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Ординатура / Хирургия / Библиотека им академика М.И. Перельмана / Книга_5200_Библиотеки_им_академика_М_И_Перельмана

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days of therapy. After discontinuation of therapy, these reactions are uniformly reversible. The most commonlaboratoryabnormalityisanincreasedlevelofconjugatedbilirubin.
DrugInteractions
The CYP3A4 isoenzyme (responsible for the metabolism of many drugs) is significantlyinhibited by quinupristin/dalfopristin.Close clinical or serum level monitoringofknownsubstratesoftheCYP3A4 enzymeisrecommended.
PLEUROMUTILINS
Lefamulin (Xenleta) belongs to a new class of agents known as the pleuromutilins. This class is structurallyunrelatedtootheranti-infectiveagentsandisderivedfromthenaturallyoccurringtricyclic pleuromutilin, which received its name from the edible mushroom, Pleurotus mutilus (now called Clitophilus scyphoides). Lefamulinis a semisynthetic compound witha modification at the C-14 side chain, which is largely responsible for its excellent pharmacokinetics and tissue distribution profile, enhancedantimicrobialspectrum,andtheavailabilityofbothIVandoralformulations.
PharmacokineticsandPharmacodynamics
FollowingIVandoraladministration,lefamulinhasahalf-lifeofapproximately8hoursinpatientswith community-acquiredbacterialpneumonia(CABP).Itis95%boundtoplasmaproteinsandhasavolume ofdistributionof1.25L/kg.Table6.19providesdosinginformationforlefamulin.Thedoseinadultsis 150mgIV or 600 mgorallyevery12hours. Lefamulinisnotextensivelymetabolizedintheliver and doesnotrequireadjustmentsforrenalinsufficiencyorthosewithmildtomoderatehepaticinsufficiency. Nodataareavailableforpatientswithsevereliverdisease.Lefamulinisnotremovedbyhemodialysis.
Lefamulin is bactericidal against S. pneumoniae, H. influenzae, Neisseria gonorrhoeae, and MycoplasmagenitaliumandbacteriostaticagainstS.aureus.
MechanismofActionandSpectrumofActivity
Lefamulin inhibits bacterial protein synthesis by binding to the peptidyltransferase center of the 50S ribosomal subunitwithhigh affinityandspecificity ata unique binding site thatisdifferentthanother antimicrobial classes. Lefamulin is active against many gram-positive, fastidious gram-negative, and some anaerobic organisms and spirochetes. It is noteworthy that lefamulin activity possesses against MRSA and VRE, as well as multidrug resistant strains of S. pneumoniae, N. gonorrhoeae, and M. genitalium.
TABLE6.19
PleuromutilinDosages
Drug AdultDosages PediatricDosages
Lefamulin(Xenleta) 150mgIVq12hor600mgPOq12h
ClinicalUses
LefamulinisapprovedbytheFDAfortreatingCABPinadults.
AdverseEvents
Lefamulinisgenerallywelltolerated,withnauseaandabdominalupsetbeingthemostcommonadverse effectsreportedafteroraladministrationandlocalinfusionreactionsmostcommonlyreported after IV administration.Lefamulincanproduceaconcentration-dependentprolongationintheQTcinterval;thisis morepronounced(~10msincreaseonaverage)afterIVadministration.
DrugInteractions
Lefamulin tablets are contraindicated with sensitive CYP3A4 substrates that prolong the QT interval (e.g., pimozide) as this may result in increased plasma concentrations of these drugs, leading to QT prolongation.
ConcomitantuseoflefamulinIVororaltabletswithstrongandmoderateCYP3A4inducersorP-gp inducers should be avoided unless the benefit outweighs the risks. In addition, concomitant use of lefamulintabletsshouldbeavoidedwithstrongCYP3AinhibitorsorP-gpinhibitors.Concomitantuseof sensitiveCYP3Asubstrateswithlefamulintabletsrequiresclosemonitoringforadverseeffectsofthese drugs(e.g.,alprazolam,diltiazem,verapamil,simvastatin,vardenafil).
