A longitudinal evaluation of hearing and ventilation tube insertion in patients with primary ciliary dyskinesia
Introduction
Primary ciliary dyskinesia (PCD) is an autosomal recessive, heterogenous group of disorders of ciliary ultrastructure and function [1], [2]. Most studies report a prevalence of 1:10,000 to 1:30,000 [3], [4]; however, many mild PCD phenotypes may remain undiagnosed indicating a higher prevalence [5]. Approximately 50% of the patients has Kartagener's syndrome characterized by the triad: chronic rhinosinusitis, bronchiectasis and situs inversus [6].
PCD is mainly an oto-sino-pulmonary disease. Common manifestations include otitis media with effusion (OME), rhinitis, chronic rhinosinusitis [5], [7] and recurrent or chronic lung infections [8] with declining lung function [9], [10].
OME in PCD is believed predominantly to be caused by the dysfunctional cilia and decreased mucociliary clearance in the Eustachian tube and middle ear [11], [12]. Previous studies of non-syndromic patients have suggested allergy [13], blockage of the Eustachian tube [14], [15] and infections of both bacteria [16], [17] and viruses [18], [19] as causes for negative ear pressure ensuing effusion and these may also contribute to the pathogenesis of OME in PCD patients. OME is a global health problem and the most common cause of acquired hearing loss in children [20]. It affects 10–30% of 1–3 year olds and 1.5–3.1% of 5–7 year olds [21], [22]. In chronic OME, fluid without signs of inflammation persists in the middle ear for at least 12 weeks. The middle ear fluid reduces the transmission of sound through the middle ear leading to conductive hearing loss. Evidence from other contexts suggests that bilateral chronic middle ear effusion can significantly impair hearing, speech development and quality of life [23], [24], [25], [26].
A major concern in PCD is persistent hearing loss that is linked to OME, which may persist into adulthood. Previous studies have shown that 81–95% of PCD patients have recurrent otitis media [7], [11] and more than 80% of PCD patients have OME, which may not resolve with age [27], [28].
Timely treatment of OME medically, with hearing aids, otovent [29] or with ventilation tubes (VT) is important to improve hearing and to prevent delayed speech and language development; however, treatment of OME in PCD is controversial and existing studies are conflicting [30]. VT insertion can improve hearing [27], [30], [31] but also lead to post-operative prolonged otorrhoea in 33–100% of patients with PCD [28], [30]. In comparison, the prevalence of chronic otorrhoea in the general population after VT insertion is reported to be approximately four percent [32]. Further, PCD patients hearing loss may resolve spontaneously [33] and normalize before 12 years of age [27], [34] suggesting conservative treatment of OME in PCD.
However, some reports question this spontaneous normalization of the middle ear and hearing in PCD. Sommer et al. [7] concludes that hearing does not resolve with age and other studies [28], [33], [35] have found that OME persists into adulthood promoting VT insertion as a treatment option, since complications as otorrhoea can be relatively easy treated.
The existing literature concerning the natural history of OME and OME management in PCD is conflicting [7], [28], [30], [36]. Conclusions are based on cross-sectional studies [7], [27], [31], [33], [34], [36], [37], [38] and only one longitudinal retrospective study including relatively few audiometries [28]. The primary aim of the present study was to evaluate the hearing level longitudinally in PCD patients. A secondary aim was to determine the effect of VT insertion on hearing and the extent of the following otorrhoea.
Section snippets
Study design
We performed a longitudinal retrospective observational study, where we investigated the hearing level and middle ear function of all patients with definitive PCD diagnosis and at least one evaluable audiometry performed at the Department of Otorhinolaryngology, Head & Neck Surgery and Audiology, Copenhagen University Hospital, Rigshospitalet, Denmark during a 30-years period (1985–2015).
Patients
All Danish PCD patients are affiliated with the Danish PCD Centre at Rigshospitalet, Copenhagen. Annual
Patients and follow-up
A total of 57 PCD patients were included in the study (30 males and 27 females, median age 13 years, range 2–72 years). A total of 300 audiometries on 600 ears were evaluated. Twenty-two audiometries were excluded because of missing VT/perforation status, resulting in 278 evaluable audiometries on 556 ears. The median number of audiometries per patient was 3 (range 1–29) and the median follow-up was 60 months (range 0–351 months).
The median number of audiometries per age group was 77 (range
Discussion
In this retrospective study we present an evaluation of the hearing longitudinally in the Danish cohort of PCD patients during a 30-year period. We also present data concerning the consequences of VT insertion on hearing and postoperative otorrhoea.
In agreement with previous studies [4], [28], [31], [35], we found a high prevalence of OME in preschool children (83% in children below 5 years) and that OME often persisted into adulthood in PCD patients. Nevertheless, we found significant improved
Conclusion
In conclusion, hearing improved as a function of age as well as following VT insertion in PCD patients. However, VT insertion is associated with high incidences of prolonged otorrhoea. Existing literature are of low level evidence and prospective randomized controlled trials are needed to elucidate the role of VT in the treatment of OME in PCD.
Funding
The Candys Foundation, a non-profit organisation, supported Mikkel Christian Alanin, M.D. as a PhD stipend.
Acknowledgement
We thank audiology assistants Anne Marie Jensen and Gerd Hansen for their dedication to the project. Professor Torben Martinussen, department of Biostatistics, University of Copenhagen is thanked for statistical advice.
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