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

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drivenmorebyresistancepatternsinpathogenscoveredbytheclassthanthepotentialriskofarthropathy tothepatient.
Cardiovascularsafetyandadversepsychiatriceffectsareaconcernwiththeuseofpsychostimulantsin thetreatmentofattentiondeficithyperactivitydisorder(ADHD).Averysmallnumberofcasereportsof suddencardiacdeathhavebeenreportedinchildrenprescribedpsychostimulantsforADHD.Theriskhas beenfoundtobegreaterinpatientswithunderlyingcardiacstructuralabnormalities.However,theriskis similar to thatof strenuousexercise inthis population, andthe useinthegeneral populationdoes not necessitateadditionaltestingbeyondnormalscreening.Thereisalsoasmallriskofpsychosisandmania­type reactions in children. As a result, the FDA requires the pharmaceutical industry to provide medication guides to patients and prescribers explaining the risks of ADHD drug treatments and informationontheirpotentialsideeffects.
Another widely used drug class with specific safety concerns in the pediatric population is antidepressants. There is a very slight increase in suicide risk in patients started on antidepressants, whichlikelyreflectsthecurrentdepressedstateandothercomorbidities.TheFDAhasincludedablack box warning for increased suicidality for children and adolescents initiating all classes of antidepressants. Although this is a statistically significant increased risk compared to the normal population,theriskofsuicideinuntreateddepressedpatientsismuchhigher.
Long-TermEffects
Drugsadministeredtopediatricpatientsmaytakealongertimetoproduceadverseeffectsthaninadults. Certain adverse effects may not be detected until decades after treatment. For example, secondary cancers,growthretardation,hypogonadism,andsterilityhaveall beenreportedas lateadverseeffects associated with certain antineoplastic therapies. Inhaled and intranasal corticosteroids may decrease growthvelocity,whichisa meansofcomparinggrowthrates amongchildrenofthesameage.Studies withinhaledsteroidsshowedanapproximately1-cm/yreductioningrowthvelocity.TheFDAsuggests that the reduction is related to dose and how long the child takes the drug (U.S. Food and Drug Administration,1998b).LoneandPederson(2000)evaluatedthelong-termeffectongrowthofinhaledor intranasal budesonide in pediatric asthma patients. At the end of this 10-year study, the researchers concluded that normal adult height was achieved in patients receiving these corticosteroids. More recently, theChildhoodAsthmaManagementProgram(CAMP) ResearchGroupshoweda reductionof
1.2cminadultheightintheinhaledbudesonideversusplacebogroup(Kellyetal.,2012).
Potentiallong-termeffectsofmedicationsusedinchildrencreateaconcern.The5-yearsurvivalrates ofmostpediatricmalignanciesareexceeding80%inmosthighincomecountries.Thishasledtoafocus on the late effects of therapy and the quality of life in this growing population of childhood cancer survivors (Erdmannetal.,2020).Nearlytwo thirdsofallchildhoodcancersurvivors will experience somephysicalorpsychologicoutcomethatdevelopsorpersistsbeyond5yearsfromtheinitialdiagnosis (Shankaretal.,2008). Othermedicationsusedinpediatricsmayalsocarryrisksfor long-termeffects. Unfortunately,theseeffectsmaynotbeseenforyearsafterthemedicationisstopped,andtherearelikely otherfactorsthatcouldcauseoratleastcontributetotheeffect.Studiesthatevaluatethelong-termeffect ofamedicationareverydifficulttoperformandoftenyieldconflictingresults.