ANTIANAEROBICAGENTS
Clindamycin
Clindamycin (Cleocin) has been used extensively in treating gram-positive and anaerobic bacterial infections.Itwasfirstusedorallytotreatstreptococcalandstaphylococcalinfections,butitsoonbecame thedrugofchoiceforanaerobicinfections.Thecombinationofclindamycinandgentamicin(Garamycin) isstillfrequentlyusedintreatingmixedaerobicandanaerobicinfections.
PharmacokineticsandPharmacodynamics
Boththehydrochlorideandpalmitatehydrochloridesaltsofclindamycinarewellabsorbedandconverted toactiveformsintheblood.Clindamycinreachesmosttissuesandbone,butitsdistributionintoCSFis limited.Itis93%boundtoproteins.Thehalf-lifeisapproximately3hours.Clindamycinismetabolized bytheliver,necessitatingdosageadjustmentinpatientswithliverimpairment(Table6.20).Hemodialysis andperitonealdialysisdonotremoveclindamycintoasignificantextent.
MechanismofActionandSpectrumofActivity
Clindamycinbindstothe50Ssubunitofthebacterialribosomeandinhibitsproteinsynthesis.Itactsatthe samesiteaschloramphenicolandthemacrolides.
TABLE6.20
AntianaerobicAgents:Dosages
Drug AdultDosages PediatricDosages
Clindamycin 150–450mgPOq6–8hor600mgIVq8h 10–30mg/kg/dPOdividedq6–8h
25–40mg/kg/dIVdividedq6–8h
Metronidazole 250–500mgPOq6–8hor500mgIVq6–12h 15–35mg/kg/dPO/IVdividedq6h
Note:Dosageadjustmentrecommendedforpatientswithliverdysfunction. IV,intravenous.
ClinicalUses
Clindamycinis typicallyincludedinregimensforitsanaerobiccoverage inmixed infections andmay also beusedintreatinggram-positiveinfections,toxoplasmosis, andPCPorincombinationwithother agentstotreatPID.Inaddition,itisfrequentlyusedtoinhibittoxinproductionaspartofthetreatmentfor staphylococcalorstreptococcaltoxicshock.
AdverseEvents
Themajor sideeffectassociatedwithclindamycinis diarrheaandassociatedC.difficile colitis. This adverse eventisunrelatedtodoseandmayrangefromacute,self-limitingsymptomstolife-threatening toxicmegacolon.PainatthesiteofIVadministrationmayoccur.
DrugInteractions
In rare cases, clindamycin use in combination with skeletal muscle relaxants has been reported to potentiateneuromuscularblockade.
Metronidazole
Metronidazole (Flagyl) was first recognized for its antiprotozoal activity in treating Trichomonas vaginalis infections. Subsequently, its utilityas anantianaerobic agentwasusedintreatingB. fragilis
infections. Metronidazole has become a treatment of choice for anaerobic infections and is part of a numberofregimenstoeradicateHelicobacter pylori–associatedduodenalulcers. Metronidazole is no longerafirst-linetreatmentoptionforadultswithC.difficilecolitis.
PharmacokineticsandPharmacodynamics
MetronidazoleiscompletelyabsorbedfromtheGItractafteroraladministration.Itpenetrateswellinto mosttissues,withanapparentvolumeofdistributionof0.3to0.9L/kg.Itsbindingtoplasmaproteinis minimal. The liver metabolizes metronidazole, and dosage adjustments are necessary in patients with hepaticimpairment(Table6.20).Thehalf-lifeisapproximately6to9hours.Metronidazoleisremoved byhemodialysisandperitonealdialysis.
MechanismofActionandSpectrumofActivity
Metronidazole is reduced to a toxic product that interacts with DNA, causing strand breakage and resultinginproteinsynthesis inhibition.Metronidazolehasexcellentactivityagainstgram-positive and gram-negativeanaerobes,H.pylori,andprotozoasuchasT.vaginalis.
ClinicalUses
Metronidazole is typically included in regimens for its anaerobic coverage in mixed infections. In addition,metronidazoleisthetreatmentofchoiceforbacterialvaginosisandtrichomoniasisandmaybe usedtotreatC.difficilediarrheainpatientswhocannottolerateordonothaveaccesstovancomycinor fidaxomicin.
