Globálny slovník portálu IMED

Pojem: 
Extrakraniální radioterapie a radiochirurgie
Definícia: 

Extrakraniální stereotaktická radioterapie/radiochirurgie (SBRT – stereotactic body radiotherapy) využívá velmi přesné aplikace vysoké jednotlivé dávky záření v malém počtu frakcí. Díky stále lepší vybavenosti radioterapeutických pracovišť z hlediska možností obrazové navigace a fixace pacientů lze stereotaktický přístup využít prakticky ve všech anatomických lokalitách. S výhodou nalézá uplatnění zvláště při léčbě nádorových ložisek v plících, játrech, dutině břišní či pánvi a ve skeletu.

Kľúčové slovo: 
Radiochirurgie
Pojem: 
syndróm nedostatku testosterónu - TDS
Definícia: 

<div>TDS (testosterone deficiency syndrome) je definovan&yacute; ako klinick&yacute; a biochemick&yacute; syndr&oacute;m, ku ktor&eacute;mu doch&aacute;dza v procese starnutia mužov. Nedostatok testoster&oacute;nu u postihnut&yacute;ch mužov nepriaznivo vpl&yacute;va na funkcie viacer&yacute;ch org&aacute;nov&yacute;ch syst&eacute;mov. Vedie k podstatn&eacute;mu zhor&scaron;eniu kvality života. U mužov medzi 40 - 70 rokmi kles&aacute; biologicky akt&iacute;vny testoster&oacute;n v s&eacute;re približne o 1,2 % ročne.</div>

Pojem: 
Spolupráca endokrinológa a oftalmológa pri endokrinnej orbitopatii
Definícia: 

Práca sa venuje návodu, ako by mala vyzerať spolupráca oftalmológa s endokrinológom a zbytočným chybám, ku ktorým často zbytočne dochádza.

Kľúčové slovo: 
hrúbka extraokulárnych svalov
vnútroočný tlak
epidemiologické faktory
Endokrinná orbitopatia
farebná dopplerovská ultrasonografia
Pojem: 
Epithelial-mesenchymal transition (EMT) – epiteliálno-mezenchymálny prechod
Definícia: 

<p>
<pre>je fyziologick&yacute; proces prebiehaj&uacute;ci v embryogen&eacute;ze a pri hojen&iacute; r&aacute;n. Prejavuje sa aj v patologick&yacute;ch procesoch tumorigen&eacute;zy, ako s&uacute; inici&aacute;cia
a progresia n&aacute;dorov. Z&aacute;kladnou vlastnosťou EMT je strata epitelovej morfol&oacute;gie bunky a z&iacute;skanie vlastnost&iacute;, ktor&eacute; s&uacute; podobn&eacute; fibroblastom. Je
to sp&ocirc;soben&eacute; najm&auml; zn&iacute;ženou expresiou E-kadher&iacute;nu v d&ocirc;sledku aktiv&aacute;cie transkripčn&eacute;ho komplexu TCF/LEF s b-katen&iacute;nom, ako aj transkripčn&yacute;ch
faktorov Twist, Snai1, ZEB, ktor&yacute;ch aktivita koreluje s fenotypom kmeňov&yacute;ch buniek.</pre>
</p>

Kľúčové slovo: 
iniciácia a progresia nádorov
Pojem: 
Nasýtené mastné kyseliny (NMK)
Definícia: 

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<p class=\"MsoNormal\"><strong><span style=\"font-size: 12pt; line-height: 115%; font-family: &quot;Times New Roman&quot;,&quot;serif&quot;;\"><span></span></span></strong><span style=\"font-size: 12pt; line-height: 115%; font-family: &quot;Times New Roman&quot;,&quot;serif&quot;;\">maj&uacute; druh&yacute; najvy&scaron;&scaron;&iacute; aterog&eacute;nny potenci&aacute;l. NMK nie s&uacute; len v&nbsp;živoč&iacute;&scaron;nych tukoch (maslo 62 %, bravčov&aacute; masť 40 %), ale aj v&nbsp;niektor&yacute;ch rastlinn&yacute;ch tukoch (kokosov&yacute; a&nbsp;palmov&yacute; olej). Zatiaľ st&aacute;le ch&yacute;ba legislat&iacute;va určuj&uacute;ca povinnosť v&yacute;robcu jasne deklarovať množstvo TFMK a&nbsp;NMK v&nbsp;potravin&aacute;ch.</span></p>

Kľúčové slovo: 
aterogénny potenciál
Pojem: 
CYKLOSPORÍN A (CsA)
Definícia: 

