recent studies show that age-related hearing impairment is associated with cerebral changes, data from a population perspective are still lacking. Therefore, we studied the relation between hearing impairment and brain volume in a large elderly cohort. From the population-based Rotterdam Study, 2,908 participants (mean age 65 years, 56% female) underwent a pure-tone audiogram to quantify hearing impairment. By performing MR imaging of the brain we quantified global and regional brain tissue volumes (total brain volume, gray matter volume, white matter (WM) volume, and lobe-specific volumes). We used multiple linear regression models, adjusting for age, sex, head size, time between hearing test and MR imaging, and relevant cognitive and cardiovascular covariates. Furthermore, we performed voxel-based morphometry to explore sub-regional differences. We found that a higher pure-tone threshold was associated with a smaller total brain volume [difference in standardized brain volume per decibel increase in hearing threshold in the age-sex adjusted model: -0.003 (95% confidence interval -0.004; -0.001)]. Specifically, WM volume was associated. Both associations were more pronounced in the lower frequencies. All associations were consistently present in all brain lobes in the lower frequencies and in most lobes in the higher frequencies, and were independent of cognitive function and cardiovascular risk factors. In voxel-based analyses we found associations of hearing impairment with smaller white volumes and some smaller and larger gray volumes, yet these were statistically non-significant. Our findings demonstrate that hearing impairment in elderly is related to smaller total brain volume, independent of cognition and cardiovascular risk factors. This mainly seems to be driven by smaller WM volume, throughout the brain.
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Affiliation(s)
- Stephanie C Rigters
- Department of Otorhinolaryngology, Head and Neck Surgery, Erasmus University Medical Center Rotterdam, Netherlands
| | - Daniel Bos
- Department of Radiology, Erasmus University Medical CenterRotterdam, Netherlands; Department of Epidemiology, Erasmus University Medical CenterRotterdam, Netherlands
| | - Mick Metselaar
- Department of Otorhinolaryngology, Head and Neck Surgery, Erasmus University Medical Center Rotterdam, Netherlands
| | | | - Robert J Baatenburg de Jong
- Department of Otorhinolaryngology, Head and Neck Surgery, Erasmus University Medical Center Rotterdam, Netherlands
| | - M Arfan Ikram
- Department of Radiology, Erasmus University Medical CenterRotterdam, Netherlands; Department of Epidemiology, Erasmus University Medical CenterRotterdam, Netherlands; Department of Neurology, Erasmus University Medical CenterRotterdam, Netherlands
| | - Meike W Vernooij
- Department of Radiology, Erasmus University Medical CenterRotterdam, Netherlands; Department of Epidemiology, Erasmus University Medical CenterRotterdam, Netherlands
| | - André Goedegebure
- Department of Otorhinolaryngology, Head and Neck Surgery, Erasmus University Medical Center Rotterdam, Netherlands
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7
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Rigters SC, Metselaar M, Wieringa MH, Baatenburg de Jong RJ, Hofman A, Goedegebure A. Contributing Determinants to Hearing Loss in Elderly Men and Women: Results from the Population-Based Rotterdam Study. Audiol Neurootol 2016; 21 Suppl 1:10-15. [DOI: 10.1159/000448348] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
To contribute to a better understanding of the etiology in age-related hearing loss, we carried out a cross-sectional study of 3,315 participants (aged 52-99 years) in the Rotterdam Study, to analyze both low- and high-frequency hearing loss in men and women. Hearing thresholds with pure-tone audiometry were obtained, and other detailed information on a large number of possible determinants was collected. Hearing loss was associated with age, education, systolic blood pressure, diabetes mellitus, body mass index, smoking and alcohol consumption (inverse correlation). Remarkably, different associations were found for low- and high-frequency loss, as well as between men and women, suggesting that different mechanisms are involved in the etiology of age-related hearing loss.
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8
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Oidtmann B, Lapatra SE, Verner-Jeffreys D, Pond M, Peeler EJ, Noguera PA, Bruno DW, St-Hilaire S, Schubiger CB, Snekvik K, Crumlish M, Green DM, Metselaar M, Rodger H, Schmidt-Posthaus H, Galeotti M, Feist SW. Differential characterization of emerging skin diseases of rainbow trout--a standardized approach to capturing disease characteristics and development of case definitions. J Fish Dis 2013; 36:921-937. [PMID: 23448696 DOI: 10.1111/jfd.12086] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Accepted: 01/02/2013] [Indexed: 06/01/2023]
Abstract
Farmed and wild salmonids are affected by a variety of skin conditions, some of which have significant economic and welfare implications. In many cases, the causes are not well understood, and one example is cold water strawberry disease of rainbow trout, also called red mark syndrome, which has been recorded in the UK since 2003. To date, there are no internationally agreed methods for describing these conditions, which has caused confusion for farmers and health professionals, who are often unclear as to whether they are dealing with a new or a previously described condition. This has resulted, inevitably, in delays to both accurate diagnosis and effective treatment regimes. Here, we provide a standardized methodology for the description of skin conditions of rainbow trout of uncertain aetiology. We demonstrate how the approach can be used to develop case definitions, using coldwater strawberry disease as an example.
