Mounier‐Kuhn Syndrome: a Systematic Analysis of 128 Cases
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The Clinical Respiratory Journal REVIEWREVIEW ARTICLE Mounier-Kuhn syndrome: a systematic analysis of 128 cases published within last 25 years Eduards Krustins1,2 1 Department of Internal Medicine, Pauls Stradins Clinical University Hospital, Riga, Latvia 2 Department of Internal Medicine, Riga Stradins University, Riga, Latvia Abstract Key words Background and Aims: Mounier-Kuhn syndrome is a rare disease with abnormal bronchiectasis – chronic respiratory infections enlargement of major airways, but epidemiological studies are lacking, and cur- – congenital airway disease – COPD – cough – dyspnea rently the most available data about it come from case reports, making it difficult to collate changes in a particular patient to those in previously published cases. Correspondence The aim of this work is to systematically review cases published in the last 25 Eduards Krustins, MD, Department of Internal years and to use descriptive statistics to summarize the patient demographic and Medicine, Pauls Stradins Clinical University clinical information therein in order to acquire details about patient clinical Hospital, 13 Pilsonu Street, LV1002 Riga, characteristics. Latvia. Methods: Cases published in world literature between 1987 and 2013 were sought Tel: 00 371 292 431 48 Fax: +371 67614168 and reviewed according to PRISMA guidelines. Cases were included only if email: [email protected] patient’s age was at least 18 years, and a computed tomography scan with tracheal measurements was available. Received: 28 January 2014 Results: An 8:1 male predominance was found in 89 identified reports (128 cases). Revision requested: 03 July 2014 Mean age was 53.9 years,and average tracheal diameter was 36.1 mm.No correlation Accepted: 22 July 2014 between increasing age and increasing tracheal diameter was found. Bronchiectasis, tracheal diverticulosis and tracheobronchial dyskinesia were common (49.2%, DOI:10.1111/crj.12192 33.6% and 28.9%, respectively). Cough, dyspnea and recurrent respiratory infec- Authorship and contributorship tions (71.1%, 51.6% and 50.8%, respectively) were the most common complaints. E. Krustins is the sole contributor to this Conclusions: The data confirm that syndrome mostly manifests with nonspecific manuscript. respiratory symptoms and is significantly more common in males. Importantly, there was no connection between age and airway diameter, a fact that could mean Ethics that the enlargement does not progress over time, and its severity depends on some Dr. Krustins as the sole author vouches for other yet undetermined factors. scientific integrity of the study and explicitly confirms that the manuscript meets the highest ethical standards for authorship. Please cite this paper as: Krustins E. Mounier-Kuhn Mounier-Kuhn syndrome: a systematic systematic analysis analysis of 128 128 cases cases published published within within last 25 last years. 25Clin years. RespirClin J 2014; Respir ••: ••–••.J 2016; DOI:10.1111/ 10: 3–10. Conflict of interest DOI:10.1111/crj.12192.crj.12192. The author has stated explicitly that there are no conflicts of interest in connection with this article. Abbreviations: COPD chronic obstructive pulmonary disease CT computed tomography MKS Mounier-Kuhn syndrome Introduction visualizations of MKS in computed tomography (CT) were described (2, 3), and although numerous case The Mounier-Kuhn syndrome (MKS), the first case of reports are published every year, there have been very which was described in 1937 (1), is a rare, most likely few attempts to summarize them (4–6). congenital syndrome, whose main characteristic is an To the best of the author’s knowledge, there is no enlarged trachea and main bronchi. In 1988, the first review available that has systematically tried to identify The Clinical Respiratory Journal (2016)(2014) • ISSN 1752-6981 31 V©C 2014 2014 John John Wiley Wiley & & Sons Sons Ltd Ltd Congenital tracheobronchomegaly – statistical review Krustins 129 publicaons idenfied in PubMed 39 publicaons idenfied in other sources (Google Scholar, journal database webpages, reference mining) 168 publicaons screened for eligibility 16 arcles excluded as not containing any case descripons 152 publicaons with 247 cases screened for eligibility (see Table S1) 63 further arcles excluded (no CT scan, paent less than 18 years old, no airway measurements given, arcles that could not be translated, full text not available) 89 publicaons with 128 cases included in this review Figure 1. PRISM flowchart of case selection. the published cases and that would have performed a tory medicine (as listed by online SCIMAGO journal statistical analysis of them. Although individual case rank (8): American Journal of Respiratory and reports and