<p>
&nbsp;</p>
<p>
je veľmi &uacute;činn&eacute; imunosupres&iacute;vum, ktor&eacute; umožnilo veľk&yacute; rozmach transplant&aacute;ci&iacute;; od začiatku jeho už&iacute;vania v klinickej praxi (prv&eacute; použitie v Cambridge r. 1978) hovor&iacute;me o <strong>cyklospor&iacute;novej &eacute;re</strong><em>. </em>Na rozdiel od in&yacute;ch imunosupres&iacute;v, CsA neinterferuje so synt&eacute;zou ani nukleov&yacute;ch kysel&iacute;n ani prote&iacute;nov. V cytoplazme buniek, z ktor&yacute;ch najcitlivej&scaron;ie s&uacute; T-lymfocyty, sa viaže sa na svoj &scaron;pecifick&yacute; v&auml;zbov&yacute; prote&iacute;n - cyklofil&iacute;n A, s ktor&yacute;m vytv&aacute;ra komplex, ktor&yacute; inhibuje <strong>kalcineur&iacute;n</strong>. Je to fosfat&aacute;za, ktor&aacute; tvor&iacute; s&uacute;časť fosforylačnej a defosforylačnej kask&aacute;dy aktiv&aacute;cie, resp. inhib&iacute;cie mnoh&yacute;ch prote&iacute;nov, o. i. aj &scaron;pecifick&eacute;ho transkripčn&eacute;ho faktora aktivovan&yacute;ch T-lymfocytov - NFAT, ktor&yacute; zodpoved&aacute; za aktiv&aacute;ciu g&eacute;nu pre IL-2. NFAT sa kon&scaron;titut&iacute;vne nach&aacute;dza v cytoplazme a po jeho defosforyl&aacute;cii sa pres&uacute;va do jadra bunky, kde sa viaže na svoju &scaron;pecifick&uacute; oblasť prom&oacute;torov&eacute;ho &uacute;seku g&eacute;nu pre IL-2, č&iacute;m umožn&iacute; jeho transkripciu. <strong>CsA v&auml;zbou na kalcineur&iacute;n blokuje defosforyl&aacute;ciu NF-AT</strong>, v&yacute;sledkom čoho je inhib&iacute;cia synt&eacute;zy IL-2 a t&yacute;m aj aktiv&aacute;cie T-lymfocytov. Podobne CsA inhibuje transkripciu aj nukleov&eacute;ho faktora kB (NF-kB), JUN-termin&aacute;lnej kin&aacute;zy (JNK) a ďal&scaron;&iacute;ch g&eacute;nov, ktor&eacute; sa z&uacute;častňuj&uacute; na včasnej f&aacute;ze aktiv&aacute;cie T-lymfocytov, ako s&uacute; g&eacute;ny <em>c-myc</em>, g&eacute;ny pre IFN-g, IL-3, IL-4 a IL-5, IL-2R. Naopak, CsA zvy&scaron;uje transkripciu TGF-b1, čo s&iacute;ce prispieva k jeho celkovej imunosupres&iacute;vnej aktivite, ale s&uacute;časne aj k jeho nepriazniv&yacute;m &uacute;činkom, najm&auml; ren&aacute;lnej fibr&oacute;ze.&nbsp;</p>

Kľúčové slovo: 
imunosupresívum
Pojem: 
SIROLIMUS (Rapamycín)
Definícia: 

<p>
&nbsp;</p>
<p>
a jeho hydrofiln&yacute; anal&oacute;g <strong>EVEROLIMUS (Certican)</strong>,&nbsp;&nbsp;sa podobne ako cyklospor&iacute;n A (CsA) a&nbsp;takrolimus (FK505), viažu v&nbsp;cytoplazme terčovej bunky na ten ist&yacute; cyklofil&iacute;n, av&scaron;ak ich p&ocirc;sobenie je odli&scaron;n&eacute;. Sirolimus či everolimus totiž neinhibuj&uacute; synt&eacute;zu IL-2, ale potl&aacute;čaj&uacute; prolifer&aacute;ciu buniek, ktor&uacute; indukuje IL-2. Mechanizmus &uacute;činku spoč&iacute;va v z&aacute;sahu do bunkov&eacute;ho delenia - inhibuj&uacute; synt&eacute;zu aktivitu viacer&yacute;ch kin&aacute;z z&aacute;visl&yacute;ch od cykl&iacute;nu, predov&scaron;etk&yacute;m mTOR (<strong><em>m</em></strong><em>ammalian <strong>t</strong>arget <strong>o</strong>f <strong>r</strong>apamycin</em>), čo sp&ocirc;sob&iacute; redukciu synt&eacute;zy prote&iacute;nov bunkov&eacute;ho cyklu. V&yacute;sledkom je, že bunka sa prest&aacute;va deliť, d&ocirc;jde k zastaveniu bunkov&eacute;ho delenia v neskorej G1-f&aacute;ze, č&iacute;m zabraňuje jej prechodu do S-f&aacute;zy. Sirolimus (everolimus) navy&scaron;e sp&ocirc;sobuje, že efektorov&eacute; cytotoxick&eacute; T-lymfocyty (CTL) sa pres&uacute;vaj&uacute; z perif&eacute;rnej krvi do sekund&aacute;rnych lymfoidn&yacute;ch org&aacute;nov, kde sa sekvestruj&uacute;, č&iacute;m sa zabr&aacute;ni de&scaron;trukcii terčov&yacute;ch buniek v perif&eacute;rnych tkaniv&aacute;ch. Navy&scaron;e, efektorov&eacute; CTL m&ocirc;žu v sekund&aacute;rnych lymfoidn&yacute;ch org&aacute;noch ničiť aj tu sa nach&aacute;dzaj&uacute;ce antig&eacute;nmi aktivovan&eacute; bunky prezentuj&uacute;ce antig&eacute;n, čo m&ocirc;že prispieť k jeho celkov&eacute;mu imunosupres&iacute;vnemu &uacute;činku oboch imunosupres&iacute;v.</p>

