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Virusnyj gepati t V gepatit b b angl Hepatitis B antroponoznoe virusnoe zabolevanie vyzyvaemoe vozbuditelem s vyrazhennymi gepatotropnymi svojstvami virus gepatita B v specialnoj literature ego mogut oboznachat virus GV VGV ili HBV iz semejstva gepadnavirusov Virusnyj gepatit BElektronnaya mikrofotografiya virusa gepatita BMKB 11 1E50 1 1E51 0 KA62 9MKB 10 B16 B18 0 B18 1MKB 9 070 2 070 3MKB 9 KM 070 30OMIM 610424DiseasesDB 5765MedlinePlus 000279eMedicine med 992 ped 978MeSH D006509 Mediafajly na Vikisklade Poverhnostnyj antigen gepatita B otkryl v 1964 godu amerikanskij vrach i virusolog Baruh Samuel Blamberg pri izuchenii obrazcov krovi avstralijskogo aborigena poluchivshij v posleduyushem za issledovaniya gepatita B Nobelevskuyu premiyu po fiziologii ili medicine v 1976 godu Virus otlichaetsya chrezvychajno vysokoj ustojchivostyu k razlichnym fizicheskim i himicheskim faktoram nizkim i vysokim temperaturam v tom chisle kipyacheniyu mnogokratnomu zamorazhivaniyu i ottaivaniyu dlitelnomu vozdejstviyu kisloj sredy Vo vneshnej srede pri komnatnoj temperature virus gepatita B mozhet sohranyatsya do neskolkih nedel v pyatnah krovi na lezvii britvy konce igly V syvorotke krovi pri temperature 30 S infekcionnost virusa sohranyaetsya v techenie 6 mesyacev pri temperature 20 S okolo 15 let v suhoj plazme 25 let Inaktiviruetsya pri avtoklavirovanii v techenie 30 minut sterilizacii suhim zharom pri temperature 160 S v techenie 60 minut progrevanii pri 60 S v techenie 10 chasov EtiologiyaZabolevanie vyzyvaetsya virusom gepatita B Stroenie virusa Struktura virusa gepatita B Virus gepatita B HBV yavlyaetsya chlenom semejstva gepadnavirusov Virusnaya chastica virion sostoit iz vneshnej lipidnoj obolochki i yadra ikosaedricheskogo nukleokapsida sostoyashego iz yadra belka Eti viriony imeyut diametr 30 42 nm Nukleokapsid vklyuchaet virusnuyu DNK i angl kotoraya obladaet aktivnostyu obratnoj transkriptazy Vneshnyaya obolochka soderzhit vstroennye belki kotorye uchastvuyut v svyazyvanii virusov i proniknovenii v chuvstvitelnye kletki Virus gepatita B odin iz samyh malenkih virusov zhivotnyh v obolochke Viriony razmerom 42 nm kotorye sposobny inficirovat gepatocity nazyvayutsya chasticami Dejna Pomimo chastic Dejna v syvorotke inficirovannyh lyudej mozhno obnaruzhit nitevidnye i sfericheskie tela bez yadra Eti chasticy ne yavlyayutsya infekcionnymi i sostoyat iz lipidov i belkov kotorye obrazuyut chast poverhnosti viriona nazyvaemogo poverhnostnymi antigenami angl i vyrabatyvayutsya v izbytke v techenie zhiznennogo cikla virusa Genom Genomnaya organizaciya virusa gepatita b Geny perekryvayutsya Genom HBV sostoit iz kolcevoj DNK no eto neobychno potomu chto DNK ne yavlyaetsya polnostyu dvuhcepochechnoj Odin konec polnorazmernoj cepi svyazan s virusnoj DNK polimerazoj Dlina genoma sostavlyaet 3020 3320 nukleotidov dlya polnorazmernoj cepi i 1700 2800 nukleotidov dlya korotkoj cepi Negativno smyslovaya nekodiruyushaya komplementarna virusnoj mRNK Virusnaya DNK obnaruzhivaetsya v yadre vskore posle zarazheniya kletki Chastichno dvuhcepochechnaya DNK stanovitsya polnostyu dvuhcepochechnoj za schet zaversheniya edinichnoj cepi i udaleniya belkovoj molekuly iz edinichnoj cepi i korotkoj posledovatelnosti RNK iz edinichnoj cepi Nekodiruyushie osnovaniya udalyayutsya s koncov edinichnoj cepi i koncy soedinyayutsya zanovo Sushestvuet chetyre izvestnyh gena kodiruemyh genomom kotorye nazyvayutsya C X P i S Osnovnoj belok kodiruetsya genom C angl i ego nachalnomu geneticheskomu kodu predshestvuet raspolozhennyj vyshe startovyj geneticheskij kod AUG v ramke schityvaniya ot kotorogo produciruetsya pre yadrovyj belok angl produciruetsya proteoliticheskim