{"id":5874,"date":"2025-10-29T00:00:00","date_gmt":"2025-10-28T22:00:00","guid":{"rendered":"https:\/\/elmeistrai.lt\/?p=5874"},"modified":"2025-10-07T13:50:12","modified_gmt":"2025-10-07T10:50:12","slug":"pulso-oksimetro-sviesos-absorbcija","status":"publish","type":"post","link":"https:\/\/elmeistrai.lt\/es\/pulso-oksimetro-sviesos-absorbcija\/","title":{"rendered":"Pulso oksimetro \u0161viesos absorbcija"},"content":{"rendered":"

Kaip ma\u017ea \u012f spaustuk\u0105 pana\u0161i d\u0117\u017eut\u0117 \u017eino, kiek deguonies tavo kraujyje?<\/h2>\n

Turb\u016bt daugelis esate mat\u0119 t\u0105 ma\u017e\u0105 plastikin\u012f prietais\u0105, kur\u012f gydytojai u\u017eseg\u0105 ant pir\u0161to ir po keli\u0173 sekund\u017ei\u0173 paskelbia, koks j\u016bs\u0173 deguonies kiekis kraujyje. Atrodo kaip magija, tiesa? Bet \u010dia ne jokia magija \u2013 tai labai protingas fizikos ir biologijos derinys. Pulso oksimetras veikia remdamasis vienu pagrindiniu principu: skirtingos med\u017eiagos sugeria \u0161vies\u0105 skirtingai. O kadangi kraujas su deguonimi ir be jo yra chemi\u0161kai skirtingas, jis ir \u0161vies\u0105 sugeria ne vienodai.<\/p>\n

Pats prietaisas atsirado ne vakar \u2013 pirmieji bandymai matuoti deguon\u012f kraujyje prasid\u0117jo dar XX am\u017eiaus viduryje, bet tikrai patog\u016bs ir tiksl\u016bs pulso oksimetrai atsirado tik devintajame de\u0161imtmetyje. Japon\u0173 in\u017einierius Takuo Aoyagi 1974 metais suk\u016br\u0117 pirm\u0105j\u012f veikiant\u012f prototip\u0105, o komercinis naudojimas prasid\u0117jo ma\u017edaug 1980-aisiais. Dabar \u0161ie prietaisai yra visur \u2013 ligonin\u0117se, greitosios pagalbos automobiliuose, net sportuojan\u010di\u0173 \u017emoni\u0173 laikrod\u017eiuose.<\/p>\n

\u0160viesos ir kraujo chemija<\/h2>\n

Kad suprastume, kaip veikia pulso oksimetras, reikia truput\u012f pasigilinti \u012f tai, kas vyksta m\u016bs\u0173 kraujyje. Raudonieji kraujo k\u016bneliai (eritrocitai) ne\u0161ioja hemoglobin\u0105 \u2013 baltym\u0105, kuris prisijungia prie deguonies molekuli\u0173 ir transportuoja jas po vis\u0105 k\u016bn\u0105. Hemoglobinas su deguonimi vadinamas oksihemoglobinu, o be deguonies \u2013 tiesiog deoksihemoglobinu arba redukuotu hemoglobinu.<\/p>\n

\u0160tai \u010dia ir prasideda \u012fdomyb\u0117s. Oksihemoglobinas yra ry\u0161kiai raudonas (tod\u0117l arterinis kraujas toks raudonas), o deoksihemoglobinas \u2013 tamsesnis, m\u0117lsvai raudonas (kaip veninis kraujas). Bet svarbiausia ne spalva, kuri\u0105 matome akimis, o tai, kaip \u0161ie du hemoglobino tipai elgiasi su \u0161viesa.<\/p>\n

Kai pro krauj\u0105 praleid\u017eiame \u0161vies\u0105, skirtingos bangos ilgio \u0161viesos spinduliai absorbuojami skirtingai. Oksihemoglobinas labiau sugeria infraraudon\u0105j\u0105 \u0161vies\u0105 (apie 940 nanometr\u0173 bangos ilgio), o deoksihemoglobinas \u2013 raudon\u0105j\u0105 \u0161vies\u0105 (apie 660 nanometr\u0173). \u0160is skirtumas ir yra visas pulso oksimetro veikimo pagrindas.<\/p>\n