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Affiliation(s)
- B Oidtmann
- Centre for Environment, Fisheries and Aquaculture Science, Weymouth, Dorset, UK
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9
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VanderWerf F, Reits D, Metselaar M, De Zeeuw CI. Long-term effect of prednisolone on functional blink recovery after transient peripheral facial motor paralysis. Otolaryngol Head Neck Surg 2011; 146:448-54. [PMID: 22063735 DOI: 10.1177/0194599811428029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
OBJECTIVE To determine the functional recovery in patients with severe transient peripheral facial motor paralysis (Bell palsy). STUDY DESIGN Prospective controlled trial. SETTING Academic medical center. SUBJECTS AND METHODS Blink recovery was studied in 2 groups of severely affected Bell palsy patients during a follow-up period of 84 weeks. The patients in one group received prednisolone within the first week after the onset of symptoms. No medication was given to the other group. A control group of healthy subjects was also included. Simultaneous orbicularis oculi muscle activity and eyelid kinematics were recorded by surface electromyographic (EMG) recording and eyelid search coils, respectively. RESULTS At the beginning of the paralysis, very little integrated orbicularis oculi muscle activity and eyelid movement was measured at the palsied side of the face. Thirteen weeks later, the integrated orbicularis oculi EMG and functional blink recovery gradually improved until 39 weeks. Beyond, only the integrated orbicularis oculi EMG slightly increased. At 84 weeks, the integrated orbicularis oculi EMG was significantly larger in the prednisolone group compared with the control group. The integrated EMG of the nonmedicated group recovered to normal values. Curiously enough, the functional blink recovery at the palsied side remained reduced to 64% compared with the healthy controls in the prednisolone-treated group and to 36% in the nonmedicated group. CONCLUSION The authors demonstrate that prednisolone significantly increased the orbicularis oculi muscle activity and significantly improved functional blink recovery in severely affected Bell palsy patients. However, the increase of muscle activity was insufficient to restore functional blinking to normal values.
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Affiliation(s)
- Frans VanderWerf
- Department of Neuroscience, Erasmus MC, Rotterdam, the Netherlands.
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10
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Metselaar M, Thompson KD, Gratacap RML, Kik MJL, LaPatra SE, Lloyd SJ, Call DR, Smith PD, Adams A. Association of red-mark syndrome with a Rickettsia-like organism and its connection with strawberry disease in the USA. J Fish Dis 2010; 33:849-858. [PMID: 20854353 DOI: 10.1111/j.1365-2761.2010.01187.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Red-mark syndrome (RMS), a disease seen mostly in rainbow trout, Oncorhynchus mykiss, is of unknown aetiology. The research presented here indicates the presence of an intracellular bacterium in RMS-affected fish. A positive reaction was observed using immunohistochemistry (IHC) with skin lesions, liver, kidney and spleen of affected fish sampled from several locations within the United Kingdom using two different polyclonal antisera raised against Piscirickettsia salmonis. The same reaction was also seen with a number of different anti-P. salmonis monoclonal antibodies (MAbs). A disease with similar clinical signs to RMS, referred to as strawberry disease (SD), has been reported in the USA. A Rickettsia-like organism (RLO) has recently been associated with SD based on analysis of 16S rDNA sequences. Using the same panel of anti-P. salmonis antibodies used to screen the RMS samples, similar staining was obtained in tissue of SD-affected fish by IHC. A polymerase chain reaction (PCR) using RLO-specific primers was also performed on RMS-affected fish from the United Kingdom, and the samples were positive for the RLO 16S rRNA sequence. These findings suggest that the same aetiological agent may be responsible for RMS in the United Kingdom and SD in the USA.
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Affiliation(s)
- M Metselaar
- Aquatic Vaccine Unit, Institute of Aquaculture, University of Stirling, UK.