processingom pre yadrovogo belka V nekotoryh redkih shtammah virusa izvestnyh kak preyadrovye mutanty virusa gepatita B HBeAg otsutstvuet DNK polimeraza kodiruetsya genom P Gen S eto gen kodiruyushij poverhnostnyj antigen HBsAg Gen HBsAg predstavlyaet soboj odnu dlinnuyu otkrytuyu ramku schityvaniya no soderzhit tri geneticheskih koda v startovoj ramke ATG kotorye delyat gen na tri uchastka pre S1 pre S2 i S Iz za mnozhestvennyh startovyh geneticheskih kodov polipeptidy treh proizvodyatsya raznye razmery nazyvaemye bolshimi poryadok ot poverhnosti vnutr pre S1 pre S2 i S srednimi pre S2 S i malenkimi S Na aminokoncevom konce preS1 chasti bolshogo L belka est miristilnaya gruppa kotoraya igraet vazhnuyu rol v infekcii V dopolnenie k etomu N konec L belka imeet sajty svyazyvaniya virusa i svyazyvaniya kapsida Iz za etogo N koncy poloviny molekul L belka raspolozheny vne membrany a drugaya polovina vnutri membrany Funkciya belka kodiruemogo genom X do konca ne izuchena no svyazana s razvitiem raka pecheni On stimuliruet geny kotorye sposobstvuyut rostu kletok i inaktiviruet molekuly reguliruyushie rost Razmnozhenie virusa Replikaciya virusa gepatita B Zhiznennyj cikl virusa gepatita B slozhen Gepatit B odin iz nemnogih izvestnyh pararetrovirusov neretrovirusov kotorye vse eshe ispolzuyut obratnuyu transkripciyu v processe svoej replikacii Virus pronikaet v kletku svyazyvayas s NTCP na poverhnosti i podvergayas endocitozu Poskolku virus razmnozhaetsya s pomoshyu RNK sozdannoj fermentom hozyainom virusnaya genomnaya DNK dolzhna perenositsya v yadro kletki s pomoshyu belkov hozyaev nazyvaemyh shaperonami Chastichno dvuhcepochechnaya virusnaya DNK zatem prevrashaetsya v polnostyu dvuhcepochechnuyu virusnuyu polimerazu i transformiruetsya v kovalentno zamknutuyu kolcevuyu DNK kzkDNK Eta kzkDNK sluzhit matricej dlya transkripcii chetyreh virusnyh mRNK s pomoshyu RNK polimerazy hozyaina Samaya bolshaya mRNK kotoraya dlinnee virusnogo genoma ispolzuetsya dlya sozdaniya novyh kopij genoma i dlya sozdaniya belka yadra kapsida i virusnoj DNK polimerazy Eti chetyre virusnyh transkripta podvergayutsya dopolnitelnoj obrabotke i prodolzhayut formirovat viriony potomstva kotorye vysvobozhdayutsya iz kletki ili vozvrashayutsya v yadro i recikliruyutsya chtoby proizvesti eshe bolshe kopij Zatem dlinnaya mRNK transportiruetsya obratno v citoplazmu gde belok R viriona DNK polimeraza sinteziruet DNK za schet svoej aktivnosti obratnoj transkriptazy Serotipy i genotipy Virus delitsya na chetyre osnovnyh serotipa adr adw ayr ayw na osnove antigennyh epitopov predstavlennyh na ego belkah obolochki i na vosem osnovnyh genotipov A H Genotipy imeyut chetkoe geograficheskoe raspredelenie i ispolzuyutsya dlya otslezhivaniya evolyucii i peredachi virusa Razlichiya mezhdu genotipami vliyayut na tyazhest zabolevaniya techenie i veroyatnost oslozhnenij a takzhe reakciyu na lechenie i vozmozhno vakcinaciyu Est dva drugih genotipa I i J no oni ne yavlyayutsya obsheprinyatymi po sostoyaniyu na 2015 god Raznoobrazie genotipov ne proyavlyaetsya odinakovo v mire Naprimer genotipy A D i E v osnovnom nablyudalis v Afrike v to vremya kak genotipy B i C nablyudalis v Azii kak shiroko rasprostranennye Genotipy razlichayutsya po krajnej mere na 8 svoej posledovatelnosti i vpervye o nih bylo soobsheno v 1988 godu kogda bylo pervonachalno opisano shest A F S teh por byli opisany eshe dva tipa G i H Bolshinstvo genotipov teper delyatsya na subgenotipy s razlichnymi svojstvami EpidemiologiyaInkubacionnyj period vremya s momenta zarazheniya do poyavleniya simptomov gepatita B sostavlyaet v srednem 12 nedel no mozhet kolebatsya v predelah ot 2 do 6 mesyacev Mehanizm peredachi infekcii Virus prisutstvuet v krovi i razlichnyh biologicheskih