Kľúčové slovo: 
SIROLIMUS (Rapamycín)
Pojem: 
genetická mutácia
Definícia: 

<p>
zmeny v niektor&yacute;ch g&eacute;noch, ktor&yacute; zvy&scaron;uj&uacute; riziko n&aacute;dorov</p>

Kľúčové slovo: 
mutácia
Pojem: 
depresivní porucha
Definícia: 

<p>
Deprese je stav psychiky projevuj&iacute;c&iacute; se dlouhodobě (min 14 dn&iacute;) poklesl&yacute;mi n&aacute;ladami jedince, ztr&aacute;tou radosti a potě&scaron;en&iacute; ze z&aacute;jmů a poklesem energie. &nbsp;Dotyčn&yacute; pociťuje často d&aacute;le &uacute;zkost a osamocenost, pocity bezcennosti nebo viny, malou sebedůvěru, &uacute;navu, zhor&scaron;en&eacute; soustředěn&iacute; a m&aacute; probl&eacute;my s pozornost&iacute;.&nbsp;</p>

Kľúčové slovo: 
afektivní porucha
Pojem: 
ľudská echinokokóza
Definícia: 

<p style=\"text-align: justify;\">
Ľudsk&aacute; echinokok&oacute;za je parazit&aacute;rne ochorenie, prenosn&eacute; na človeka zo zvierat. Neliečen&aacute; alveokok&oacute;za konč&iacute; smrteľne.&nbsp;</p>

Kľúčové slovo: 
alveokokóza
Pojem: 
Termografia
Definícia: 

<p>
Termografia je zviditelnenie infračerven&eacute;ho žiarenia z povrchu v&scaron;etk&yacute;ch telies, teda aj ľudsk&eacute;ho organizmu.</p>

Pojem: 
Chromozomální aberace
Definícia: 

<p>
Vrozen&eacute; nebo z&iacute;skan&eacute; odchylky karyotypu. Chromozm&aacute;ln&iacute; aberace mohou postihovat strukturu chromozomu (strukturn&iacute; chromozom&aacute;ln&iacute; aberace) nebo počet chromozomů v&nbsp;buňce (numerick&eacute; chromozom&aacute;ln&iacute; aberace, aneuploidie).</p>

Kľúčové slovo: 
karyotyp
Pojem: 
Zdravý pošvový ekosystém
Definícia: 

<p>
predstavuje prostredie s&nbsp;dynamick&yacute;mi vzťahmi medzi endog&eacute;nnou mikrofl&oacute;rou a&nbsp;jej metabolick&yacute;mi produktami, metabolick&yacute;mi produktami hostiteľa, hladinou estrog&eacute;nu a&nbsp;hodnotou pH.&nbsp;</p>

Pojem: 
Vývojové poruchy řeči
Definícia: 

<p>
&nbsp;</p>
<p>
<strong>V&yacute;vojov&aacute; porucha řeči</strong> je porucha z&iacute;sk&aacute;v&aacute;n&iacute;, osvojov&aacute;n&iacute; si norm&aacute;ln&iacute; komunikačn&iacute; schopnosti adekv&aacute;tně věku, při adekv&aacute;tn&iacute;m perifern&iacute;m sluchu, inteligenci a absenci hrub&eacute;ho senzori-motorick&eacute;ho deficitu nebo kongenit&aacute;ln&iacute; malformace řečov&eacute;ho a hlasov&eacute;ho &uacute;stroj&iacute;. Hledaj&iacute; se souvislosti mezi vadnou řečovou produkc&iacute; a abnorm&aacute;ln&iacute; řečovou percepc&iacute;.</p>
<p>
&nbsp;</p>

Pojem: 
GIST
Definícia: 

<p>
- gastrointestin&aacute;lny strom&aacute;lny syndr&oacute;m</p>

Kľúčové slovo: 
GIST

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