AdverseEvents
Metronidazole is usuallysafe andwell tolerated. GIsideeffectssuchasnausea, vomiting,abdominal pain,anda metallictastearemostcommon.Moreseriousbutrare effectsincludeseizures, peripheral neuropathy, and pancreatitis. Seizures have been associated with high doses, whereas peripheral neuropathyhasbeendocumentedinpatientsreceivingprolongedcoursesofmetronidazole.
DrugInteractions
Metronidazoleenhancestheanticoagulanteffectofwarfarin,resultinginaprolongedhalf-lifeofwarfarin. Adisulfiram-likereactioncharacterizedbyflushing,palpitations,nausea,andvomitingmayoccurwhen alcohol is consumed during metronidazole therapy. Metronidazole is an inhibitor of the CYP3A4 isoenzyme. It has the potential to interact with multiple medications. Additionally, phenobarbital, phenytoin,andrifampinincreasethemetabolismofmetronidazole,whichmayresultintreatmentfailure. A careful review of a patient’s medication list for drug interactions should be done before initiating metronidazole.
MISCELLANEOUSANTIMICROBIALAGENTS
Chloramphenicol
Chloramphenicol has a wide spectrumof activityagainst gram-positive, gram-negative, and anaerobic organisms.However,itsusehasbeenlimitedbyitstoxicityprofile,whichincludesgraybabysyndrome, opticneuritis,andfatalaplasticanemia.Nonetheless,inselectedsituations,chloramphenicolremainsan importantagent.
PharmacokineticsandPharmacodynamics
ChloramphenicolisavailableasanIVsuccinateester.Thedoseisbasedonageandindication(Table
6.21). The ester formulationis hydrolyzedin the bodyto the active drug.Chloramphenicol penetrates
wellintomosttissuesandbodilyfluids,includingtheCSF.Chloramphenicolreadilycrossestheplacenta inpregnantfemales.Itisconjugatedintheliverandexcretedbythekidneyinaninactive,nontoxicform.
Theserumhalf-lifeis3to4hours.Chloramphenicolis25%to50%boundtoprotein.
TABLE6.21
MiscellaneousAgents:Dosages
Drug AdultDosages Pediatric
Dosages
Chloramphenicol Olderchildrenandadults:50–100mg/kg/dIVdividedq6h(max4,000mg
daily)Olderchildrenandadultswithmeningitis:75–100mg/kg/dIVdivided q6h
Olderchildrenandadultswithmeningitis:75–100mg/kg/dIVdividedq6h
Nitrofurantoin 50mgPOq6h(macrocrystal)or100mgPOq12h(macrocrystal
monohydrate)
5–7mg/kg/dPO dividedq6h
Rifampin 600mgPOoncedailyor10–20mg/kgIVdaily 10–20mg/kgIV
generallyonce daily
Notes:Chloramphenicolshouldbeusedwithcautioninpatientswithrenalimpairment,andserumconcentrationsshouldbemonitoredtoguide dosingandpreventtoxicity.
Dosageadjustmentforrifampinisrecommendedforpatientswithliverdysfunction. Nitrofurantoiniscontraindicatedinpatientswithacreatinineclearanceof<60mL/min. IV,intravenous.
Serumlevelsarefrequentlymonitoredinhigh-riskpatients.Thetherapeuticrangeofchloramphenicol is5to20mg/dL.Dose-relatedmyelosuppressiontypicallyoccursatserumlevelsexceeding25mg/dL.
MechanismofActionandSpectrumofActivity
Chloramphenicolreversiblybindstothelarger50Ssubunitoftheribosome,therebyinhibitingbacterial proteinsynthesis.Itisvariablybactericidal.
Chloramphenicolisactiveagainstgram-positiveandgram-negativeaerobesandanaerobesaswellas atypicalorganisms,includingmycoplasma,chlamydia,andrickettsia.Itsgram-negativeactivityincludes E.coli,Proteusspecies,andSalmonellaspeciesbutnotP.aeruginosa.