zhidkostyah slyune moche sperme vlagalishnom sekrete menstrualnoj krovi i dr Kontagioznost zaraznost virusa gepatita B v 50 100 raz vyshe chem u VICh inficiruyushaya doza sostavlyaet 0 0000001 ml syvorotki soderzhashej VGV Virus gepatita B mozhet vyzhivat do 7 dnej vne tela cheloveka pri komnatnoj temperature na predmetah poverhnostyah okruzhayushej sredy Virus gepatita B peredaetsya ot cheloveka k cheloveku cherez krov spermu ili drugie biologicheskie zhidkosti Gepatit B ne rasprostranyaetsya cherez grudnoe moloko pishu ili vodu stolovye prinadlezhnosti vo vremya obyatij poceluev cherez rukopozhatie pri kashle chihanii ili ukusah nasekomyh Takzhe nevozmozhno zarazitsya pri ispolzovanii obshej posudy postelnogo belya Puti peredachi gepatita B Parenteralnyj put cherez krov posredstvom nesterilnyh instrumentov pri manikyure pirsinge tatu stomatologii Polovoj put Vertikalnyj put ot materi k rebenku Bytovoj put pri sovmestnom ispolzovanii zubnoj shetki britvy Takim obrazom dlya zarazheniya vzroslogo nevakcinirovannogo cheloveka neobhodimo proniknovenie virusa v krov pri perelivanii krovi cherez ranu i krovotechenie v tom chisle v rotovoj polosti cherez instrumenty seks zubnuyu shetku britvu i lichnye predmety Parenteralnyj put osushestvlyaetsya cherez medicinskij laboratornyj instrumentarij i izdeliya medicinskogo naznacheniya kontaminirovannye VGV Zarazhenie virusnym gepatitom B mozhet proishodit takzhe pri perelivaniyah krovi i ili eyo komponentov pri nalichii v nih VGV V peredache virusnogo gepatita B znachitelnoe mesto zanimayut nemedicinskie invazivnye procedury v organizaciyah bytovogo obsluzhivaniya parikmaherskih manikyurnyh pedikyurnyh kosmetologicheskih v kabinetah tatuirovki pirsinga i prochih invazivnyh procedur a takzhe inekcionnaya narkomaniya Polovoj put V poslednie gody vsyo bolshee znachenie v razvityh stranah priobretaet polovoj put peredachi virusa chto obuslovleno vo pervyh snizheniem znacheniya parenteralnogo puti poyavlenie razovogo instrumentariya primenenie effektivnyh dezinficiruyushih sredstv rannim vyyavleniem bolnyh donorov vo vtoryh tak nazyvaemoj seksualnoj revolyuciej chastoj smenoj polovyh partnyorov praktikovaniem analnyh kontaktov soprovozhdayushihsya bolshej travmatizaciej slizistyh i sootvetstvenno vozrastaniem riska popadaniya virusa v krovotok Rasprostranenie narkomanii takzhe igraet bolshuyu rol poskolku vnutrivennye narkomany vhodyat v gruppu vysokogo riska i chto nemalovazhno oni ne yavlyayutsya izolirovannoj gruppoj i s lyogkostyu vstupayut v besporyadochnye nezashishyonnye polovye otnosheniya s drugimi lyudmi Vertikalnyj put Schitaetsya chto bolee poloviny vseh sluchaev zarazheniya HBV prihoditsya na vertikalnyj put peredachi Etot put osobenno rasprostranen v stranah s vysokim obshim urovnem inficirovannosti naseleniya Nesmotrya na dostignutye uspehi svyazannye prezhde vsego s vvedeniem massovoj immunoprofilaktiki novorozhdennyh ot 1 do 14 novorozhdennyh inficiruetsya HBV vertikalnym putem Etot put peredachi imeet osoboe znachenie tak kak risk formirovaniya HGV napryamuyu svyazan s vozrastom v kotorom proizoshlo inficirovanie Pri vertikalnom puti peredachi u 80 90 detej formiruetsya HGV 1 3 v to vremya kak pri zarazhenii detej v vozraste do 6 let risk razvitiya HGV sostavlyaet 30 a pri inficirovanii v starshem vozraste etot risk snizhaetsya do 12 Ponyatie vertikalnoj peredachi vklyuchaet v sebya vse puti peredachi infekcii ot materi k rebenku Peredacha HBV infekcii tradicionno rassmatrivaetsya kak perinatalnoe inficirovanie to est inficirovanie v period s 28 nedel gestacii do 28 dnej posle rodov tak kak imenno v etot period naibolee chasto proishodit zarazhenie Dlya inficirovaniya proizoshedshego vne etogo perioda dannyj termin ne podhodit