previously published reviews do provide Critical Care Medicine, European Respiratory Journal, information about disease characteristics, symptoms Chest, Thorax and Proceedings of the American and already implemented treatment strategies, they do Thoracic Society) were reviewed for meeting and con- not provide the overview of an issue when it is needed. ference supplement not published elsewhere. Refer- As of MKS it is currently unclear when the dilation of ences of acquired articles were screened for additional the airways start and if (or how) it progresses over publications. time. Patients usually present themselves with a The full texts of the articles identified by the search marked dilation, but the frequently asked question were retrieved and reviewed for conformity with the ‘whether the dilation will increase further?’ currently following inclusion criteria: patient was older than 18 cannot be answered. years; tracheo- or bronchomegaly was confirmed with Therefore, the aim of this review is to clarify the a CT scan according to the criteria published by clinical characteristics of the MKS demographics and Breatnach et al. (9) [the criteria originally were devel- symptoms by systematically searching and reviewing oped for use with conventional chest X-ray, and later cases published within the last 25 years, according to validated for CT by Roditi and Weir (10)]; and at least the PRISMA guidelines for systematic reviews (7). one abnormal tracheal or bronchial measurement clearly was given in the publication. Materials and methods Conference abstracts were included only if no sub- sequent publication of the particular case could be PubMed, ScienceDirect and GoogleScholar data- found and if the case met all inclusion criteria men- bases were searched for publications of MKS case tioned above. For the flowchart of case selection, see reports by using terms ‘Mounier-Kuhn syndrome’, Fig. 1. Information about the demographics of the ‘tracheomegaly’, ‘bronchomegaly’ and ‘tracheobron- patient, smoking history (pack years were calculated if chomegaly’. Time was restricted to cases published data were available), airway size, patient’s complaints between January 1987 and December 2012. Articles in and lung ventilation function was searched for in the Japanese, Chinese and Korean were excluded as it was case reports that were included. After the data collec- not possible to translate them. Additionally, the web tion was completed, in a small random sample of 13 pages of the five most influential journals of respira- cases (10%), the gathered information was compared 24 The Clinical Respiratory Journal (2014)(2016) • ISSN 1752-6981 ©VC 2014 John Wiley & Sons Ltd Krustins Congenital tracheobronchomegaly – statistical review Figure 2. Age and gender frequencies for patients diagnosed with Mounier- Kuhn syndrome (MKS). once again with the case reports to check for accuracy (with reasons for exclusion, where applicable) may be – no errors were detected. The final data table was found online at the publisher’s website. analysed using SPSS 20.0 (IBM Corporation, Armonk, There were 114 (89,1%) male and 14 female NY, USA) computer program. Acquired data were (10,9%) patients (a ratio of 8.1:1). The distribution of checked for normality and depending on the results age (Shapiro–Wilk test, P = 0.000) and other continu- either parametric (Student’s t-test, Pearson’s coeffi- ous variables were found to be nonnormal; there- cient of correlation) or nonparametric tests (Mann– fore, nonparametric tests were used for analyses. The Whitney U-test, Spearman’s rank correlation) were average age was 53.9 years, and males were slightly applied. Results of calculations were rounded to one younger than females (53.8 vs 54.9 years, respectively), decimal place. Where information was missing the but this difference was not statistically significant available data was summarized. (P = 0.7, Mann–Whitney U-test). Fig. 2 shows number of patients per age group. Further details about the age Results distribution can be seen in Table 1. The average tracheal size was 36 mm (median and The search in PubMed identified 129 publications mode 34 mm, min 25 mm, max 65 mm). There was no since 1987, and 39 additional publications were found correlation between the patient’s age and tracheal with other methods, with both groups mentioning 173 and/or bronchial diameter, but a weak correlation and 74 cases of MKS, respectively (247 cases in a total could be observed between the tracheal and/or bron- of 168 publications). Sixteen publications were chial diameter and the duration of disease (as defined excluded as the full text of the article could not be by the length of complaints, ρ=0.22, P = 0.045). In acquired. An additional 63 publications did not meet 29.7% (n = 38) of the cases only the tracheal dimen- the inclusion