ClinicalUses
Neweragentshavereducedtheneedtousechloramphenicolintreatinginfection.However,itcanbeused asanalternativeintreatingbacterialmeningitiswhenapatienthasalife-threateningpenicillinallergy.It is alsouseful intreatingrickettsialdiseasessuchas RockyMountainspottedfever andtyphusfever in patientsallergic totetracyclinesor inpregnantwomen.Chloramphenicol maybe usedintreatingVRE infectionsaswell.
AdverseEvents
Themajoradverseeventsassociatedwithchloramphenicol are graybabysyndrome,blood dyscrasias, and optic neuritis. Gray baby syndrome typically occurs in neonates and is manifested by vomiting, lethargy, respiratory collapse, and death. It results from drug accumulation because neonates cannot
conjugate chloramphenicol. Two forms of hematologic toxicity may occur with chloramphenicol administration. Dose-related bone marrow suppression has occurred in patients receiving doses exceeding 4 g/d andat serumlevels exceeding25 mg/dL.Itmaypresentasacombinationofanemia, leukopenia, andthrombocytopenia. Aplastic anemiais an idiosyncratic effectindependentof dose and mayoccurweeksaftertherapywithchloramphenicol.Itisassociatedwithagreaterthan50%mortality rateandoftennecessitatesbonemarrowtransplantation.Opticneuritisisamajorneurologiccomplication andisassociatedwithlongcoursesofchloramphenicol.Thetoxicityinvolvesred-greencolorchanges andlossof vision.Itmaybe reversibleorpermanent. GIsideeffects havebeenassociated withhigh dosesofchloramphenicol.
DrugInteractions
ChloramphenicolismetabolizedbytheliverandisaninhibitoroftheCYP2C19andCYP3A4enzymes.It prolongsthehalf-lifeofwarfarin,phenytoin,andcyclosporine.
Rifampin
Rifampinisamacrocyclicantibiotic usedina varietyofsettings,anditisa first-lineagentintreating tuberculosis. It is typically combined with other antibiotics such as vancomycin in treating MRSA infections.
PharmacokineticsandPharmacodynamics
Rifampin is completely absorbed after oral administration. It distributes into most tissues and fluids, includingtheCSF.Thehalf-lifeofrifampinisapproximately3hours.Itismetabolizedbytheliverandis notremovedbyhemodialysisorperitonealdialysis.Table6.21providesdosinginformation.
MechanismofActionandSpectrumofActivity
Rifampin suppresses initiation of chain formation for ribonucleic acid(RNA)synthesis in susceptible bacteriabyinhibitingDNA-dependentRNApolymerase.Thebeta-subunitoftheenzymeappearstobethe siteofaction.
Rifampin is extremely active against gram-positive cocci. It has moderate activity against aerobic gram-negative bacilli. Neisseriameningitidis, Neisseria gonorrhoeae,andH.influenzaeare the most sensitivegram-negativeorganisms.RifampinmaintainsactivityagainstM.tuberculosis.
ClinicalUses
Rifampiniscommonlyusedincombinationwithacellwall–activeagenttotreatserious,gram-positive infectionsthatfailtorespondtoothercoursesoftherapy.Thiscombinationisusedforsynergisticactivity and prevents rapid resistance development. It is the drug of choice for postexposure meningitis prophylaxis against N. meningitidis and H. influenzae type B. Rifampin is a first-line agent in the treatmentofM.tuberculosisinfection,anditisusedtotreatnontuberculousmycobacterialinfectionsas well.
AdverseEvents
ThemostcommonsideeffectsassociatedwithrifampinareGIdistress(nausea,vomiting,anddiarrhea), headache, and fever.Rifampinchanges bodilyfluids suchas sweat, saliva, and tears to a red-orange color.Hepatotoxicityisrare,buttheriskincreaseswhenitisadministeredincombinationwithisoniazid. Liver functionshouldbemonitored while patientsreceive rifampin. Anemiaorthrombocytopeniaalso hasbeenreported.