Takim obrazom pravilnee ispolzovat terminy peredacha ot materi rebenku ili vertikalnaya peredacha kotorye vklyuchayut vse vremya vozmozhnogo inficirovaniya vo vremya beremennosti vo vremya rodov i v rannem detstve Sushestvuet tri vozmozhnyh puti peredachi HBV infekcii ot materi rebenku Prenatalno vnutriutrobno ili transplacentarno Intranatalno vo vremya rodov Postnatalno vo vremya uhoda za detmi ili pri grudnom vskarmlivanii Soglasno Nacionalnoj programme optimizacii vskarmlivaniya detej pervogo goda zhizni v RF 2019 goda izdaniya Pri gepatite B u zhenshin grudnoe vskarmlivanie vozmozhno pri provedenii vakcinacii v sochetanii s vvedeniem specificheskogo immunoglobulina posle rozhdeniya rebenka Veroyatnost inficirovaniya virusom gepatita C cherez grudnoe moloko minimalna No pri ostrom techenii gepatita B i C a takzhe v sluchae razvitiya mastita ili pri krovotochivosti soskov grudnoe vskarmlivanie sleduet vremenno prekratit Bytovoj put Pri bytovom puti zarazheniya inficirovanie proishodit v seme blizhajshem okruzhenii i v organizovannyh kollektivah Opasnost predstavlyayut polzovanie obshimi britvami lezviyami manikyurnymi prinadlezhnostyami zubnymi shyotkami i t d Soprikosnovenie s predmetami soderzhashimi virus povrezhdennoj poverhnostyu porez potyortost treshinka vospalenie kozhi prokol ozhog i t p mozhet predstavlyat risk zarazheniya dlya nevakcinirovannogo cheloveka Rasprostranyonnost Inficirovanie virusom gepatita B HBV ostaetsya globalnoj problemoj zdravoohraneniya i po ocenkam VOZ v 2019 g v mire naschityvalos 296 millionov chelovek zhivushih s hronicheskoj infekciej gepatita B t e s polozhitelnym rezultatom testirovaniya na poverhnostnyj antigen gepatita B Rasprostranennost gepatita B yavlyaetsya naibolee vysokoj v Regione Zapadnoj chasti Tihogo okeana VOZ i Afrikanskom regione VOZ gde inficirovano sootvetstvenno 6 2 i 6 1 vzroslogo naseleniya V regionah Vostochnogo Sredizemnomorya Yugo Vostochnoj Azii i Evropejskom regione VOZ inficirovano sootvetstvenno 3 3 2 0 i 1 6 naseleniya Nakonec v Regione stran Ameriki VOZ etot pokazatel sostavlyaet 0 7 PatogenezVozbuditel pronikaet v organizm cheloveka cherez povrezhdennuyu kozhu ili slizistye obolochki dalee s tokom krovi zanositsya v pechen gde proishodit ego replikaciya Virus gepatita B ne okazyvaet pryamogo citoliticheskogo dejstviya na gepatocity Povrezhdenie kletok pecheni oposredovano immunopatologicheskimi reakciyami makroorganizma za schyot chego i otmechaetsya bolee vyrazhennyj nekroz gepatocitov Techenie infekcionnogo processa vo mnogom zavisit ot replikativnoj aktivnosti virusa Vozbuditel virusnogo gepatita B sposoben dlitelnoe vremya ostavatsya v organizme formiruya ne tolko virusonositelstvo no i vyzyvaya razvitie hronicheskogo gepatita KlinikaOstraya infekciya virusom gepatita B svyazana s ostrym virusnym gepatitom zabolevaniem kotoroe nachinaetsya s obshego plohogo samochuvstviya poteri appetita toshnoty rvoty lomoty v tele umerennoj temperatury i temnogo cveta mochi a zatem progressiruet do razvitiya zheltuhi Bolezn dlitsya neskolko nedel a zatem u bolshinstva bolnyh postepenno prohodit Nekotorye lyudi mogut imet bolee tyazheluyu formu zabolevaniya pecheni izvestnuyu kak fulminantnaya pechenochnaya nedostatochnost kotoraya mozhet zavershitsya smertelnym ishodom Infekciya mozhet protekat bessimptomno i ne raspoznavatsya Vsya simptomatika virusnogo gepatita B obuslovlena intoksikaciej vsledstvie snizheniya detoksikacionnoj funkcii pecheni i holestazom narusheniem ottoka zhelchi Prichyom predpolagaetsya kem chto u odnoj gruppy bolnyh prevaliruet ekzogennaya intoksikaciya ot toksinov postupayushih s syroj edoj ili obrazuyushihsya pri pishevarenii v kishechnike a u drugoj gruppy bolnyh prevaliruet endogennaya ot toksinov