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Ординатура / Хирургия / Библиотека им академика М.И. Перельмана / Книга_6022_Библиотеки_им_академика_М_И_Перельмана

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The global incidence rate of traumatic SCI was estimated at 23 cases per millionoratotalofabout179,000casesin2007(82).TheincidencerateofSCI intheUnitedStates,documentedinTable4.1,isclosetowhatwasreportedin Canada(41casesor53casesincludingpre-hospitaldeathspermillionin2010) (72) but is much higher than the rate in other global regions defined by the WorldHealthOrganization:Caribbean(19permillion),LatinAmerica-Andean (19 per million), Latin America-Central (24 per million), Latin America­Southern(25permillion),WesternEurope(16permillion),Australia(15–32per million)(84), Asia-Central(25permillion), Asia-South (21 per million),Sub­Saharan Africa-Central (29 per million), and Sub-Saharan Africa-East (21 per million)(82).Itisdifficultto comparedatafromdifferentcountriesduetothe differences in reporting procedures, case definition, and completeness of case ascertainment.Nevertheless, the international variations in SCI incidencerates areanticipated because of thedifferencesin theriskof SCI by theunderlying populationcharacteristics(age,sex,andrace)andexternalfactors(urbanization, roadconditions,andpolicymeasuressuchasguncontrolandimplementationof seatbeltrestraintlaws,etc.).Incountrieswithahighpre-hospitaldeathrate,the exclusion of those who die at the scene of the accident might greatly underestimatetheSCIincidencerateanditsimpact(85).
Regardingthedemographicprofile,thehigherriskofSCIformalesandthe bimodal age distribution are nearly consistent throughout the world, with a higherriskinpersonsaged15to 29and≥65years.Motorvehiclecrashesand fallsarethemostcommoncausesofinjury.Inthedevelopedcountries,asnoted inthe UnitedStates, thepercentage ofinjuriesdue tomotor vehiclecrashes is decreasing or remains stable, while the percentage as a result of low falls is increasingwithagingpopulations(82).Inthedevelopingcountries,theetiology profile is different.The percentage of injuries due to motorvehicle crashesis increasingasaresultofurbanization,increaseduseofmotorizedtransport,poor infrastructure (such as road conditions), and regulatory challenges (80). Low fallsarerelativelycommoninyoungpeoplewhilecarryingheavyloadsonthe head in some developing countries (82). In most countries, except the United States,Brazil,andregionsofconflictsorwars,thepercentageofSCIduetoacts ofviolenceisloworzero(82)
DevelopingcountriesalsodifferfromtheUnitedStates,andotherdeveloped countries in that complete injuries are slightly more commonthan incomplete injuries (56.5% vs. 43.0%), and paraplegia is more common than tetraplegia (58.7%vs.40.6%)inthedevelopingcountries(80).MortalityafterSCIhasalso
beendocumentedtovarysubstantiallybyregionandcountryincomelevels(62). The in-hospital mortality rate is nearly three times higher in low-income countries than in high-income countries, being 24.1%, 7.6%, and 7.0% in the regionsofAfrica,theAmericas,andEurope,respectively.Developingcountries alsohavehigher1-yearmortalityrates,particularlyintheSub-SaharanAfrica­Westregion(29%)(82).
The limited data on prevalence estimates indicate that the prevalence rate worldwide ranges from 236 cases per million in India in 1986 to 1,298 per million in Canada in 2010(79,82). The prevalence rates are 490 to 886 per million in Australia, 236 to 464 per million in the regions of Asia-South and Asia-Southeast,and280to316permillioninWesternEurope.SCIprevalenceis expectedtobehigherintheUnitedStatesthaninothercountriesbecauseofthe relativelyhighincidenceand/orgoodsurvivalratesafterSCI.However,because of the differences in research methodology,the comparison between estimates andstudiesischallenging,anditisdifficulttodrawavalidconclusion.
COST
One of the most frequent inquiries that the National SCI Statistical Center receivesfromthepublicconcernsthecostsofcareforsomeonewithSCI.For example,familieswant to ensure adequate resources are set aside for care for theirlovedones,lawyersseekreasonablecompensationfortheirinjuredclients, and the media searches data for a report of financial burdens to the society. Knowledgeoftheeconomicimpacttosocietyisalsoimportantforthepurpose of resource allocation. Finding a perfect answer to this cost question is challenginginpartbecausethecostsofcarevarysubstantiallybythecommunity inwhichtheindividualresides,thecharacteristicsofthepersonwithSCI(age, level and completeness of injury, health status), and the actual needs of the individual.