DrugInteractions
Rifampinisa potentinducer ofhepaticCYPdrugmetabolismandprecipitates manydruginteractions. Rifampin increases the clearance of agents such as antiarrhythmics, azole antifungals, clarithromycin, estrogens,moststatins,warfarin,andmanyHIVmedications.Acarefulreviewofthepatient’smedication listfordruginteractionsshouldbedonebeforeinitiatingrifampin.
Nitrofurantoin
Nitrofurantoin is an antimicrobial agent used only for treating and preventing urinary tract infections. Nitrofurantoin has been used in the United States since 1953 and still remains very effective. It is a syntheticnitrofuran-compoundderivative,aclassthatalsoincludesfurazolidone,availableinEurope.
PharmacokineticsandPharmacodynamics
Followingoraladministration,nitrofurantoinisrapidlyabsorbed.Thebioavailabilityofnitrofurantoinis approximately40%to50%.Absorptioncanbeenhancedwithfood.Nitrofurantoinserumconcentrations arelow,withaserumhalf-lifeoflessthan30minutes.Forthisreason,nitrofurantoinshouldnotbeused for complicated urinary tract infections or in patients for whom a concern of bacteremia exists. Nitrofurantoin undergoes renal elimination. Inadequate urinary concentrations are achieved in patients with renal insufficiency;thus, thedrugis ineffective. Itiscontraindicated inpatientswitha creatinine clearanceoflessthan60mL/min.Table6.21providesdosing
MechanismofActionandSpectrumofActivity
The exact mechanism of nitrofurantoin is poorly understood. The drug does inhibit several bacterial enzymes,whichresultsinimpairedbacterialcellwallsynthesis.
Nitrofurantoinhasadequateantimicrobialcoverageagainstcommonorganismsthatcauseurinarytract infections such as E. coli, Citrobacter species, Staphylococcus saprophyticus, E. faecalis, and E. faecium.NitrofurantoinfrequentlycoversstrainsofVRE.Resistancehasincreasedagainstsometypesof bacteria,suchasEnterobacterandKlebsiellaspecies.
ClinicalUses
Nitrofurantoinisonlyusedforthetreatmentandprophylaxisofuncomplicatedurinarytractinfections.As mentionedearlier,itshouldnotbeusedforcomplicatedurinarytractinfectionssuchaspyelonephritis.
AdverseEvents
Themostcommonsideeffectsofnitrofurantoinincludenauseaandvomiting.Nitrofurantoinmaycausea harmless yellow-brown discoloration of urine. Allergic reactions are rare. Pulmonary reactions (pulmonaryinfiltrates,pneumonitis,pulmonaryfibrosis)andhepaticeffects(hepatitis,hepaticnecrosis) have been reported in rare cases, usually associated with long-term use. Additionally, peripheral neuropathyhasbeenassociatedwithlong-termuseinpatientswithrenalfailure.
DrugInteractions
Nitrofurantoinisnotassociatedwithsignificantdruginteractions.
ANTIMICROBIALRESISTANCE
There are multiple mechanismsbywhichbacteriaformor acquire antibiotic resistance.Sometypesof resistance occur naturally, while others are acquired from another strain of bacteria. Additionally, resistancecansometimesbeinducedduringantibiotictreatment.Table6.22summarizesthemostcommon resistancemechanisms.
1.Themostcommontypeofresistanceisbacterialenzymeproduction.Forexample,bacteriafrequently
produceenzymesthatdisruptbeta-lactamantibiotics,alteringthestructuresotheycannotbindtothe PBPs. There are hundreds of different types of these enzymes known as beta-lactamases. Some enzymes have activity only against penicillins (penicillinases), whereas others, such as extended­spectrum beta-lactamases, can render almost all beta-lactam antibiotics ineffective. Separate from beta-lactamases,bacteriaalsoproduceenzymesthatcanalterthechemicalstructureorinactivatethe drug. This can occur with aminoglycosides, chloramphenicol, macrolides, streptogramins, and tetracyclines.
2.Resistancecanoccurasthebacteriaaltertheirowncellmembranes,notpermittingantibioticstoenter
thebacteria.Anexampleofthisislossofporinsonthegram-negativebacterialcelloutermembrane. Specifically, withbeta-lactam antibiotics,lossofthese porinsalterstheabilityoftheantimicrobial agenttoenterthecell.
