K16 Farmakologi Obat Simpatis
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Transcript of K16 Farmakologi Obat Simpatis
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SIMPATOMIMETIKASIMPATOLITIKJazanul Anwar_Hasanul ArifinDepartemen Farmakologi & Terapeutik Fakultas Kedokteran USU2009
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SIMPATOMIMETIKA
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syaraf pasca ganglionneurotransmitersintesapenimbunanpenglepasanperombakanreseptorperangsanganperangsanganSimpatomimetikaperangsangan
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TYROSINE _METYLDOPA_> NA ___ NAAdrenalin COMTMAO
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Adrenergik dan Penghambat AdrenergikNENENEDDDDDreseptorSimpatomimetik yang bekerja langsung/NENENENENEDDreseptorNENENEDNEDDreseptorABCSimpatomimetik yang bekerja tidak langsungSimpatomimetik yang bekerja campuranD : obat simpatomimetikE/NEamfetamine
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Simpatomimetika langsungSimpatomimetika tak langsung
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SIMPATOMIMETIKA (KIMIAWI)Endogen:adrenalinnoradrenalindopaminNonendogen:
1-adrenergik : phenylephrine, methoxamin 2-adrenergik : clonidine, oxymetazoline-adrenergik : adrenalin -adrenergik : isoprenaline1-adrenergik : dobutamine2-adrenergik : terbutaline, procaterolDopamin (D) : dopaminD1 : fenoldopamD2 : bromocriptinCATECHOLAMINENONCATECHOLAMINE : amfetamin, metamfetamin
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1 Agonists
MethoxaminePenylpropranolaminePhenylephrineMephentermineMetaraminolMitodrine
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1 Agonists Response utama & kegunaan klinikMethoxamine: i.v. hipotensi es paroxysmal takhikardiPhenylephrine: | vasokonstriksi nasal decongestantPhenylpropranolamine: vasokonstriksi nasaldecongestantMephentermine: direk & indirek, i.m. MetaraminolMitodrineResistens vaskuler perifer naik
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1 AgonistsKontraindikasiHypertension Ischemic organ diseasesPembesaran Prostrat Pemberian bersama dg obat-obat jg menambah kadar NAMAO inhibitorssympathomimetika tak langsung
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2 AgonistsPrototypeClonidineBrimonidine
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2 Agonists Response utama & tempat kerjaResponseVasodilatasiProduksi cairan mata berkurangTempat kerjaPeripheralPrejunctional: mengurangi penglepasan NASome postjunctional sites (eye, pancreas, platelets)
SSP: mengurangi sympathetic outflow
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2 Agonists Kegunaan klinikAntihypertensives
Menurunkan tekanan intraocular glaucoma sudut terbuka
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2 AgonistsCara pemberianOral
Transdermal
Topical (to eye)
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2 AgonistsEfek sampingBradycardia(kelambatan denyut jantung)SSP (50% of population) sedasi mulut keringDisfungsi Sexual
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1 AgonistsPrototype Dobutamine
Response utama - KardiostimulasiKegunaan klinikGagal jantungShock CardiogenicEfek tak diinginkanArrythmias(variasi irama normal denyut jantung, meliputi kelainan frekuensi,regularitas,lokasi asal impuls)
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2 AgonistsPrototypesAlbuterolSalbutamolSalmeterolRitodrine
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2 Agonists ResponsesBronchodilationAlbuterolSalbutamolSalmeterol Terbutalin
Uterine dilationRitodrine
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2 AgonistsClinical usesBronchodilatasiAsthmaCOPD
Tocolytic agents Late term gestation
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2 AgonistsEfek tak diinginkanSymptoms stimulasi 1 TachycardiaWidening pulse pressure (systolic pressure rise)Symptoms of 2 stimulationWidening pulse pressure (diastolic pressure drop)Drop in serum K+ (skeletal muscle uptake)Skeletal muscle tremor
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2 AgonistsAdverse Effects (Cont.)CNSAnxietyRestlessnessApprehension
Tolerance to bronchodilationWithout tolerance to adverse effect such as tachycardia.
