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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">ppharm</journal-id><journal-title-group><journal-title xml:lang="ru">Педиатрическая фармакология</journal-title><trans-title-group xml:lang="en"><trans-title>Pediatric pharmacology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1727-5776</issn><issn pub-type="epub">2500-3089</issn><publisher><publisher-name>Издательство «ПедиатрЪ»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.15690/pf.v23i1.3008</article-id><article-id custom-type="elpub" pub-id-type="custom">ppharm-2750</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>КЛИНИЧЕСКИЙ СЛУЧАЙ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>CASE REPORT</subject></subj-group></article-categories><title-group><article-title>Нарушения слуха при альфа-маннозидозе (серия клинических случаев)</article-title><trans-title-group xml:lang="en"><trans-title>Hearing Impairment in Alpha-Mannosidosis: Case Series</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0003-1411-7656</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Голева</surname><given-names>М. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Goleva</surname><given-names>M. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Голева Мария Алексеевна</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Mariya A. Goleva – MD.</p><p>Saint Petersburg</p></bio><email xlink:type="simple">goleva.m.a@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8453-2789</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мефодовская</surname><given-names>Е. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Mefodovskaya</surname><given-names>E. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Мефодовская Елизавета Константиновна - к.м.н.</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Elizaveta K. Mefodovskaya, MD, PhD.</p><p>Saint Petersburg</p></bio><email xlink:type="simple">surdologist@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5131-2253</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Снегова</surname><given-names>Е. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Snegova</surname><given-names>E. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Снегова Евгения Владимировна</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Evgeniya V. Snegova – MD.</p><p>Saint Petersburg</p></bio><email xlink:type="simple">snegova.e.v@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-3390-7512</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Медведева</surname><given-names>Н. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Medvedeva</surname><given-names>N. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Медведева Надежда Анатольевна - к.м.н.</p><p>Санкт-Петербург</p></bio><bio xml:lang="en"><p>Nadezhda A. Medvedeva - MD, PhD.</p><p>Saint Petersburg</p></bio><email xlink:type="simple">nadezhdamed@mail.ru</email><xref ref-type="aff" rid="aff-3"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6809-7764</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Туфатулин</surname><given-names>Г. Ш.</given-names></name><name name-style="western" xml:lang="en"><surname>Tufatulin</surname><given-names>G. Sh.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Туфатулин Газиз Шарифович - доктор медицинских наук, главный врач Санкт-Петербургского Детского городского сурдологического центра, доцент кафедры оториноларингологии Северо-Западного ГМУ им. И.И. Мечникова, советник директора Санкт-Петербургского научно-исследовательского института уха, горла, носа и речи.</p><p>194356, Санкт-Петербург, ул. Есенина, д. 26, корп. 4, тел.: +7 (812) 446-47-07, +7 (981) 745-35-55</p></bio><bio xml:lang="en"><p>Gaziz Sh. Tufatulin - MD, PhD.</p><p>26, Esenina Str., building 4, St. Petersburg, 194356, +7 (812) 446-47-07</p></bio><email xlink:type="simple">dr.tufatulin@mail.ru</email><xref ref-type="aff" rid="aff-4"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Детский городской сурдологический центр</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Children’s City Audiology Center</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Консультативно-диагностический центр для детей</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Consultative and Diagnostic Center for Children</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru"><institution>Санкт-Петербургский государственный педиатрический медицинский университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Saint Petersburg State Pediatric Medical University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-4"><aff xml:lang="ru"><institution>Детский городской сурдологический центр; Санкт-Петербургский научно-исследовательский институт уха, горла, носа и речи; Северо-Западный государственный медицинский университет им. И.И. Мечникова; Российская медицинская академия непрерывного последипломного образования</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Children’s City Audiology Center; Saint-Petersburg Research Institute of Ear, Throat, Nose and Speech; Mechnikov North-Western State Medical University; Russian Medical Academy of Postgraduate Education</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>06</day><month>02</month><year>2026</year></pub-date><volume>23</volume><issue>1</issue><fpage>6</fpage><lpage>13</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Голева М.