obrazuyushiesya v rezultate metabolizma v sobstvennyh kletkah i pri nekroze gepatocitov Poskolku k lyubym toksinam chuvstvitelna v pervuyu ochered nervnaya tkan v chastnosti nejrocity golovnogo mozga prezhde vsego nablyudaetsya cerebrotoksicheskij effekt chto privodit k povyshennoj utomlyaemosti narusheniyu sna pri lyogkih formah ostrogo i hronicheskom gepatite i sputannosti soznaniya Hronicheskaya infekciya virusom gepatita B mozhet protekat bessimptomno ili byt svyazana s hronicheskim vospaleniem pecheni hronicheskij gepatit privodyashim k cirrozu v techenie neskolkih let Etot tip infekcii rezko uvelichivaet zabolevaemost gepatocellyulyarnoj karcinomoj GCK rak pecheni Po vsej Evrope gepatity B i C vyzyvayut primerno 50 gepatocellyulyarnyh karcinom Hronicheskim nositelyam rekomenduetsya izbegat upotrebleniya alkogolya poskolku on uvelichivaet risk cirroza i raka pecheni Virus gepatita B byl svyazan s razvitiem membranoznogo glomerulonefrita MGN Simptomy za predelami pecheni prisutstvuyut u 1 10 lyudej inficirovannyh VGV i vklyuchayut sindrom podobnyj syvorotochnoj bolezni ostryj nekroticheskij vaskulit uzelkovyj poliarteriit membranoznyj glomerulonefrit i papuleznyj akrodermatit v detskom vozraste sindrom Dzhanotti Krosti Sindrom podobnyj syvorotochnoj bolezni voznikaet pri ostrom gepatite B chasto predshestvuyushem poyavleniyu zheltuhi Klinicheskie priznaki lihoradka kozhnaya syp i poliarteriit Simptomy chasto prohodyat vskore posle nachala zheltuhi no mogut sohranyatsya na protyazhenii vsego perioda ostrogo gepatita B Okolo 30 50 lyudej s ostrym nekroticheskim vaskulitom uzelkovyj poliarteriit yavlyayutsya nositelyami HBV Nefropatiya svyazannaya s HBV opisana u vzroslyh no chashe vstrechaetsya u detej Membranoznyj glomerulonefrit naibolee rasprostranennaya forma Drugie immunooposredovannye gematologicheskie narusheniya takie kak essencialnaya smeshannaya krioglobulinemiya i aplasticheskaya anemiya byli opisany kak chast vnepechenochnyh proyavlenij infekcii HBV no ih svyaz ne tak chetko opredelena sledovatelno ih veroyatno ne sleduet schitat etiologicheski svyazannymi s HBV Pri pozdnih stadiyah hronicheskogo gepatita pri obshirnom fibroze i cirroze na pervyj plan vystupaet sindrom portalnoj gipertenzii otyagoshyonnyj hrupkostyu sosudov vsledstvie snizheniya sinteticheskoj funkcii pecheni Gemorragicheskij sindrom takzhe harakteren dlya fulminantnogo gepatita nachinaetsya s momenta popadaniya virusa v krov Posle popadaniya virusov v pechen cherez krov idyot skrytaya faza razmnozheniya i nakopleniya virusnyh chastic Pri dostizhenii opredelyonnoj koncentracii virusa v pecheni razvivaetsya ostryj gepatit B Inogda ostryj gepatit prohodit dlya cheloveka prakticheski nezametno i obnaruzhivaetsya sluchajno inogda protekaet v legkoj bezzheltushnoj forme proyavlyaetsya tolko nedomoganiem i snizheniem rabotosposobnosti Issledovateli polagayut chto bessimptomnoe techenie bezzheltushnaya forma i zheltushnyj gepatit sostavlyayut ravnye po kolichestvu porazhyonnyh lic gruppy To est vyyavlennye diagnostirovannye sluchai ostrogo gepatita B sostavlyayut tolko odnu tret vseh sluchaev ostrogo gepatita Po dannym drugih issledovatelej na odin zheltushnyj sluchaj ostrogo gepatita B prihoditsya ot 5 do 10 sluchaev zabolevanij kotorye kak pravilo ne popadayut v pole zreniya vrachej Mezhdu tem predstaviteli vseh tryoh grupp potencialno zarazny dlya okruzhayushih Ostryj gepatit libo postepenno shodit na net s eliminaciej virusa i ostavleniem stojkogo immuniteta funkciya pecheni vosstanavlivaetsya cherez neskolko mesyacev hotya ostatochnye yavleniya mogut soprovozhdat cheloveka vsyu zhizn libo perehodit v hronicheskuyu formu Hronicheskij gepatit B protekaet volnoobrazno s periodicheskimi inogda imeyushimi