DosageFormulation
Commerciallyavailabledosageformulationsoftenlimitthedrugsthatcanbeprescribedtochildrenand
arenotalwayschildfriendly.Manydrugsare availableonlyasanoral tablet,capsule,or intravenous dilutioninadultdosagestrengths.Prescribinga drugasa tablet or capsule fora pediatric patienthas several drawbacks. The pediatric patient may have difficulty swallowing a whole or intact tablet or capsuleandattemptingtobreakatabletintosmallerpiecesoremptyingpartofacapsuletoprovidean appropriatedose leads toquestionable accuracyofthe administereddose.Itisimportanttoprovidea dosageformthatcanbe administered easily,accurately,andsafelytoapediatric patient.Amethodto improveadministrationisviaextemporaneousformulations,especiallyifaproductisnotcommercially availableasanelixir,solution,suspension,orsyrup.However,theseoralliquidformulationsalsohave drawbacks, such as an unfavorable taste. Other alternatives to oral liquid formulations include tablet dispersion,powderedpapers,andrepackedcapsules.Combinationproductsareavailabletoreducepill burdenandimprovemedicationadherence.However,theseagentscontainfixeddosageformsintablets orcapsules,makingitdifficultforachildlessthanage5toswallow.
Ideally, a practitioner who is prescribing a dosage formulation not commercially available for a pediatricpatientoughttoworkwithapharmacistwhoiswillingandabletocompoundaccuratepediatric drugdosages and formulas. Practitioners can familiarizethemselves with additional drugs thatcan be extemporaneouslycompounded foruse inpediatrics bya pharmacistinsuchpublicationsas Pediatric
DrugFormulations(Nahata&Pai,2018);TeddyBearBook:PediatricInjectableDrugs(Phelps,2018); Pediatric Dosage Handbook (Taketomo et al., 2019); Extemporaneous Formulations for Pediatric, Geriatric, and Special Needs Patients (Jew et al., 2016); or Trissel’s Stability of Compounded Formulations(Trisseletal.,2018). AMedlinesearchshouldbe conductedfor drugsnotcontainedin
thesepublications.
Dosage
Inadultdrugtherapy,onestandarddoseofadrugcanbeusedforalmostalladults,buttheoppositeis trueinpediatricdrugtherapy:Apediatricdrugdosechangesfordifferentillnessesorasthepatientgrows ordevelopsandrequiresage-dependentadjustments.
When writing or assessing a pediatric medication order, the following process is recommended to ensuresafeandeffectivepharmaceuticalcare:
1.Determinethepatienttype(i.e.,neonate,pediatric,adolescent).
2.Assesstheappropriatenessofthedrugtherapyselectedinthispatienttype,patientpopulation,and/or
diseasestate.
3.  Establish the appropriate dose, route, formulation, and frequency based on the recommended
referencesdescribedintheparagraphbelow.
4.Ifallresourceshavebeenexhaustedorfurtherinformationisneededregardingthepediatricdosage,
contactapharmacist.Itisimportanttoensurethatthedoseisappropriateorreasonablebasedonthe pharmacist’sknowledgeofpediatricpharmacokineticsandavailableresources.
Manydrugs currentlyinuse inpediatrics have established dosing recommendations based onbody weight, BSA, concurrent drug therapy, and stage of development or physiologic function (age). Body weight–baseddosingisthemostcommonmethodforpediatricdosing.Atotaldailydose,milligramsper kilogram per day (mg/kg/d), is divided by the dosing interval to calculate each individual dose. Analgesics,antipyretics,andemergencydrugsareoftenadministeredonadose-by-dosemethod;assuch, the recommended pediatric dose is reported as milligrams per kilogram per dose (mg/kg/dose). The
starting or maximum doses for pediatric intravenous infusions areusuallyreportedasmicrogramsper kilogramperminute(mcg/kg/min)ormicrogramsperkilogramperhour(mcg/kg/h).Drugdosagesbased onapatient’sBSAareusuallyreservedforantineoplasticagentsorcriticallyillpatients.BSAcorrelates closely with many factors that influence drug elimination, including cardiac output, respiratory metabolism,bloodvolume,extracellularwatervolume,GFR,andrenalbloodflow.Dosagesofseveral drugs,includingdocusate(Colace)andmontelukast(Singulair),arebasedonage.