Comparing cost studies and appropriately interpreting the results is also difficult. First, it is critical to distinguish between charges and costs. For example, hospital charges reflect the hospital’s retail price for covered and noncovered services, while the costs reflect the amount paid by the payer. Chargesandcosts donot takeinto accountthe needsof personswith SCI,but ratherarebasedongoodsandservicesactuallyreceived,andthusunderestimate thecostsofoptimalcare.Second,itis importanttoknow whether the studies captureonlytheincrementalcharges,itemsthataredirectlyrelatedtoSCI,such
thatothermedicalexpensesthatwouldbeencounteredintheabsenceofSCIare not included. Lastly,the indirectand intangible costs (e.g.,loss of wages and productivity, psychological stress,andcaregiver’sburden, etc.) arenotusually includedintheestimatesofeconomicburden.
UsingthelimitedliteratureavailableanddatafromtheNSCID,thissection willtrytoaddressthefollowingconcernsaboutthedirectcostsofSCI:1)costs toanindividualonanannualbasis,2)coststoanindividualovertheirlifetime,
3)coststosocietyofnewcasesofSCIarisinginaparticularyear,and4)coststo society of all persons with SCI in a particular year. These estimates are not perfectbutprovideageneralguideforlifecareplanningandalsoimproveour understandingofthefinancialimplicationsofpreventionofSCIandassociated complications.AbetterunderstandingofthetotalcostsofSCIandthecostsof componentsthatmakeupthistotalwillimprovethechancesofminimizingthese costsandimprovingthequalityoflifeofindividualswithSCI.
Thelateststudiesthatcomprehensivelyandgeographicallycoverallservices andactualchargesincurredbypersonswithSCIofawiderangeofdemographic and clinical characteristics in the United States were conducted in the early 1990s(86–88).OneofthethreestudieswasrecentlyupdatedwithNSCIDdata obtainedduring2000to2006,includingdataregardingacuteandrehabilitation hospital charges, rehospitalization, and nursing home and attendant care (89). However,the NSCID does not contain newinformationon the following cost categoriesincludedintheoriginalstudy:emergencymedicalservices,outpatient services and physician fees, medications, supplies, vocational rehabilitation, environmentalmodifications,durableequipment,andothermiscellaneouscosts. Therefore,thecostsforthesecategoriesthatwereestimatedintheoriginalstudy in1992U.S.dollars(USD) wereadjustedforinflationto 2009USD usingthe consumerpriceindexforallitems.Table4.6summarizesthefindingsofaverage first-yearandannualexpensesthereafterin2017USDforpersonswithSCIover theirremaininglifetimebyneurologiclevelandextentofinjury.
Theaveragefirst-yearchargeis$604,866,andtheaverageannualchargefor theremainderoflifeisestimatedat$92,228butvariesconsiderablybyleveland completenessofinjury.Duringthefirstyear,mostchargesresultfrominpatient acute care and rehabilitation. Significant charges are also often incurred for attendantcare,durableequipment,andenvironmentalmodifications,particularly forpersonswithcervicalinjuriesduringthefirstyearafterdischargefromacute hospital care. Recurrent annual charges are mostly for attendant care and rehospitalizations.Adetailedcategorizationofthesechargeshasbeen reported
previously(89).
Giventheadvancesinmedicaltechnologyandimprovedacutesurvivalrates, thedirectcostsofSCIarelikelytoincreaseatarapidpace,andasaresult,these estimates(Table 4.6) derived from data in the early 1990s and updated in the early2000sarelikelytobeconservative.Forexample,arecentpopulation-based study conducted in South Carolina noted a consistent increase in acute care chargeovera15-yearperiod,withoutacorrespondingincreaseinthelengthof stay(23).Theacutecarechargeincreasedfromapproximately$50,000in1998 to$225,000in2012,risingfasterthaninflation.Asimilarupwardtrendinacute careandrehabilitationchargesisalsonotedinpreviousNSCIDstudies(90).
Arecentreviewofthehealthcarecostsforthemanagementofveteranswith traumaticand nontraumaticSCIindicates that theaverage annual costsranged from$30,770to$62,563in 2016 USD (or $31,426 to $63,896 in 2017 USD) (91), generally lower than the costs of caring for civilians with SCI. These studies,however,werelimitedtothecostsofservicesprovidedbytheVeterans Administrationhealthcaresystemandthusdidnotincludethecostofattendant care and other services provided byother providers. Conversely, thesestudies didnotseemtoincludeinthedenominatorindividualswhowerehealthyanddid not receive any services, and therefore, possibly overstate average costs per person.
