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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="en"><front><journal-meta><journal-id journal-id-type="publisher-id">rpcardio</journal-id><journal-title-group><journal-title xml:lang="en">Rational Pharmacotherapy in Cardiology</journal-title><trans-title-group xml:lang="ru"><trans-title>Рациональная Фармакотерапия в Кардиологии</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1819-6446</issn><issn pub-type="epub">2225-3653</issn><publisher><publisher-name>«SILICEA-POLIGRAF» LLC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.20996/1819-6446-2017-13-3-398-402</article-id><article-id custom-type="elpub" pub-id-type="custom">rpcardio-1492</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="en"><subject>POINT OF VIEW</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ТОЧКА ЗРЕНИЯ</subject></subj-group></article-categories><title-group><article-title>HYPERTHYROIDISM AND ATRIAL FIBRILLATION</article-title><trans-title-group xml:lang="ru"><trans-title>ТИРЕОТОКСИКОЗ И ФИБРИЛЛЯЦИЯ ПРЕДСЕРДИЙ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Марусенко</surname><given-names>И. М</given-names></name><name name-style="western" xml:lang="en"><surname>Marusenko</surname><given-names>I. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Марусенко Ирина Михайловна – д.м.н., профессор кафедры госпитальной терапии</p><p>185000, Петрозаводск, пр. Ленина, 33 </p></bio><bio xml:lang="en"><p>Irina M. Marusenko - MD, PhD, Professor, Chair of Hospital Therapy </p><p>Lenina prosp. 33, Petrozavodsk, 185000</p></bio><email xlink:type="simple">Imarusenko@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Петрова</surname><given-names>Е. Г</given-names></name><name name-style="western" xml:lang="en"><surname>Petrova</surname><given-names>E. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Петрова Елена Григорьевна – врач-эндокринолог</p><p>185007, Петрозаводск, Пирогова ул., 3 </p></bio><bio xml:lang="en"><p>Elena G. Petrova - MD, Endocrinologist </p><p>Pirogova ul. 3, Petrozavodsk, 185007 </p></bio><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Петрозаводский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Petrozavodsk State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Республиканская больница им. В.А. Баранова</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Republican Hospital named after V.A. Baranov</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2017</year></pub-date><pub-date pub-type="epub"><day>04</day><month>07</month><year>2017</year></pub-date><volume>13</volume><issue>3</issue><fpage>398</fpage><lpage>402</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Marusenko I.M., Petrova E.G., 2017</copyright-statement><copyright-year>2017</copyright-year><copyright-holder xml:lang="ru">Марусенко И.М., Петрова Е.Г.</copyright-holder><copyright-holder xml:lang="en">Marusenko I.M., Petrova E.G.</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.rpcardio.online/jour/article/view/1492">https://www.rpcardio.online/jour/article/view/1492</self-uri><abstract><p>Review on a problem of the development of atrial fibrillation in patients with thyrotoxicosis is presented. Thyrotoxicosis is one of the most frequent endocrine diseases, conceding only to a diabetes mellitus. The most frequent reasons of hyperthyroidism are Graves’ disease and functional thyroid autonomy. The authors give an analysis of data on the cardiac effects of thyrotoxicosis, features of heart remodeling under the influence of thyroid hyperfunction, prevalence of atrial fibrillation in thyrotoxicosis, depending on age, as well as the possibility of restoring sinus rhythm in the combination of these diseases. Particular attention is paid to the effect on the heart of subclinical thyrotoxicosis, which is defined as a dysfunction of the thyroid gland, characterized by low serum concentration of thyrotropin, normal values of free thyroxine and free triiodothyronine. Subclinical hyperthyroidism is also capable of causing heart remodeling and diastolic dysfunction.