GeneralpediatricdrugreferencessuchasthePediatricDosageHandbook(Taketomoetal.,2019)and Micromedex (MICROMEDEX Solutions, 2020) provide comprehensive drug monographs, including dosageformulations,adverseevents,pharmacology,andpharmacokinetics.TheHarrietLaneHandbook (Hughes&Kahl,2017)providesdrugmonographsbasedontheJohnsHopkinsHospital formularyand specialdrugtopics.AspecialtypediatricreferencesuchastheRedBook(Kimberlinetal.,2018)covers onlyantimicrobialagentsandvaccines;Neofax(Neofax,2020)providesinformationaboutdrugdosingin neonates.
Obesity
Obesity, defined in children as a body mass index (BMI) at or above the 95th percentile for age, is considered a public health crisis in the United States (Ogdenet al., 2010). Nearly 1 in 5 school-age childrenandyoungpeopleareobeseintheUnitedStates(Halesetal.,2017).ChildrenwithaBMIator abovethe85thpercentileareconsidered“atriskforoverweight,”andnearly32%ofU.S.childrenages2 to 19 fall into this category (Ogden et al., 2010). While it is known that there is an overall lack of informationondosagesregardingmostmedicationsinchildren,thereisfar lessinformationonproper medicationdosingintheoverweightchild.Obesitycanaffectthepharmacokinetics,dosing,half-life,and metabolismofamedication.Medicationsoriginallyintendedforadultusearenowbeingutilizedtotreat hypertension, hyperlipidemia, and type 2 diabetes as these diseases are on the rise secondary to the increaseinobesity(Kennedyetal.,2013).Thereisagreaterriskofdosingerrorsinoverweightchildren, specifically for underdosing and overdosing of antimicrobials (Matson et al., 2017). The Pediatric PharmacyAdvocacyGrouprecommendsthatweight-baseddosingbe utilizedfor allchildrenlessthan age18andweighinglessthan88lbs(40kg).Forchildrenwhoweighover40kg,weight-baseddosing shouldbe used,unlessthepatient’sdose or dose perdayexceedstherecommendedadultdose forthe specificindication(Matsonetal.,2017).
RoutesofAdministration
Oral
Whenprescribingoradministeringoraldrugsforpediatricpatients,thecaregiverneedstoconsidernot only the drug’s flavor and ease of delivery but the frequency of administration, dosage form, and “inactive”ingredients,suchasalcoholandsugar.Aliquiddosageformispreferred formostpediatric patients.
Toensuretheaccuracyofeachdoseadministered,thedrugshouldbemeasuredandthenadministered withanoralsyringeoracalibrateddrugcup,withthebaseofthemeniscusviewedateyelevel.Ifthe drugisavailableonlyintabletformandthetabletcanbebroken,thetabletmaybecrushedandmixedin compatible syrup. However, mixing a crushed or whole tablet with food should be done cautiously
becausemanyfoodsinterferewithdrugabsorption.
Ifthepatientisaninfant,theheadshouldberaisedtopreventaspirationofthedrug.Applyinggentle downwardpressureonthechinwithathumbhelpsopenthepatient’smouth.Ifasyringeisused,thetipof thesyringeshouldbeplacedinthepocketbetweenthepatient’scheekandgumandthedrugadministered slowlyandsteadilytoreducetheriskofaspiration.
Forbottle-fedinfants,thedrugcanbeplacedinanipple andtheinfantallowedtosuckthecontents. However,adrugshouldneverbemixedwiththecontentsofababy’sbottlebecausethecorrectdosewill notbereceivediftheinfantdoesnotconsumethefullcontentsofthebottle.Inaddition,adrug–nutrient interaction may occur if a drug is mixed with formula feeds. A classic example of a drug–nutrient interactionisthesignificantreductionoforalphenytoinabsorptionafterconcurrentadministrationwithan enteralfeedingformula(Sacks&Brown,1994).
Rectal
Toddlers beingtoilettrained,especiallychildrenexperiencingstressordifficulty,oftenresisttherectal administrationofdrugs.Older childrenmayperceivetheprocedureasaninvasionofprivacyandmay react withembarrassmentoranger andhostility. Thebestapproachto reducinganxietyandincreasing cooperationistospendtimeexplainingtheprocedureandtoreassurethechildthatgivingdrugsbythis routewillnothurt.Itmaybenecessary,afterplacingasuppository,toholdthechild’sbuttockstogether forafewminutestopreventexpulsionofthedrug.