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Metselaar M, Maat B, Krijnen P, Verschuure H, Dreschler W, Feenstra L. Comparison of speech intelligibility in quiet and in noise after hearing aid fitting according to a purely prescriptive and a comparative fitting procedure. Eur Arch Otorhinolaryngol 2008; 265:1113-20. [PMID: 18246361 PMCID: PMC2491429 DOI: 10.1007/s00405-008-0596-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2007] [Accepted: 01/21/2008] [Indexed: 11/29/2022]
Abstract
We compared two different types of hearing-aid fitting procedures in a double-blind randomized clinical study. Hearing aid fittings based on a purely prescriptive procedure (the NAL-RP formula) were compared to a comparative fitting procedure based on optimizing speech intelligibility scores. Main outcome measures were improvement of speech intelligibility scores in quiet and in noise. Data were related to the real-ear insertion responses that were measured after fitting. For analysis purposes subgroups were composed according to degree of hearing loss, characterized by unaided speech intelligibility in quiet, previous experience with hearing aids, unilateral or bilateral fittings and type of hearing aid. We found equal improvement of speech intelligibility in quiet, while fitting according to the prescriptive formula resulted in a somewhat better performance as expressed by the speech-to-noise ratio in comparison to the comparative procedure. Both procedures resulted in comparable real-ear insertion responses.
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Affiliation(s)
- Mick Metselaar
- Department of Otolaryngology/Audiology, Erasmus Medical Center, Dr. Molewaterplein 40, Rotterdam, The Netherlands.
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12
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Metselaar M, Maat B, Verschuure H, Dreschler WA, Feenstra L. Comparative studies on hearing aid selection and fitting procedures: a review of the literature. Eur Arch Otorhinolaryngol 2007; 265:21-9. [DOI: 10.1007/s00405-007-0494-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2007] [Accepted: 10/05/2007] [Indexed: 11/28/2022]
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13
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VanderWerf F, Reits D, Smit AE, Metselaar M. Blink recovery in patients with Bell's palsy: a neurophysiological and behavioral longitudinal study. Invest Ophthalmol Vis Sci 2007; 48:203-13. [PMID: 17197534 DOI: 10.1167/iovs.06-0499] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
PURPOSE To examine the recovery process of blinking in a longitudinal study of nine patients severely affected by Bell's palsy. METHODS Kinematics of bilateral eyelid and eye movements and concomitant orbicularis oculi activity during voluntary blinking and air-puff- and acoustic-click-induced reflex blinking were determined by using the magnetic search coil technique and electromyographic recording of the orbicularis oculi muscle (OO-EMG). RESULTS In the first 3 months of absence of OO-EMG activity, reduced eyelid and eye movement of the palsied eyelid were observed during all types of blinking. First OO-EMG activity was determined 3 months after onset of the affliction. After 1 year, OO-EMG activity was normalized and showed values similar to those on the nonpalsied side. Clinically, eyelid movements were normal after 1 year, although corresponding maximum amplitudes and corresponding velocities were two times smaller, expressed in reduced eyelid motility. Directions of eye movement during reflex blinking were normal after 1 year, although maximum amplitudes were smaller on the palsied side. Eye movements during voluntary blinking remained impaired. A simultaneous horizontal upward shift of both eyes in the same direction was recorded throughout the study. CONCLUSIONS Although OO-EMG activity on the palsied side was normalized 1 year after onset of the affliction, the accompanying eyelid movements and their maximum amplitudes and velocities remained smaller throughout the study. The consistent impairment of eye movements in voluntary blinking during the study and reduced motility of eyelid movements indicates that higher brain structures, which modify eyelid and eye movement control during blinking, may be altered by the affliction.
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Affiliation(s)
- Frans VanderWerf
- Department of Neuroscience, ErasmusMC University, PO Box 2040, 3000 CA, Rotterdam, The Netherlands.
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Roosendaal G, Drenth ER, Poerschke M, Verkerk ECM, Van den Berg HM, Metselaar M. Enhanced communication between care professionals and patients with hemophilia by using a web enabled electronic logbook. Stud Health Technol Inform 2004; 103:191-4. [PMID: 15747920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Hemophilia is an X-linked clotting disorder. Treatment consists of intravenous substitution of the missing clotting factor. Although very effective, clotting factor products are very expensive. Most of the clotting factors are administered at home by the patients themselves. Documentation of the amount used and reasons for administrating of these scarce and expensive clotting factors in a paper logbook is a problem. The use of an electronic logbook results in improved compliance in documentation of clotting factor use and therefore in improved quality of treatment of patients with hemophilia.
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Affiliation(s)
- G Roosendaal
- Van Creveldkliniek and the Corporate ICT Department, University Medical Center Utrecht,, P.O.Box 85500, 3508 GA Utrecht, The Netherlands
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