Thelifetimedirectcosts,definedastotaldirectchargesovertheremaining
life,canbedeterminedbythedirectchargeseveryyearandprobabilitiesthatan individualwillstillbealiveeachyeartoincurthosecharges.Theseestimatesare usuallycalculatedasthepresentvalueoffuturecosts,whichcanbeinterpreted asfunds setaside atpresent inescrowfor usethroughout thelifetime. Asone dollartodayisworthmorethan1dollarinthefutureduetotheinterestearned between now and then, the discount rate reflects the real rate of return on investments over and above inflation. The estimated present value of average lifetimedirect costs of SCI in 2017USDusinga real discount rate of 2% for personsinjuredatage25and50,byneurologiclevelandextentofinjury,also appearsinTable4.6.Atage25,thelifetimedirectcostofcareisestimatedtobe $4,891,398forpersonswithaC1–C4AISA,B,orCinjuryand$1,634,139for personswithanAISDinjuryatanylevel(92).Estimatesoflifetimecostsatage 50arelowerbecauseofthelowerlifeexpectancyforthesepersons.
Because of the assumptionthat the annual recurrent chargesafter the first post-injuryyear are constant over time in calculating the lifetimecosts (Table
4.6),therealcostsmighthavebeenunderestimated,asthereisevidencethatthe
directcostsincreasesubstantiallyduringthelastfewyearsoflifeinpersonswith SCI.InastudyoncostsofSCIcarein theVeteransAdministration healthcare system,theaveragecost ofservicesprovidedinthelastyear oflife,excluding pharmacycosts,is$61,900in2001USD(or$85,674in2017USD),whereasthe averagecost is$24,900 (or$34,464 in2017USD) inthe previousyear oflife (93).
Dataderivedfromthe NationwideEmergencyDepartmentSampleindicate anaverage$1.6billionin2009USD(or$1.8billionin2017USD)wascharged annually for treatment of acute SCI for all emergency department visits and subsequent inpatient encounters in 2007 to 2009 (21). Another study of the NationalInpatientSample reported a total of 11,848weighted hospitalizations occurrednationallywithaprimarydiagnosisofSCIin 2009andestimated the totalnationalhospitalchargesrelatedtoSCI,acute,andchronic,at$1.7billion in 2009 USD (or $1.9 billion in 2017 USD) (94). The total number of hospitalizations related to SCI seems low, given the knowledge of the annual SCIincidenceandthefrequencyofrehospitalizationafterSCI(~30%).Thus,the nationalhospitalization burden isprobablyunderstated. Totalannualaggregate directcosts,includinghospitalizationcharges,attendantcare,andotherservices, estimatedby theNSCID samplein the1990s,is$7.7billion in1995 USD(or $12.4billionin2017USD)(95).
CONCLUSION
With the increasing availability of nationwide administrative data sets and advancedanalyticmethodology,ourunderstandingof theepidemiology ofSCI intheUnitedStateshasgreatlyimprovedoverthelastfewyears,particularlyin theincidencerateandhospitalcharges.ThesupportfromtheNationalInstitute on Disability, Independent Living, and Rehabilitation Research allows the NSCID to continue updating the trends in demographic, injury etiology, and clinicalprofilesofpeoplewithSCIreportedsincetheearly1970s.Thankstothe recentinternationaleffortsinassemblingandsummarizingdata,muchisknown aboutthedescriptiveworldwideepidemiologyofSCI.Currenteffortsdirectedto standardize data collection (96) make it possible to combine different data sourcesinwaysthattakefulladvantageoftheuniquestrengthsofeachavailable databasetoaddresscommonquestionsacrosstheglobe,suchasthedevelopment ofcost-effectiveprimarypreventionprograms.
Substantial variations of specific etiologies of injury by age, sex, race/ethnicity, day, and month highlight the need for prevention strategies tailored to the targeted population and major causes of SCI to increase the impactonreducing the incidence of SCI. In light of the aging population and fallsasthemostcommoncausesofSCIintheelderlyintheUnitedStatesand otherdeveloped countries, there is an urgentneed for effectivefallprevention programstoreduceSCIinthisexpandingpopulation.Educationalmaterialsthat portraySCIcases asmen intheirteensandearly20salso needtobeupdated. Demographic and injury trends in new SCIs call for greater involvement of experts in gerontology and geriatrics and intercultural competency of clinical teamsduringacuteandrehabilitationcareforSCI.
A strong relationship between etiologies and level/completeness of injury alsoprovidesinsightregardingthemechanismsofinjury,whichwillaidinthe design of equipment and other safety measures for reducing the incidence of SCI. In addition to personal characteristics and mechanical causes, specific behavioralandenvironmentalfactorsneedtobeconsideredinthedevelopment and coordination of prevention efforts, for instance alcohol use, seat belt use, distracteddriving,roadconditions,andlawsandlawenforcement.
Future epidemiology efforts should focus on developing a more accurate profileofpersonswithSCIwhoarealivetodayaswellasthedirectandindirect costsofSCI.Thiswillallowclinicalandotherlifelongsupportiveservicestobe betterorganizedandcoordinated.
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