А., Мефодовская Е.К., Снегова Е.В., Медведева Н.А., Туфатулин Г.Ш., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Голева М.А., Мефодовская Е.К., Снегова Е.В., Медведева Н.А., Туфатулин Г.Ш.</copyright-holder><copyright-holder xml:lang="en">Goleva M.A., Mefodovskaya E.K., Snegova E.V., Medvedeva N.A., Tufatulin G.S.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.pedpharma.ru/jour/article/view/2750">https://www.pedpharma.ru/jour/article/view/2750</self-uri><abstract><sec><title>Обоснование</title><p>Обоснование. Альфа-маннозидоз — редкое наследственное заболевание из группы лизосомных болезней накопления, для которого характерен широкий спектр клинических проявлений, включая нарушение слуха, часто являющееся одним из первых симптомов. Смешанный характер тугоухости, а также полиморфность клинической картины обусловливают трудности диагностики. Целью данной работы является анализ клинических случаев для повышения настороженности врачей в отношении альфа-маннозидоза.</p><p>Описание клинических случаев. Представлены два клинических случая альфа-маннозидоза 2-го типа у детей. В первом случае у девочки 3 лет 5 мес на фоне задержки психомоторного развития и характерного фенотипа была диагностирована двусторонняя смешанная тугоухость IV степени. Междисциплинарный подход и настороженность сурдолога позволили своевременно провести биохимическую и генетическую диагностику (выявлен гомозиготный патогенный вариант c.2248C&gt;T в гене MAN2B1) 6 и начать ферментозаместительную терапию в возрасте 3 лет 10 мес. Во втором случае у двух родных сестер, рожденных в результате близкородственного брака, диагностика была отсроченной: нарушение слуха и задержка речевого развития выявлены поздно, слухопротезирование проведено с задержкой, отмечалась низкая комплаентность. Генетически подтверждены крупные делеции в гене MAN2B1. Позднее начало лечения и возраст первичного слухопротезирования обусловили отсутствие значимой положительной динамики в слухоречевом развитии.</p></sec><sec><title>Заключение</title><p>Заключение. Приведенные случаи демонстрируют критическую важность ранней диагностики альфа-маннозидоза. «Необъяснимая» смешанная или сенсоневральная тугоухость, особенно в сочетании с задержкой психомоторного развития, дисморфическими чертами лица и рецидивирующими средними отитами, требует исключения лизосомных болезней накопления. Своевременное междисциплинарное обследование, включая определение активности лизосомных ферментов, позволяет верифицировать диагноз и начать патогенетическую терапию, что улучшает прогноз заболевания.</p></sec></abstract><trans-abstract xml:lang="en"><sec><title>Background</title><p>Background. Alpha-mannosidosis is a rare hereditary disorder belonging to the group of lysosomal storage diseases, characterized by a wide spectrum of clinical manifestations, including hearing impairment, which is often one of the first symptoms. The mixed nature of hearing loss, along with the polymorphism of the clinical presentation, contributes to diagnostic difficulties. The aim of this study is to analyze case series to raise awareness among physicians about alpha-mannosidosis.</p></sec><sec><title>Case series</title><p>Case series: Two case reports of type 2 alpha-mannosidosis in children are presented. In the first case report, a 3-year-5-month-old girl with psychomotor developmental delay and a specific phenotype was diagnosed with bilateral severe hearing loss. An interdisciplinary approach and the vigilance of an audiologist allowed for timely biochemical and genetic diagnostics (a homozygous pathogenic variant c.2248C&gt;T in the MAN2B1 gene was identified) and the initiation of enzyme replacement therapy at the age of 3 years 10 months. In the second case report, diagnosis was delayed in two sisters born from a consanguineous marriage: hearing impairment and speech development delay were identified late, hearing aids were provided with a delay, and low compliance was noted. Large deletions in the MAN2B1 gene were genetically confirmed. The late initiation of treatment and the age of primary hearing aid fitting resulted in a lack of significant positive dynamics in auditory-verbal development.</p></sec><sec><title>Conclusion</title><p>Conclusion. The presented case series highlight the critical importance of early diagnosis of alpha-mannosidosis. “Unexplained” mixed or sensorineural hearing loss, especially when combined with psychomotor developmental delay, dysmorphic facial features, and recurrent otitis media, requires the exclusion of lysosomal storage disorders. Timely interdisciplinary examination, including assessment of lysosomal enzyme activity, enables diagnosis verification and initiation of pathogenetic therapy, thereby improving the disease prognosis.</p></sec></trans-abstract><kwd-group xml:lang="ru"><kwd>альфа-маннозидоз</kwd><kwd>тугоухость</kwd><kwd>MAN2B1</kwd></kwd-group><kwd-group xml:lang="en"><kwd>alpha-mannosidosis</kwd><kwd>hearing loss</kwd><kwd>MAN2B1</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Отсутствует</funding-statement><funding-statement xml:lang="en">Not specified</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Beck M, Olsen KJ, Wraith JE, et al. Natural history of alpha mannosidosis a longitudinal study. 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