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

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AdverseEvents
Adverse effects include headaches, depression, and increased liver enzymes. Patients may also experienceGIsymptomsandrashes.
Interactions
The effect of acyclovir and valacyclovir is increased in patients taking foscarnet. Acyclovir and valacyclovirmayincreasetheconcentrationsoftizanidine,clozapine,andzidovudine.Famciclovirdoes not have any significant drug interactions. Patients on antiviral therapy should not receive the live attenuatedzostervaccine(Zostavax)or varicella virusvaccine.Patientsshouldbe offantiviraltherapy forgreaterthan24hourspriortoreceivingthosevaccinesandshouldnotreceiveantiviraltherapywithin 14daysofreceivingthevaccine.Thisisbecauseantiviralswilldecreasetheefficacyofthevaccine.
Acyclovir
TheprototypicalantiviralagentacycloviractsbyinhibitingviralDNAreplication.Thedrugworksonly incellsinfectedbyHSV.Adisadvantageoforalacyclovirisitslowbioavailabilityof10%to20%and needforfrequentdosing.
The recommended acyclovir dosage for an initial and recurrent HSV-1 orolabial disease in both immunocompetentandimmunocompromisedpatientsis 400mgorallythricedailyfor5to10days(see
Table13.7). Immunocompromisedpatientsshouldcontinuetherapyuntil completeresolutionoflesions
has occurred. Suppressive therapy may be initiated for patients with severe or frequent recurrent infections,althoughbenefitis minimal(Chietal.,2015).Theregimenforprophylaxisis acyclovir400 mg orally twice daily. The need for prophylaxis should be regularly assessed. Pediatric dosing of acyclovirinHIV-exposedor-positivepatientsis20mg/kgfourtimesdaily,withamaximumdoseof400 mg,fourtimesdailyfor5 days.For immunocompetentpediatricpatientsrequiringchronic suppressive therapyforsevereandfrequentrecurrences,thedoseofacyclovirshouldbe10mg/kgthricedaily,witha maximumdailydoseof1g/d.Thisshouldbereevaluatedannually.
TherecommendeddosagefortreatingVZVinfectionsinimmunocompetentchildrenis20mg/kgorally fourtimesdailyfor5days,withamaximumdailydoseof3.2g.ForpediatricpatientsexposedtoHIVor whoareHIVpositive,itisrecommendedtoextendtreatmentdurationto7to10daysanduntil48hours afterthelastnewlesionforms.Adultdosingis800mgorallyfivetimesdailyfor5to7daysanduntilall lesionshavedried.Forcomplicatedcasesrequiringhospitalization,IVtherapyiswarranted.
Famciclovir
Famciclovirisapro-drugthatismetabolizedtoitsactiveform,penciclovir.Thedoseoffamciclovirfor herpeslabialisis1,500mgonceforimmunocompetentpatients.Itisbesttostarttherapywithin1hourof thefirstsignofinfectionifthepatienthasprodromalsymptoms.InpatientswithHIV,therecommended doseoffamcicloviris500mgbymouthtwicedailyfor5to10days.
Inuncomplicatedvaricellainfection(chickenpox),theregimenisfamciclovir500mgbymouththrice dailyfor5to7daysinaHIV-infectedpatient.Forherpeszoster,thedoseis500mgbymouththricedaily for7days.ForpatientswithHIV,thisregimencanbeextendedto10daysorlongeriflesionshavenot completelyhealed.
Valacyclovir
Valacyclovir is a pro-drug of acyclovir and is converted rapidly. First-pass metabolism converts valacyclovirtoacyclovir,withapproximately55%bioavailability.Forherpeslabialis,therecommended dose in immunocompetent patients is 2 g by mouth twice daily for 1 day. For severe and frequently recurringinfections,suppressivetherapywithvalacyclovir500mgto1gbymouthdailycanbeinitiated andperiodically reassessed. Inimmunocompromised patients, the recommended dose is 1 g bymouth twicedailyfor5to10daysanduntillesionsarecompletelyhealed.Suppressivetherapycanbeinitiated incaseofsevereandfrequentrecurrences.Thedoseis500mgbymouthtwicedaily.
Foruncomplicatedandmildvaricella(chickenpox)infection,therecommendeddoseis1gbymouth thricedailyfor5to7daysanduntillesionshavecompletelycrustedover.Therecommendedregimenfor herpes zoster infection is valacyclovir 1 g by mouth thrice daily for 7 days. Inimmunocompromised patients,treatmentdurationcanbeextendedto10daysorlongerifthereisslowresolutionoflesions.