</p><p>Prevalence of thyrotoxicosis in elderly people is higher in areas of iodine deficiency; it is relevant for our country due to the large territory of iodine deficiency. In elderly patients, the cardiac effects of thyrotoxicosis prevail in the clinical picture, that makes it difficult to diagnose endocrine disorders, and correction of thyrotoxicosis is critically important for the successful control of the heart rhythm. The article also discusses the problem of thyrotoxic cardiomyopathy, caused by the toxic effect of excess thyroid hormones: features of this heart disorder, factors affecting its formation, clinical significance and contribution to the development of rhythm disturbances. The greatest significance is the development of atrial fibrillation as a result of thyrotox-icosis in older patients who already have various cardiovascular diseases.</p><p>Atrial fibrillation is the most frequent heart rhythm disorder in thyrotoxicosis. The main cause of arrhythmia in hyperthyroidism is the simultaneous existence of frequent focal impulses and circular motions of the excitation wave – the mechanism re-entry. Successful treatment of atrial fibrillation in patients with thyrotoxicosis is possible only when euthyroidism is achieved. In most cases, after the elimination of thyrotoxicosis, a spontaneous restoration of the sinus rhythm is observed. The chances of sinus rhythm restoration are lower in elderly patients with concomitant organic diseases of the myocardium or long-term atrial fibrillation. Moreover, even radically cured thyrotoxicosis leads to deterioration in the life prognosis.</p></abstract><trans-abstract xml:lang="ru"><p>Представлен обзор литературы по проблеме особенностей развития фибрилляции предсердий у больных тиреотоксикозом, который являетсяодним из наиболее часто встречающихся эндокринных заболеваний, уступая только сахарному диабету. Наиболее частой причиной тиреотоксикоза является болезнь Грейвса и функциональная автономия узла щитовидной железы. Авторы приводят анализ данных литературы окардиальных эффектах тиреотоксикоза, особенностях ремоделирования сердца при гиперфункции щитовидной железы, частоте фибрилляции предсердий при тиреотоксикозе в зависимости от возраста, а также возможностях восстановления синусового ритма при сочетанииданных патологий. Особое внимание уделено влиянию на сердце субклинического тиреотоксикоза, под которым понимают нарушение функции щитовидной железы, характеризующееся низкой сывороточной концентрацией тиротропина, нормальными значениями свободного тироксина и свободного трийодтиронина. Субклинический тиреотоксикоз также способен вызывать ремоделирование сердцаи диастолическую дисфункцию.  Распространенность тиреотоксикоза у пожилых людей выше в районах йоддефицита, что актуально для нашей страны в связи с большой территорией йоддефицита. У пожилых больных кардиальные эффекты тиреотоксикоза преобладают в клинической картине, что затрудняет диагностику эндокринной патологии, а коррекция тиреотоксикоза критически важна для успешного контроля ритма сердца. В статье также обсуждается проблема тиреотоксической кардиомиопатии, вызванной токсическим действием избытка тиреоидных гормонов: особенности данного поражения сердца, факторы, влияющие на его формирование, клиническая значимость и вклад в становление нарушений ритма. Наибольшую значимость имеет развитие фибрилляции предсердий на фоне тиреотоксикоза у пациентов старшей возрастной группы, котораяуже отягощена различными сердечно-сосудистыми заболеваниями.  Фибрилляция предсердий представляет собой наиболее частое нарушение ритма сердца при тиреотоксикозе. В основе формирования аритмии при гиперфункции щитовидной железы лежит одновременное существование частой фокусной импульсации и круговых движений волны возбуждения – механизм re-entry. Успешное лечение фибрилляции предсердий у больных тиреотоксикозом возможно только при достиженииэутиреоза. В большинстве случаев при купировании тиреотоксикоза отмечается спонтанное восстановление синусового ритма. Шансы на восстановление синусового ритма меньше у пожилых пациентов при наличии сопутствующей органической патологии миокарда или длительно существующей фибрилляции предсердий. Следует помнить, что даже радикально излеченный тиреотоксикоз приводит к ухудшению жизненного прогноза.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>тиреотоксикоз</kwd><kwd>фибрилляция предсердий</kwd><kwd>тиреотоксическая кардиомиопатия</kwd><kwd>гипертрофия левого желудочка</kwd></kwd-group><kwd-group xml:lang="en"><kwd>thyrotoxicosis</kwd><kwd>atrial fibrillation</kwd><kwd>thyrotoxic cardiomyopathy</kwd><kwd>left ventricular hypertrophy</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Canaris G., Manowitz N., Mayor G., et al. The Colorado thyroid disease prevalence study. 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