Zdravila s farmakološkim učinkom na srcu

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Zdravila s farmakološkim učinkom na srcu Prof. dr. Mojca Kržan Inštitut za farmakologijo in eksperimentalno toksikologijo, Medicinska fakulteta, Univerza v Ljubljani

Zdravila s farmakološkim učinkom na srcu vpliv na porabo kisika in metabolizem vpliv na krčenje vpliv na prevajanje

Ishemična bolezen srca Stabilna angina pektoris Nestabilna angina pektoris Prinz-Metalova angina

Zdravila, za zdravljenje ishemične bolezni srca Zaviralci adrenergičnih receptorjev β Organski nitrati Zaviralci kalcijevih kanalov

Zaviralci adrenergičnih receptorjev β β-blockers continue to surprise us (Cruckshank, 2000)

Generacije zaviralcev adrenergičnih 1. generacija: neselektivni propranolol receptorjev β 2. generacija: selektivni za receptorje β1 atenolol, metoprolol, acebutolol, bisoprolol 3. Generacija: + vazodilatatorji β2 intrinzična simpatikomimetična aktivnost pindolol α1-adrenergična blokada labetalol, karvedilol Sproščanje NO: nebivolol

Neželeni učinki Spazem gladke mišice: bronhospazem, mrzle ekstremitete Pretirani učinki na srce: bradikardija, bloki prevajanja, pretiran negativni inotropni učinek Prehajnje skozi krvnomožgansko pregrado: nespečnost, depresija

Pozor Zaviralci adrenergičnih receptorjev β Regulatorno zvečanje števila receptorjev Postopna prekinitev zdravljenja

Organski nitrati As is often true in matters of the heart, absence (nitrate-free intervals) makes the heart grow fonder (more nitrate responsiveness) (Opie, 1991)

Organski nitrati Nitroglicerin Isosorbid dinitrat Pentaeritritol tetranitrat Eritritil tetranitrat

Neželeni učinki glavobol hipotenzija bradikardija / tahikardija methemoglobinemija rezistenca na heparin toleranca

Toleranca ob jemanju organskih nitratov Neznan mehanizem Kako rešujemo: 12 ur na dan brez organskih nitratov

Zaviralci kalcijevih kanalov

Zaviralci kalcijevih kanalov Verapamil, diltiazem Dihidropiridinski: nikardipin, nifedipin, amlodipin, felodipin, isradipin, nitrendipin, nisoldipin

Neželeni učinki Vsi glavobol, edemi, naval krvi v glavo, omotičnost, možna srčna odpoved Verapamil konstipacija

Povzetek

Farmakološko zdravljenje srčnega popuščanja

Akutno popuščanje srca Kronično popuščanje srca

Cilji zdravljenja srčnega popuščanja Olajšanje simptomov Upočasnitev bolezni Izboljšanje preživetja

Zdravila z akutnim inotropnim učinkom simpatikomimetiki in druga zdravila Dobutamin β1 >β2 > α Dopamin β1 (β2), α, D1, D2 Adrenalin β1 > α > β2 Noradrenalin β1 = β2 > α Levosimendan

1. Hemodinamske spremembe simptomi 2. Nevrohumoralna aktivacija 3. Remodeliranje prekata Napredovanje bolezni

Zdravljenje kroničnega srčnega popuščanja ACE inhibitorji Zaviralci adrenergičnih receptorjev β Diuretiki Inotropna zdravila Neposredni vazodilatatorji Antagonisti aldosterona

Učinki zdravljenja kroničnega srčnega popuščanja Zmanjšanje obremenitve miokarda Zmanjšanje volumna zunajcelične tekočine Izboljšana kontraktilnost srca Upočasnitev preoblikovanja/remodeliranja

Zaviralci ACE The benefits of ACEI exceed our expectations. (Francis, 2000)

Generacije inhibitorjev ACE razred I kaptopril razred II prozdravila benazepril, enalapril, fosinopril, kvinapril razred III vodotopni lisinopril

Mehanizem delovanja ACE inhibitorjev

Neželeni učinki inhibitorjev ACE Kašelj Ortostatska hipotenzija Reverzibilna ledvična odpoved Angioedem Hiperkaliemija Embriopatije Nevtropenija /agranulocitoza (visoki odmerki) Izguba okusa

Antagonisti receptorjev za angiotenzin- II primeri: losartan, irbesartan, telmisartan, valsartan Prednosti: ni učinkov, ki jih posreduje bradikinin (npr. kašelj), padec holesterola v serumu Pomanjkljivosti: ni vazodilatacije v ledvicah, ni zaščite endotelija.

Digoksin Digitalis is effective, but is it safe? Marcus 1993

Kardiotonični glikozidi mehanizem delovanja

Farmakokinetika digoksina Absorpcija 75% Inaktivacija prek bakterij v GITu Terepevtska konc. 1-2 ng/ml, zdaj 0.5 1.5 ng/ml Veže se na receptorje v srcu in skeletni mišici Prehaja v CŽS Večina se ga izloči nespremenjenega z urinom, 30% prek jeter Kronična odpoved ledvic manjši Vd Izguba telesne mase manjša vezava na skeletne mišice

Stanja, ki vplivajo na delovanje digoksina Povečajo Hipokaliemija Hipomagneziemija Hiperkalcemija Hipoksemija hipotiroidizem Zmanjšajo Hiperkaliemija Hipokalcemija Hipertiroidizem

Neželeni učinki digitalisa GIT: anoreksija, navzeja, bruhanje, diareja CŽS: utrujenost, zmedenost, bolečine po obrazu, nespečnost, vertigo, motnje vida Srce: palpitacije, aritmije, sinkopa

Povzetek