SalicylicAcid
Salicylicacidisakeratolyticagentthatmaybeusedforcommonandplantarwarts.Itisavailableover thecounterandinavarietyofstrengthsforspecifictypesorsitesofverrucae.Itcomesinvariousdosage forms including plaster, collodion-like vehicle, and karaya gum-glycol plaster vehicle. Usually, 17% salicylicacidisusedtotreatsmalllesions.Apatchproductthatis40%salicylicacidplasterisusefulfor largelesionsandcanbecuttofitthewart.Comparedtonotreatment,salicylic acidcureswartsfaster (Loo&Tang,2014).
Dosage
For salicylic acid that comes in a collodion-like vehicle, a drop should be applied on the wart and allowedtodry.Whenusingthekarayagum-glycolplastervehiclepreparation,thewartshouldbeinitially flattenedgentlywithapumicestone.Adropofwarmwatershouldthenbeappliedtothewart,andthe plastershouldbeappliedatbedtimeandkeptonforatleast8hours.Itshouldberemovedwhenawake; this processcancontinuenightlyuntil thewartisremovedfor upto12 weeks.Salicylicacidpatches comeinplasterstrengthsrangingfrom12%to40%.Theplastershouldbecuttofitthewartandlefton for48hours.Thiscanberepeateduntilthewartisremovedforupto12weeks.Therearevariousover­the-counterproductswithsalicylicacid,andpatientsshouldbecounseledonreadingandfollowingthe directionsofuseonthepackage.
Contraindications
Topical therapy is contraindicated in patients with diabetes mellitus or impaired circulation and on moles,birthmarks,orunusualwartswithhairgrowth.Somesystemicabsorptioncanoccur,andtherapy shouldbeavoidedinpatientswithsalicylatehypersensitivity,includingthosewithanaspirinallergy.The mostcommonadverseeffectisskinirritation,whichcanbesevereenoughtodiscontinuetreatment.
SelectingtheMostAppropriateAgent
Whenselectingan agent, it is necessarytoconsider ease ofcompliance, cost, andefficacy profile of
medication. For warts, most patients will seek treatment for cosmetic purposes, and treatment with salicylicacidwillworkformostcommonandplantarwarts.Wartslocatedonthefaceorneck,suchas filiformorflatwarts,mayneedtoberemovedbyadermatologist.Thisprocedureiscommonlydonein theoffice.Mostwartscurethemselvesovertime,especiallyintheimmunocompetenthost.
First-LineTherapy:HerpesSimplexVirusType1
Herpeslabialisistypicallyself-limitingwithouttreatment.Forpatientswithrecurrentorsevereherpes labialis, oralantiviraltherapywithacyclovir,famciclovir,or valacyclovirshouldbe initiated.Topical antiviraltherapymaybeprescribedformildcasesinimmunocompetentpatients,althoughsymptomsmay onlybe reducedby a day,whichmaynotbe worththe expenseof thetreatment.Immunocompromised patientsshouldbetreatedwithoralantiviraltherapy.Costistypicallyadecidingfactorinwhichagentto select.Mostinsuranceswillcovervalacycloviroracyclovir,butmosttopicalantiviralpreparationsare notcoveredandexpensive.
Evidence for suppressive therapy suggests that topical antiviral preparations are ineffective in preventingrecurrencesandshouldnotbeusedfor thatpurpose. Oralantiviralsuppressive therapycan preventrecurrences,althoughthebenefitisminimal(Chietal.,2015).
First-LineTherapy:Varicella-ZosterVirus
Systemictherapyisusedonlyinpatientswithcomplicateddisease,childrenwithchronicpulmonaryor cutaneous disease or taking inhaled corticosteroids or long-term salicylate therapy,or anyone healthy abovetheageof12years.Itisprescribedonlyiftherashhasbeenpresentforlessthan24hours,asthat iswhenitwillworkbest.