3.Athird,commonmechanismofresistanceistheactivationofeffluxpumpsthatexpelantibioticsoutof
theintracellular space backacrossthecellmembrane.Thispreventsantibioticsfromacting attheir intracellulartargetsite.Thisisacommonmechanismofresistancewithclassessuchastetracyclines andmacrolides.
4.  A fourth type of resistance is alteration of the antibiotic’s target site of action. This occurs with
macrolides,amongotherclasses,whenmutationsaltertheribosomalbindingsite.Theantibioticdoes notbindas wellor at allto theribosomeanymore.Similarly, VREisa resultofalteredcellwall precursors. Plasmid-mediated resistance results in a modified peptidoglycan precursor that binds vancomycin,preventingitfrombindingtoitsintendedtargetsite.
5.Afifthtypeofresistanceisalterationoftargetenzymes.Forexample,theFQsworkbyinhibitingthe
enzymesDNAgyraseandtopoisomeraseIV.Mutationstoavarietyofdifferentchromosomesonthese enzymescanreducetheefficacyoftheFQs.
6.  Last, overproduction of target enzymes can result in resistance. The best example of this is with
sulfonamides and TMP. SMX–TMP works by inhibiting folic acid synthesis by inhibiting the
dihydropteroate synthetase and dihydrofolate reductase enzymes, respectively. These enzymes are requiredforbacterialfolicacidsynthesis.Excessproductionofthesetwoenzymesinsomestrainsof bacteriacanrendertheantibioticineffective.
Aspecificarea ofinterestinantimicrobialdevelopmentistargetingthepreventionoforovercoming drugresistance.
TABLE6.22
AntimicrobialResistance
ANTIMICROBIALSTEWARDSHIP
Overuse of antibiotics is well documented and has led to increased resistance to various strains of bacteria worldwide. Some examples of drug-resistant bacteria include extended-spectrum beta­lactamases against E.coli and Klebsiella, carbapenem-resistant Klebsiella, FQ-resistant gonococcus, MRSA, and vancomycin-intermediate S. aureus. The IDSA and Centers for Diseases Control and Preventionhavedevelopedcoreprinciplesfortheimplementationofantimicrobialstewardshipprograms for both the inpatient and the outpatient settings. These guidelines stress the importance of a multidisciplinaryteamapproachtoimprovingantibioticuse,withafocusonensuringthatthebestdrug,at thebestdoseandduration,isprescribedtopatients.
CASESTUDY1
J.G., a 55-year-old man, is started on daptomycin for methicillin-resistant Staphylococcus aureus (MRSA)bacteremiaandpresumptiveendocarditis.Hismedicationsincluderivaroxaban,atorvastatin, andlorazepam. 
1.Whichofthefollowingistruefordaptomycin?   a.ItiseffectiveagainstMRSAandvancomycin-resistantenterococci(VRE).   b.Itworksbydisruptingbacterialcellwallsynthesis.   c.Hecanbeconvertedtooraltreatmentassoonashiswhitebloodcellcountdecreases.   d.Thrombocytopeniaoccursinasmallpercentageofpatients.
Answer:a.
2.  About 1 week later, J.G. complains of lower extremity muscle aches and pains. Which of the followingisaprobablereasonforthesesigns/symptoms?
  a.Daptomycinisknownforcausingflu-likesymptoms.   b.Daptomycinisinteractingwiththerivaroxaban,leadingtoadeepveinthrombosis.   c.J.G.’sinfectionisgettingworseandvancomycinneedstobeaddedtotheregimen.   d.Atorvastatinisinteractingwiththedaptomycin,creatingarhabdomyolysis-likesyndrome.
Answer:d.
Afewexamplesofwaystoimproveantibioticuseincludeinfectiousdiseasespecialistoversightofthe use ofspecificantimicrobials, theuseofrapiddiagnostics andevidence-based prescribing,theuseof pharmacokinetic-pharmacodyamic-guided dose optimization, antibiotic streamlining, and de-escalation andtheuseofvaccinesandotherinfectionpreventionprinciples.
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