Causes
VitaminAdeficiencycausedbyvariousreasons.Forexample,chronicdiarrhea,liverandgallbladderdisease,albuminreductionisnotenoughtotransportvitaminA,andseverewastingdiseasecausesexcessiveconsumptionofvitaminA,whichcanleadtovitaminAdeficiencysymptoms.VitaminA0.3μgisequivalentto1internationalunit(U).Theminimumdailyrequirementforadultsis20U/kgor40Uβ-carotene.Infact,thedailysupplyforadultsshouldnotbelessthan5000U.
Clinicalmanifestations
Patientsshouldeatmoremilk,eggyolks,livers,andcarrotsrichinvegetarianfoodstoactivelytreatthechronicorunderlyingdiseasesdiscovered.OralvitaminAis50,000U/d,andseverecasesare100,000to200,000U/d.Itwillbereducedlater.Long-termlarge-scaleusecancausevitaminAhypertrophy.Ifitiscombinedwithothervitamindeficiencies,itshouldbesupplementedaccordingly.Payattentiontoprotecttheskinlesionsoftheeyesandusecodliveroilointment,10%ureacream,tretinoincream,etc.forexternaluse.
TraditionalChineseMedicineMethod
Therapeuticmethod:invigoratethespleenandstomach,nourishbloodandmoisturizetheskin.
Prescriptions:Atractylodesmacrocephala10g,Poriacocos10g,Tangerinepeel10g,Lentils10gAngelica10g,Redpeonyroot10g,Muxiang10g,Stir-friedrice30g,Stir-friedGorgon15g,Salvia15g,Stir-friedCitrusaurantium10g,SandRen10g.ItcanbeappliedtoBazhenPills,GinsengJianpiPills,JiaweiBaohePills,etc.
Prevention
ChronicwastingdiseasesandexcessivedrinkingrestrictionsshouldpayattentiontosupplementingvitaminA.
Pathogenesis
VitaminAconstitutestheretinalphotosensitivepigmentrhodopsinandplaysanimportantroleinnightvisionandparticipatesincarbohydratemetabolismandglycoproteinsynthesistomaintainthegrowthanddifferentiationofepithelialtissues.Whenitisdeficient,thelevelsofretinalrhodopsinandopsindecrease,leadingtonightblindness.Scalymetaplasiaofthemucousmembranesoftheeyes,upperrespiratorytractandgastrointestinaltract,causingmucosalkeratosisandhyperkeratosis,resultingindryeye,dryskindesquamation,follicularkeratosis,papulesandaseriesofeyeandskinsymptoms.