Parenteral
Establishing venous access, venipuncture for blood samples, and intramuscular injections are a great source ofdistressandpain for children. Several local anesthetic agents havebeendeveloped tohelp managethepainandanxietybroughtonbytheseprocedures.Theidealproductwouldhaveneedle-freeor topical administration,a rapid onsetof anesthetic, andnodermal orsystemicadverse effects,andthe productwouldhavenoimpactonthesuccessrateoftheprocedure.Nocommerciallyavailableproduct hasallthesequalities.Thethreegeneraldeliverymethodsusedtobypassthestratumcorneumlayerare directinjectionoflocalanesthetics,passivediffusionfromtopicallyappliedgelsorcreams,andseveral needle-freemethodsthathastentherateofdrugpassagethroughtheskinandspeedthetimetoonsetof action. Table 4.6 lists the methods of drug delivery, the available agents, and the advantages and disadvantagesofeach(Zempsky,2008).
TABLE4.6
TopicalAnesthetics
Method Product(s) Medication(s) OnsetofTopical
Anesthesia
AdverseReactions
Injectionoflocal anesthetics
Lidocaine,Lidocaine bufferedwithsodium bicarbonate
Lidocaine <1min Painassociatedwith
initialneedlestickfor injectionofmedication
Lidocaineneedle-free injection
J-Tip® Lidocaine <1min “Poppingnoise”with
administration(may frightensomechildren)
Passivediffusionwith EMLA®,generic Lidocaine,2.5%; 30min(minimum), Skinblanching,rare
topicalcreamsorgels prilocaine,2.5% 60minformore
completeeffect
methemoglobinemiain infants
LMX4® Liposomal
lidocaine,4%
30min Erythema,blanching
Needle-freestrategiesto accelerateonset
Synera® Lidocaine/tetracaine 10min Localreactions
(erythema,71%; blanching;andedema)
Lidocaineiontophoresis NumbyStuff® Lidocaine 10-15min Intolerabletingling,
itching,burning sensation,discomfort, potentialforburn
LidocaineHCl monohydratepowder intradermalinjection system
Zingo® LidocaineHCl
monohydrate
1-3min Localreactions
(erythema,62%; petechiae,52.8%)and edema
Vapocoolantsprays PainEase® Liquidrefrigerant
(ethylchloride)
Immediate(may requiretwo providersaseffect lasts11min)
Someskinpigmentation changes(temporary)
J-Tip,EMLA,LMX4,Synera,NumbyStuff,Zingo,andPainEase
Pulmonary
Nebulizers,pressurizedmetered-doseinhalers(pMDIs),anddrypowderinhalers(DPIs)canbeusedto deliver bronchodilators and corticosteroids in the treatment of asthma. Nebulized drugs require connectinganairoroxygentubetothenebulizermachineandareoftenusedininfantsandyoungchildren. pMDIsrequirecoordinationbetweenactuationandinhalation;thisisdifficultinanyagegroup,soatube spacerisrecommendedforchildrenofallages(GlobalInitiativeforAsthma,2019).Spacerdeviceshave expandedtheuseof metered-dose inhalerseventotheneonatal population.ADPIsuchasbudesonide powder(PulmicortTurbuhaler) involves coordinationwiththepatient’sinspiratoryflow;therefore,the delivery mechanism is not recommended in children less than age 4. Table 4.7 summarizes the recommendedpopulationforaerosoldeliverydevices(GlobalInitiativeforAsthma,2019).