sezonnyj harakter obostreniyami V specialnoj literature etot process obychno opisyvayut kak fazu integracii i replikacii virusa Postepenno intensivnost zavisit kak ot virusa tak i immunnoj sistemy cheloveka gepatocity zamenyayutsya na kletki stromy razvivayutsya fibroz i cirroz pecheni Inogda sledstviem hronicheskoj HBV infekcii byvaet pervichnokletochnyj rak pecheni gepatocellyulyarnaya karcinoma Prisoedinenie virusa gepatita D k infekcionnomu processu rezko menyaet techenie gepatita i uvelichivaet risk razvitiya cirroza kak pravilo u takih bolnyh rak pecheni ne uspevaet razvitsya Stoit obratit vnimanie na sleduyushuyu zakonomernost chem menshe vozrast zabolevshego tem vyshe veroyatnost perehoda bolezni v hronicheskuyu stadiyu Naprimer bolee 95 vzroslyh lyudej zabolevshih ostrym gepatitom B vyzdoravlivayut a iz zabolevshih gepatitom B novorozhdennyh izbavyatsya ot virusa tolko 5 U zarazivshihsya detej v vozraste 1 6 let okolo 35 budut bolet gepatitom v hronicheskoj forme DiagnostikaV Rossii vrachi vseh specialnostej srednie medicinskie rabotniki lechebno profilakticheskih uchrezhdenij nezavisimo ot form sobstvennosti i vedomstvennoj prinadlezhnosti a takzhe detskih podrostkovyh i ozdorovitelnyh uchrezhdenij vyyavlyayut bolnyh ostrymi i hronicheskimi formami gepatita B nositelej VGV na osnovanii kliniko epidemiologicheskih i laboratornyh dannyh pri okazanii vseh vidov medicinskoj pomoshi Provoditsya serologicheskij skrining grupp lyudej s vysokim riskom zarazheniya Pri pervichnoj diagnostike osnovannoj na klinicheskih dannyh nevozmozhno otlichit gepatit B ot gepatita vyzyvaemogo drugimi virusnymi agentami potomu chrezvychajno vazhnym yavlyaetsya laboratornoe podtverzhdenie diagnoza Sushestvuet neskolko vidov analiza krovi dlya diagnostiki i monitoringa lyudej s gepatitom B Eti analizy mozhno ispolzovat dlya togo chtoby otlichit ostruyu i hronicheskuyu infekcii Okonchatelnyj diagnoz stavitsya posle laboratornyh issledovanij pokazateli funkcii pecheni priznaki citoliza vydelenie DNK virusa Diagnosticheskie markery HBV infekcii Dlya postanovki diagnoza sleduet vyyavlyat serologicheskie markery inficirovaniya virusom gepatita B HBsAg anti HBcIgM anti HBc anti HBs HBeAg anti HBe i DNK virusa HBV DNA Etiologicheskaya diagnostika HBV infekcii osnovana na vyyavlenii markyorov gepatita B v immunofermentnom metode IFA i polimeraznoj cepnoj reakcii PCR U lyudej bolnyh gepatitom B v krovi obnaruzhivaetsya HBsAg Esli zabolevanie nahoditsya v remissii v krovi nahodyat HbsAg i anti Hbc IgM Pri obostrenii zabolevaniya HBsAg anti HBc IgM anti HBc IgG Posle perenesyonnoj infekcii v krovi obnaruzhivayut anti HBs anti HBc IgG Posle vakcinacii v krovi ostayotsya tolko anti HBs Differencialnaya diagnostika Obychno virusnyj gepatit B ne predstavlyaet slozhnostej v pravilnoj diagnostike Slozhnosti voznikayut tolko pri super i koinfekciyah kogda slozhno vydelit aktivnyj na dannyj moment agent a takzhe pri nalichii neinfekcionnyh zabolevanij pecheni i zhelchevyvodyashih protokov LechenieOstryj gepatit B obychno ne trebuet lecheniya tak kak bolshinstvo vzroslyh spravlyayutsya s etoj infekciej spontanno Rannee protivovirusnoe lechenie mozhet potrebovatsya menee chem 1 zabolevshih pacientam s agressivnym razvitiem infekcii molnienosnyj gepatit i licam s oslablennym immunitetom S drugoj storony lechenie hronicheskoj infekcii mozhet byt poleznym dlya umensheniya riska cirroza i raka pecheni Hronicheski inficirovannye lica s postoyanno povyshennym urovnem alaninaminotransferazy markera povrezhdeniya pecheni i bolshim kolichestvom DNK HBV yavlyayutsya predpochtitelnymi kandidatami dlya terapii Hotya ni odin iz imeyushihsya preparatov ne sposoben polnostyu ochistit organizm pacienta ot virusa gepatita B oni mogut