First-LineTherapy:HerpesZoster
Systemicantiviraltherapycanbestartediftheherpeszosteroutbreakislessthan72hoursindurationor longerthan72hoursbutwithnewlesionsappearing,thepatientbeingolderthanage50,orthepatient being immunosuppressed. Therapy consists of systemic therapy with acyclovir, famciclovir, or valacyclovir.Mostoften,valacyclovirisprescribedtopatientswithinsurancecoverageasitistypically covered andhasa lessfrequentdosingschedule (Figure13.2). For patients withoutinsuranceorwith insurancethatdoesnotcovervalacyclovir,acyclovirwouldbeacheaperalternative.Patientswhohave receivedastemcelltransplantoranytransplantonanti-rejectionmedicationorthosewhoareshowing signsofextracutaneousinfectionshouldbehospitalizedandmanagedwithIVacyclovir.Theycanfinish therecommended14-daycourseofantiviraltherapywithoralacyclovir,famciclovir,orvalacyclovir.
Oralanalgesics,suchasacetaminophen,aspirin,andnonsteroidalantiinflammatorydrugs,arehelpful inpaincontrol.Patientswithneuropathicpain,commonlyassociatedwithshingles,mayneedmedication targetingneuralgiaprescribed,suchasgabapentinorlidocainepatches.
First-LineTherapy:Verrucae
For commonwarts,topical salicylicacid ina 17% concentrationisused;itis applied at bedtime for approximately 8 to 12 weeks or until the wart has healed. For plantar warts, a 40% salicylic acid preparationisusedinplasterorpatchformthatiscuttothesizeofthewartandappliedatbedtime.
Thepreparationremainsinplacefor24to48hours.Whenremoved,theareaisrubbedwithapumice stonetoremove dead whitekeratin.Thiscanbe repeatedforupto12weeksoruntilthewartisgone
(Figure13.3andTable13.8).
FIGURE13–2TreatmentalgorithmfortheHerpeszostervirusinfectionmanifestedasshingles.
Second-LineTherapy:Verrucae
Ifpatient-appliedtherapyfails,cryotherapy,carbondioxidelasertherapy,orpulseddyelasertherapycan beperformed.Pulseddyelasertherapyseemstohavetheleastadverseeffectsassociatedwithitwhen comparedwithotherlasertherapies(Nguyenetal.,2016).
MonitoringPatientResponse
Follow-upevaluationofHSVinfectionisnotrequiredifthesymptomsresolve.Forpatientswithherpes zoster,follow-upisrecommendedifpainorsymptomshavenotresolved.
Innon-anogenitalHPVinfections,multipletreatmentsmaybenecessary.Patientsshouldunderstandthe importance of follow-up beyondthe initial wart removal,becausethevirus may remain. Patients may needweeklytreatmentuntilthewartiseradicated.
FIGURE13–3Treatmentalgorithmforcommonwarts.
TABLE13.8
RecommendedOrderofTreatmentforNon-anogenitalInfectionwithHumanPapillomavirus
Order Agent Comments
Firstline Salicylicacid Usedasfirst-lineagenttotreatanywartnotonfaceAvailableOTC Secondline Cryotherapyorlasertreatment Referpatienttospecialist
OTC,overthecounter.
PatientEducation
LifestyleChanges
Educatingthepatientabouthygiene,precipitatingfactors,andpreventionisimperative.Viral infections arespreadbyskincontact,sopatientsneedtorecognizetheimportanceofwearinggloveswhenapplying medicationsandofthoroughhandwashing.Skin-to-skincontactshouldbe avoided. Patientswithwarts shouldbeinformedthattheymayrecur.
ComplementaryandAlternativeMedicine
Capsaicin cream can be used for pain control in herpes zoster, although data on its efficacy are insufficient.Teatreeandeucalyptusoilhavebeenreportedtohaveactivityagainstherpessimplex.Use ofalternativemedicationshaveverylimiteddataandshouldnotberoutinelyrecommended.
SpecialPopulations
VZV infections during pregnancy are extremely rare and can cause fetal abnormalities. If a pregnant womanisinfected,varicellazosterimmunoglobulinandantiviraldrugsshouldbeconsidered.
Prevention
There are no vaccinations for the prevention of HSV-1 infections. Patients should be counseled on preventingtransmissiontoother people by not sharingdrinks and avoidingkissing withactive herpes labialislesions.