Topical
Thetopicaldeliveryofmedicationsiscommoninthepediatricpopulationwithdiseasessuchaseczema and acne as well as other skin disorders that appear during childhood. Caution is warranted in this populationduetoseveralfactorsthatmaylead toa higher rateofdrugabsorption.Whencompared to adults,infantsandchildrenhaveahigherratioofskinsurfacetobodyweight.Thisincreasestheriskof accumulatingsignificantserumdruglevels(Metry&Herbert,2000).Itisespeciallytrueinthenewborn andinfantbecausethebarrierfunctionoftheirskinisimmature.Parentsmustbecautionedtofollowthe directions for administration of all topical medications to prevent toxic drug levels. A fatal case of diphenhydramine toxicity has been reported in the literature, largely due to excessive application followingabathinachildwitheczema(Turner,2009).
TABLE4.7
RecommendedAgeGroupsforAerosolDeliveryDevices
Device Age
Nebulizer •Anyage pMDI •Anyage(withvalvedspacer)
•>8yold Breath-actuatedpMDI •>7yold Drypowderinhaler •>5yold
pMDI,pressurizedmetered-doseinhaler.
MEDICATIONSAFETY
Ensuringeffectiveandsafedeliveryofdrugstofetusesandpediatricpatientsinvolvesunderstandingthe physiologicchangesthatoccurthroughoutchildhoodandpregnancy.SincethestartoftheInstituteforSafe Medication Practices in 1994, pediatric medication safety movements have progressed over time. In 2004,theInstituteof Healthcare Improvement(IHI) introducedthe100,000Lives Campaigntoprotect patients from medical harm. Two years later, the IHIlaunched the 5 Million Lives Campaign with a pediatricnitiative toreduce adverse drug events anddecrease harmfrom high-alert medications (i.e., anticoagulants, sedatives, opioids, insulin) (Institute of Healthcare Improvement, 2006). The Joint CommissionSentinelEventAlertstatedthatharmcausedbymedicationerrorsisthreetimesgreaterin pediatricpatientsthanadults(TheJointCommission,2008).Asaresult,TheJointCommissionIssue39 recommendsinitiativestopreventmedicationerrorsandsuggestsriskreductionstrategies.Box4.1gives some recommendations to assist health care professionals in reducing medication errors (American AcademyofPediatrics,2003;TheJointCommission,2008).Inthefuture,pediatricpharmacotherapywill evolvewithadditionallegislationandsafetymovements.
Box4.1 PreventingPediatricMedicationErrors
AmericanAcademyofPediatricsTheJointCommission
Maintainanup-to-datepatientallergyprofile.
Confirmthevalidityofapatient’sweightformedicationsthataredosedbybodyweight(orBSAfor
medicationsdosedbyBSA).
Statespecificdosagestrengthsorformulation.
Donotuseabbreviationsfordrugnamesorpatientinstructions.
Avoidusingabbreviationsfordosageunits.
Useazerobeforeadecimalpoint.
Avoidazeroafteradecimalpoint.
Standardizeconcentrationsofhigh-alertmedications(i.e.,heparin,insulin,ornarcotics).
Utilizeoralsyringestoadministerliquidformulations.
Createdrugorderpathwaysforprotocols.
Collaborateandeducateallhealthcaremembersinvolvedwiththepatients’care.
Usetechnologysuchasautomateddispensingcabinets,smartinfusionpumps,barcoding.
BSA,bodysurfacearea.
CONCLUSION
Insummary,pediatric, pregnancy,andlactationpharmacotherapyposes a uniquechallenge.Thelackof medications approved by the FDA, insufficient literature resources, pharmacokinetic parameters comparedtoadultsandnon-pregnantwomen,individualdrugdosingcalculations,lackofdosageforms, andinappropriatedrugdeliverysystemsare a few examples(Levineetal., 2001).Althoughthehealth benefitsofbreast-feedingare established,there remainafewmedicationsthatareunsafetouseduring breast-feeding. As with medication use during pregnancy,the risk–benefit ratio needs to be assessed. Choice of the best medication totreatthematernal condition needstobe balanced against the risk of adverse effects to the infant. Furthermore, ensuring medication safety practices and legislations will allowforsafeandeffectivemedicationtherapytothisvulnerablemedicalpopulation.