ostanovit razmnozhenie virusa tem samym svodya k minimumu povrezhdenie pecheni Lechenie sushestvuyushimi preparatami mozhet imet konechnuyu dlitelnost v raschyote na dostizhenie bezmedikamentoznoj remissii no chashe nosit harakter mnogoletnej podderzhivayushej terapii Po sostoyaniyu na 2016 god sushestvuet vosem preparatov licenzirovannyh dlya lecheniya infekcionnogo gepatita B v Soedinennyh Shtatah K nim otnosyatsya protivovirusnye preparaty pryamogo dejstviya PPPD nukleozidnye ingibitory obratnoj transkriptazy lamivudin Epivir Tyzeka Baraclude nukleotidnye ingibitory obratnoj transkriptazy adefovir Hepsera tenofovira dizoproksil fumarat Viread tenofovira alafenamid fumarat Vemlidy immunomodulyatory pegilirovannyj interferon alfa 2a Pegasys Nukleozidy lamivudin telbivudin i nukleotid adefovir moralno ustareli i ne rekomenduyutsya vvidu nizkogo poroga rezistentnosti i vozmozhnosti formirovaniya perekryostnoj rezistentnosti virusa k entekaviru i preparatam tenofovira sootvetstvenno Vsemirnaya organizaciya zdravoohraneniya rekomendovala v kachestve terapii pervoj linii entekavir libo tenofovir Priyom entekavira protivopokazan pri beremennosti nefrotoksichnyj i toksichnyj dlya kostej TDF zhelatelno po vozmozhnosti zamenit na TAF Pacienty s cirrozom v naibolshej stepeni nuzhdayutsya v lechenii Lechenie preparatami pryamogo dejstviya imeet umerennyj uroven pobochnyh effektov no simptomaticheskoe vyrazhaetsya v podavlenii virusnoj nagruzki ono prakticheski nikogda ne vedyot k serokonversii virusa V otlichie ot terapii preparatami pryamogo dejstviya interferonoterapiya imeet vysokij uroven pobochnyh effektov odnako vygodno otlichaetsya ot terapii PPPD tem chto chashe privodit k serokonversii HBeAg markyora replikacii virusa Otvet na lechenie interferonami zavisit ot neskolkih faktorov Nekotorye pacienty imeyut gorazdo bolshe shansov otvetit na terapiyu po sravneniyu s ostalnymi Prichina mozhet byt v genotipe virusa kotorym zarazhyon chelovek a takzhe v geneticheskih osobennostyah samogo pacienta Lechenie snizhaet replikaciyu virusa v pecheni tem samym snizhaya virusnuyu nagruzku kolichestvo virusnyh chastic v krovi Serokonversiya HBeAg pri interferonoterapii nablyudaetsya u 37 pacientov porazhyonnyh HBV genotipa A no vsego lish u 6 pacientov zarazhyonnyh virusom HBV genotipa D Genotip HBV B imeet analogichnye tipu A pokazateli serokonversii HBeAg V sluchae HBV genotipa C serokonversiya nablyudaetsya tolko v 15 sluchaev Ustojchivoe snizhenie kolichestva HBeAg posle lecheniya sostavlyaet 45 pacientov dlya tipov A i V 25 30 pacientov dlya tipov C i D Primenenie interferona trebuyushego inekcij ezhednevno ili tri raza v nedelyu bylo vytesneno pegilirovannym interferonom preparatom dlitelnogo dejstviya inekcii kotorogo provodyatsya tolko odin raz v nedelyu ProfilaktikaVakcinaciya Osnovnaya statya Vakcina protiv gepatita B Vakcinaciya protiv gepatita B yavlyaetsya universalnym sposobom zashity dlya vseh putej zarazheniya Vakciny dlya profilaktiki gepatita B v Soedinyonnyh Shtatah shiroko rekomenduyutsya dlya mladencev s 1991 goda Pervaya doza obychno rekomenduetsya v techenie pervyh sutok posle rozhdeniya Bolshinstvo vakcin primenyaetsya v tryoh dozah v techenie neskolkih mesyacev Zashitnyj otvet na vakcinu opredelyayut kak koncentraciyu antitel protiv HBs po menshej mere 10 mME ml v syvorotke krovi Vakcina bolee effektivna u detej 95 vakcinirovannyh imeyut zashitnye urovni antitel Ih uroven snizhaetsya primerno do 90 v vozraste 40 let i primerno do 75 u lic starshe 60 let Zashita obespechivaemaya vakcinaciej dlitsya dazhe posle togo kak urovni antitel opuskayutsya nizhe 10 mME ml Vse kto podverzhen vozdejstviyu zhidkostej organizma takih kak krov dolzhny byt vakcinirovany Rekomenduetsya provodit