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2 AgonistsContraindicationsCardiac diseaseCoronary artery diseaseArrhythmiasDiabetesHyperthyroidismCo-administration MAO inhibitorsIndirect-acting sympathomimetics
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Obat-obat adrenergik /simpatomimetik
AdrenergikReseptorPemakaian dalam klinikEpinefrin (Adrenalin)1, 1, 2Anafilaktik syok, asma akut, henti jantungEfedrin1, 1, 2Hipotensi, bronkospasme, kongesti hidungNE 1, 1Syok vasokonstriktor kuatPseudoefedrin1, 1DekongestanFenilefrin1DekongestanFenilpropanolamin (PPA)1, 1DekongestanDopamin1HipotensiIsoproterenol1, 2Payah jantung kongestif aliran darah miokardium dan curah jantungMetaproterenol1, 2Bronkospasme, blok jantung akutAlbuterol2BronkospasmeTerbutalin2Relaksasi uterus
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SIMPATOLITIKA
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syaraf pasca ganglionneurotransmitersintesapenimbunanpenglepasanperombakanreseptorperangsanganpenghambatan perangsanganpenghambatanSimpatomimetikaSimpatolitikaperangsanganpenghambatanpenghambatan penghambatanpenghambatan
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PENGHAMBAT SINTESABlokade penimbunanBLOKADE PENGLEPASANBLOKADE RESEPTOR
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NT inhibition On presynaptic endingDrug affecting NT synthesisDrug affecting NT storageDrug affecting NT release
On postsynaptic endingDrug affecting parasympathetic receptorsDrug affecting sympathetic receptors
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SIMPATOLITIKAPRASINAPSPASCASINAPSPENGHAMBAT SINTESA-METHYL DOPABLOKADE PENIMBUNANRESERPINEPENGHAMBAT PENGLEPASAN NAGUANETHIDINEBLOKADE RESEPTOR BLOKADE RESEPTOR
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BLOKADE PENYIMPANAN NA RESERPINE (RAUWOLFIA SERPENTINE)KEGUNAAN KLINIK: HIPERTENSIEFEK SAMPING: ssp- DEPRESI SEDASI PERIFERI NASAL CONGESTIPENGHAMBAT PENGLEPASAN NAGUANETHIDINE
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Selectivity of AntagonistsSelective antagonistsNonselective (1/2) antagonistsSelective 1 antagonistsUroselective 1A antagonistsSelective antagonistsNonselective (2) antagonistsSelective 1 antagonists
Nonselective adrenergic ( antagonists
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Nonselective AntagonistsClinical Uses: LimitedPheochromocytomaBenign prostatic obstruction(Phenoxybenzamine)Autonomic hyperreflexiaAdverse EffectsMigraine headache(Ergot alkaloids)CardiovascularTachycardia (reflex)Orthostatic hypotentionNasal congestionNon cardiovascularGI (Phentolamine)Impotence (Phenoxybenzamine)Potential mutagen (Phenoxybenzamine)
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Selective 1 AntagonistsAdvantage over non-selective agentslack 2 componentless prejunctional control (less reflex tachycardia)
less CNS component of actionUses HypertensionCongestive heart failureBenign prostatic hyperplasiaPrazosin (BID dosage)Doxazosin &Terazosin (QD dosage)Pheochromocytoma
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Selective 1 AntagonistsAdverse EffectsOrthostatic hypotensionUsually becomes toleratedGive first dose at nightNasal congestion
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Uroselective 1A AntagonistTamsulosinQD dosageClinical UseBenign Prostatic HyperplasiaAdverse EffectsRetrograde ejaculationNOTE: Avoids orthostatic hypotension in most
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Selective 2 AntagonistsYohimbineApparent Mechanism of Actionmajor mechanism of action appears to be increasing sympathetic outflow from CNSClinical Uses - (limited):ImpotencyDiabetic neuropathy painOrthostatic hypotension
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AntagonistsIn hypertensive (hyperkinetic heart-induced)Decrease blood pressureIn heart failureDecrease heart work & protect against arrythmiasAsthma or other bronchospasmcause bronchoconstrictionDiabetesmask symptoms of insulin-induced hypoglycemiaaugment insulin-induced hypoglycemia
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AntagonistsPrototype - PropranololPure antagonist, no Intrinsic Sympathomimetic Activity(ISA) (i.e. not a partial agonist)
Nonselective to subtypes
High lipid solubility - Enters gut & CNS
High first pass metabolism - causing low bioavailability
Has membrane-stabilizing activityQuinidine-like effects, Na+ channel blockade, (local anesthetic)
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AntagonistsNonselectivePropranolol
Nadolol: long half-life
Timolol: use in glaucoma
Pindolol: ISA
Selective1 Metoprolol
Atenolol: limited entry
Esmolol: short half-life
Acebutolol: ISA
Bisoprolol
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Uses of AntagonistsCardiovascularHypertensionAnginaArrhythmiasMyocardial infarctionHeart failureCV Symptoms ofHyperthyroidism PheochromocytomaAortic aneurysmMigraine headacheNon-cardiovascularGlaucoma
Somatic symptoms of anxiety (e.g. stage fright)
Fine muscle tremors
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Nonselective Adrenergic AntagonistsLabetalol: and 1 antagonist Partial 2 agonistCarvedilol and 1 antagonistAntioxidantAnti-ischemic agentRecent report supports it improves cardiac performance > than metoprolol in chronic heart failure
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AntagonistsAdverse EffectsCardiovascularInduce CHF or bradycardial arrhythmiaSudden withdrawal - in anginal patients may cause sudden death (due to receptor supersensitivity)
Bronchospasm
CNS - sleep disturbance, depression
Lacking recognition of hypoglycemia
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Penghambat Adrenergik / Simpatolitik
Penghambat AdrenergikReseptorPemakaian dalam klinikTolazolinHipertensiFentolaminHipertensiPrazosinHipertensiPropanolol 1, 2Hipertensi, aritmia, angina pectoris, pasca infark miokardiumNadolol1, 2Hipertensi, anginaPindolol1, 2 HipertensiTimolol1, 2 Hipertensi, pasca infark miokardiumMetoprolol1Hipertensi, angina, pasca infark miokardiumAtenolol 1Hipertensi, anginaAsebutolol1Hipertensi, aritmia ventrikel
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Thank you
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Benign prostatic hyperplasia (BHP)Incidence 50% of age >60 90% of age >85Definition: Nonmalignant enlargement of prostate due to growth of Epithelia/glandular (mechanical obstruction)Smooth muscle (dynamic obstruction - urethra)Symptoms: hesitancy, urgency, frequency, dysuria, nocturia, straining, dribbling, etc.
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AntagonistsMechanism & Sites of ActionsCardiovascular - vascular smooth musclecontractionReversal adrenalinePrejunctional 2 negative feedback on NE releaseNon-cardiovascular sitesBladder
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AntagonistsNonselectivePhentolamine (reversible, competitive)Phenoxybenzamine (irreversible, noncompetitive)Ergot alkaloids (dirty drugs with multiple sites of action)Selective 1 antagonists Prazosin Uroselective 1A antagonistsTamsulosin
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AntagonistsResponse in normal person during stressShort-term effectBlock heart sympathetic response rate and contraction - decrease CO block of sympathetic control of rhythm & automaticityIncrease TPR (block vascular 2 & increased reflex sympathetic tone)Long term effectCO remains downTPR returns to normal
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