VaccinationreducestheincidenceofVZV infections.Thevaricellavaccineisatwo-dose seriesthat canbegivenafter12monthsofbirth.Therehasbeensignificantdeclineintheincidenceofchickenpox sincethevaricellavaccinationprogramper theCenters forDiseaseControl andPrevention.There are twodifferentvaccinationsforthepreventionofherpeszosterandpostherpeticneuralgiainadults.Live zostervaccine(Zostavax)isasubcutaneousone-timeinjectiongiventoadultsovertheageof60years, and since it is a live attenuated vaccine, it cannot be given to immunocompromised individuals. Recombinantzoster vaccine (Shingrix) is the preferredshingles vaccine dueto itsbetter efficacyand longer-lasting effect (Dooling et al., 2018). The vaccine is given as two doses 2 to 6 months apart intramuscularlyinadultsolderthantheageof50years.
CASESTUDY1
B.H.isa72-year-oldmanwhopresentsforevaluationofseveralpainfulredbumpsonhisleftside. Thepainradiates aroundto hischest.Therashresemblesblistersthatarejustforming.Henoticed themyesterday,andmoreareforming.Hislaboratoryresultsareallnormal,andhiscreatinineis0.8 mg/dL.Hehasprescriptioninsurance(LearningObjectives2and3).
Diagnosis:HerpesZoster
1.What,ifany,riskfactorsdoesthispatienthavefordevelopingherpeszoster?
Answer:Patient'sagesuggeststhathehasbeeninfectedwithvaricellaasachild.
2.What,ifany,drugtherapywouldyouprescribe?Why?
Answer:Prescribevalacyclovir1,000mgthriceadayfor7 daysbecauseitiseasiertocomply
withthan5timesdailydosing.
3.Discusspatienteducationandpreventivemeasuresbasedonhishistoryandthetherapy.
Answer: Avoid contact with people while lesions are still wet especially with
immunocompromised individuals. Side effects ofvalacyclovirincludegastrointestinal (GI)upset and headache. Seek medical attention if altered mental status occurs as valacyclovir can have central nervoussystem (CNS)effectsinolder adults. Report anyneuropathic painas additional treatmentmayneedtobe prescribed. Get vaccinatedonce healed, preferablywith the two-dose seriesShingrex.
CASESTUDY2
M.R.isa66-year-oldwomanwithdiabetesmellitus.Sheisobeseandhasdifficultycaringforherself. Shepresentswithanon-purulenterythematousareaonherleftlowerlegthatbegan2weeksagoasan insectbite.Theareawasitchybutnotpainful.Shehashadanintermittent,low-gradefeverforthepast weekbutotherwise feels well. Shestates thattheredness hasgotten worse,andthere isnow mild swelling inher lower leg near the lesion. Her onlymedicationis insulin,andshe hasno allergies (LearningObjectives1and3).
Diagnosis:Cellulitis
1.Whatsignsandsymptomsdoesthispatienthavetosuggestcellulitis?
Answer:Non-purulenterythematousareathatstarted after aninsectbite.Itchy,intermittentlow-
gradefeversaresuggestiveofbacterialinfection.
2.Whatdrugtherapywouldyouprescribe?Why?
Answer: Dicloxacillin or cephalexin. These agents are recommended for patients with mild to
moderate cellulitis, where the most likely pathogens include beta-hemolytic Streptococcus (i.e., groupAStreptococcus).
3.Discussspecificpatienteducationbasedontheprescribedtherapy.
Answer:
1. Counselthepatienttocompletetheentirecourseofmedicationeventhoughsymptomsofinfection mayimprovequickly.
2. Direct the patient tocontacthis or herprovider ifsigns andsymptomsof infection do notget betterorbecomeworseinthenext48to72hours.Thereshouldbenospreadingoferythema.
3. Educatethepatientonthesignsandsymptomsofanallergicreactionandtoreportanyallergy symptomstotheprescriberorapharmacist.
4. GIupsetmayoccur;patientcantakewithfoodtominimizethisadverseeffect.Diarrheamayalso occur.
4.Whatwouldbethechoiceforsecond-linetherapy?
Answer:
1. If the patient has a life-threatening allergy to penicillins and cephalosporins, an acceptable alternativeantibioticforcellulitisisclindamycin.
2. Ifthepatientreceivesapenicillinorcephalosporinantibioticandsymptomsofinfectiondonot improveor worsen,thepatientmayrequireadmissiontothehospitalandintravenousantibiotic therapywithvancomycin.
5.Whatover-the-counteroralternativemedicationswouldbeappropriateforM.R.?
Answer:
1. Elevationof the affected limb and minimal weight bearingshould be recommended to reduce swellingandpreventinfectiouscomplications.
2. Mildpainrelieverscanberecommendedasneeded,thoughcoolsterilesalinedressingscanbea usefulalternative.
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