testirovanie dlya proverki effektivnoj immunizacii a dopolnitelnye dozy vakciny predostavlyayutsya tem kto nedostatochno immunizirovan V issledovaniyah kotorye prodolzhalis ot 10 do 22 let ne bylo sluchaev gepatita B sredi vakcinirovannyh lic s normalnoj immunnoj sistemoj Zaregistrirovany tolko redkie hronicheskie infekcii Vakcinaciya osobenno rekomenduetsya dlya grupp vysokogo riska vklyuchaya rabotnikov zdravoohraneniya lyudej s hronicheskoj pochechnoj nedostatochnostyu i muzhchin imeyushih polovye kontakty s muzhchinami Rukovodyashie ukazaniya v Velikobritanii glasyat chto pervonachalno otvetivshie na privivku lica poluchivshie immunitet blagodarya privivkam nuzhdayutsya v dalnejshej zashite eto kasaetsya lyudej nahodyashihsya v zone riska zarazheniem gepatitom B Im rekomenduetsya dlya sohraneniya immuniteta k virusu gepatita B povtornaya revakcinaciya raz v pyat let Vakcinaciya pri zarazhenii V sluchae zarazheniya v period pervyh 1 2 h nedel dlya predotvrasheniya zabolevaniya neobhodimo provedenie ekstrennoj profilaktiki s pomoshyu vakcinacii po sheme 0 1 2 12 i vvedeniya immunoglobulina Profilaktika polovogo puti peredachi Bezopasnyj seks vklyuchaya svedenie k minimumu chisla partnyorov i ispolzovanie barernyh metodov prezervativov zashishayut ot peredachi infekcii Profilaktika vertikalnogo puti peredachi Profilaktika vertikalnoj peredachi virusa gepatita B ot inficirovannoj materi k rebyonku neposredstvenno vo vremya beremennosti rekomendovana po krajnej mere zhenshinam s vysokoj virusnoj nagruzkoj i ili vysokim urovnem HBsAg nachinaya s 24 28 j nedel beremennosti i do 12 nedel posle rodov Dlya teh novorozhdennyh chi materi inficirovany HBsAg tolko odna vakcina protiv gepatita B tolko immunoglobulin gepatita B ili kombinaciya vakciny plyus immunoglobulin protiv gepatita B Eti mery predotvrashayut peredachu HBV vo vremya rodov v 86 99 sluchaev Dlya profilaktiki ispolzuetsya isklyuchitelno istochnik ne ukazan 2059 dnej tenofovir esli beremennaya zhenshina uzhe prinimaet preparaty pryamogo protivovirusnogo dejstviya PPPD otlichnye ot tenofovira to ej sleduet perejti na priyom tenofovira Nalichie aktivnogo virusnogo gepatita ne yavlyaetsya protivopokazaniem dlya kormleniya grudyu nezavisimo ot togo nahoditsya kormyashaya grudyu zhenshina na protivovirusnoj terapii ili net poskolku eto ne vliyaet na risk peredachi gepatita B rebyonku Tenofovir naznachennyj vo vtorom ili tretem trimestre mozhet snizit risk peredachi ot materi k rebyonku na 77 v sochetanii s immunoglobulinom gepatita B i vakcinoj protiv gepatita B osobenno dlya beremennyh zhenshin s vysokim urovnem DNK virusa gepatita B Odnako net dostatochnyh dokazatelstv togo chto vvedenie odnogo lish immunoglobulina gepatita B vo vremya beremennosti mozhet snizit veroyatnost peredachi virusa novorozhdennomu Profilaktika parenteralnogo puti peredachi Pri invazivnyh procedurah obyazatelno organizovat ispolzovanie perchatok bezopasnoe obrashenie i udalenie ostryh predmetov i othodov bezopasnuyu ochistku oborudovaniya i instrumentov testirovanie donorskoj krovi podgotovku medicinskogo personala predotvrashenie povtornogo ispolzovaniya shpricev i prochih odnorazovyh predmetov prinimat mery dlya umensheniya chastoty travm ot kolyushih i rezhushih instrumentov u medicinskih rabotnikov Na gosudarstvennom urovne VOZ rekomenduet rabotu s licami upotreblyayushimi vnutrivennye narkotiki programmy vydachi igl i shpricev programmy razdachi prezervativov dlya lyudej upotreblyayushih inekcionnye narkotiki i ih seksualnyh partnyorov vakcinaciyu diagnostiku i lechenie virusnogo gepatita net v istochnike Profilaktika parenteralnogo puti peredachi v bytu V seme ili v organizovannom kollektive 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