CASESTUDY1
M.T.isan18-month-old,20-kgmalewhopresentstotheemergencydepartmentinstatusepilepticus, whichhascontinuedforapproximately20minutes.Hewasbroughttotheemergencydepartmentfrom asmallcommunityviaafamilyvehicle.Hehasnotreceivedanycareatthispoint.Thenursingstaffs haveattemptedseveralintravenouslineinsertionsbutwereunabletogainaccess.M.T.continuesto convulsewithoutinterruption(LearningObjective1). 
1.Discusstheadvantagesanddisadvantagesofthedifferentroutesofadministrationsofmedications
availabletotreatM.T.
Answer: Available options includerectal administration, which offers a relativelyfastonsetof actionbutwithsomevariabilityinabsorption.Alternatively,theintranasalrouteallowscomplete absorptionwithaquickonsetofaction.
2. Youprescribe arescuemedicationforM.T.'smom touseathomeintheeventM.T.hasanother
seizure. Discuss some advantages of utilizing the mucosal route of administration for at home administration.
Answer:Somemedicationshaveverygoodabsorptionandsystemiceffectwhenadministeredby nasalspray.Nasal(mucosal)administrationavoidsthetraumaofintravenouslineplacement.Nasal administrationofmedicationis typically less expensive than intravenous administration.This is alsoeasierforparentstouseratherthantherectalroute,whichcanbetraumatic.
3.Duringthefollow-upclinicvisitafter hishospital admission,MomexplainsthatM.T.has been
havingrashesalloverhisbody.Youevaluatetherashanddeterminethatitiseczemaandwantto prescribe a topical steroid. Discuss some considerations regarding the absorption of topical medicationsinpediatricpatients.
Answer: The absorption of compounds is inversely related to the thickness of the skin. The absorption of compounds is related to the hydration of the skin. Body surface area(BSA) is increased,relativetobodymass,intheinfantandyoungchildwhencomparedwitholderchildren andadults.Allthesefactorsleadtoahigheramountoftopicalmedicationbeingabsorbed.
CASESTUDY2
K.F.isa33-year-oldfemalewhohasarecenthistoryofdeepveinthrombosis(DVT)andreflux.She is on enoxaparin for treatment of her DVT, and she also occasionally takes famotidine for reflux. Duringhermostrecentvisittoherprimarymedicaldoctor,shefoundoutshewaspregnant.Duetoher recentDVThistoryandincreasedriskofDVTinpregnancy,herprimarymedicaldoctorwouldliketo continuetheenoxaparinthroughoutherentirepregnancy(LearningObjectives4and5). 
1.Whataresomepharmacokineticchangestoconsiderwiththeuseofenoxaparininpregnancy?
Answer:Evaluatethelabelingforpregnancy.Itdoesnotcrosstheplacenta,soitissafetousein
pregnancy. Enoxaparin has demonstrated increased clearance, so therapeutic monitoring may be recommendedtoensurecontinuedefficacy.
2.K.F.isnow4dayspostpartum, experiencingseverepainfromherC-sectionandunresponsiveto
acetaminophenandibuprofen.Shementionsthatshewould liketotrytramadol forstrongerpain control. She wishes to continue breast-feeding her baby. What are the recommendations for tramadol’scompatibilitywithbreast-feeding?
Answer:Tramadolisnotrecommendedwithbreast-feedingduetoriskofadverseeffectsinbreast­fedinfants,suchassleepinessandbreathingproblemsthatcouldresultindeath.
3.K.F.isnow2monthspostpartumandissuccessfullyexclusivelybreast-feedingherbaby.Sheplans
to continue breast-feeding but is diagnosed with acute bacterial sinusitis. She is prescribed amoxicillin and is concerned that this will negatively affect her baby. What are the recommendationstominimizetheconcentrationofamoxicillininherbreastmilk?
Answer:Determinethepeakofamoxicillininbreastmilkabout4to5 hoursafterthedose and schedule administration right after breast-feeding to minimize the dose to the infant by circumventingpeakbreastmilklevels.
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