Kaip prietaisas „mato” pro pir\u0161t\u0105<\/h2>\n

Pulso oksimetras turi dvi pagrindines dalis: \u0161viesos \u0161altinius ir \u0161viesos detektori\u0173. Paprastai jie i\u0161d\u0117styti prie\u0161ingose prietaiso pus\u0117se \u2013 viena pus\u0117 spaud\u017eia pir\u0161t\u0105 i\u0161 vir\u0161aus, kita i\u0161 apa\u010dios. Vir\u0161utin\u0117je dalyje yra du ma\u017ei LED \u0161viesos diodai: vienas skleid\u017eia raudon\u0105 \u0161vies\u0105 (660 nm), kitas \u2013 infraraudon\u0105j\u0105 (940 nm). Apatin\u0117je dalyje yra fotodetektorius \u2013 jautrus elementas, kuris „gaudo” \u0161vies\u0105, prasiskverbusi\u0105 pro j\u016bs\u0173 pir\u0161t\u0105.<\/p>\n

Kai u\u017esidedate prietais\u0105 ant pir\u0161to, LED diodai pradeda mirks\u0117ti (nors to da\u017eniausiai nematote, nes vyksta labai greitai). \u0160viesa keliauja pro od\u0105, raumenis, kaulus, venas ir, svarbiausia, pro arterijas. Dalis \u0161viesos absorbuojama, o dalis prasiskverbia iki kitos pus\u0117s ir patenka \u012f detektori\u0173.<\/p>\n

Dabar \u012fsivaizduokite: j\u016bs\u0173 \u0161irdis plaka, ir su kiekvienu d\u016b\u017eiu \u012f pir\u0161t\u0105 atpl\u016bsta \u0161vie\u017eio, deguonimi prisotinto kraujo banga. Tai rei\u0161kia, kad arterijose esan\u010dio kraujo kiekis nuolat kei\u010diasi \u2013 tai daugiau, tai ma\u017eiau. Kai arterija i\u0161siple\u010dia nuo kraujo bangos, pro pir\u0161t\u0105 praeina ma\u017eiau \u0161viesos. Kai arterija susitraukia, \u0161viesos praeina daugiau. \u0160is pulsacinis komponentas yra raktas \u012f matavim\u0105.<\/p>\n

Matematika u\u017e kulis\u0173<\/h2>\n

Pulso oksimetras nenagrin\u0117ja visos \u0161viesos, kuri absorbuojama j\u016bs\u0173 pirste. Kod\u0117l? Nes dauguma tos \u0161viesos absorbuojama audini\u0173, kurie nesikinta \u2013 odos, riebal\u0173, kaul\u0173, veninio kraujo. Tai vadinama pastoviu komponentu arba DC signalu. Prietais\u0105 domina tik kintantis komponentas \u2013 AC signalas, kuris atsiranda d\u0117l \u0161irdies plakimo ir arterinio kraujo pulso.<\/p>\n

\u0160tai kaip tai veikia: prietaisas i\u0161matuoja, kiek raudonos \u0161viesos absorbuojama pulso metu (AC) palyginti su visu absorbuotu kiekiu (DC), ir t\u0105 pat\u012f padaro su infraraudon\u0105ja \u0161viesa. Tada apskai\u010diuoja santyk\u012f:<\/p>\n

R = (ACraudona<\/sub> \/ DCraudona<\/sub>) \/ (ACinfraraudona<\/sub> \/ DCinfraraudona<\/sub>)<\/p>\n

\u0160is santykis R yra tiesiogiai susij\u0119s su deguonies prisotinimu kraujyje. Gamintoj\u0173 sukurti algoritmai, pagr\u012fsti empiriniais tyrimais su \u017emon\u0117mis, \u0161\u012f santyk\u012f paver\u010dia konkre\u010diu procentu \u2013 SpO\u2082 (arterinio kraujo deguonies prisotinimas).<\/p>\n

Pavyzd\u017eiui, jei R lygus ma\u017edaug 0.5, tai rei\u0161kia apie 100% deguonies prisotinim\u0105. Jei R art\u0117ja link 1.0, prisotinimas gali b\u016bti apie 85% ar ma\u017eiau. Normalus sveiko \u017emogaus SpO\u2082 yra 95-100%.<\/p>\n

Kod\u0117l kartais prietaisas „klysta”<\/h2>\n

Nors pulso oksimetrai yra gana tiksl\u016bs, jie n\u0117ra tobuli. Yra keletas dalyk\u0173, kurie gali suklaidinti matavim\u0105. Pirma, jei j\u016bs\u0173 rankos \u0161altos arba kraujo apytaka prasta, arterinis pulsas gali b\u016bti per silpnas, kad prietaisas j\u012f u\u017efiksuot\u0173. Tod\u0117l gydytojai kartais trina j\u016bs\u0173 pir\u0161t\u0105 prie\u0161 matavim\u0105 \u2013 kad pager\u0117t\u0173 kraujotaka.<\/p>\n

Antra, judesys. Jei judinate pir\u0161tu, kei\u010diasi \u0161viesos kelias per audinius, ir prietaisas gauna klaidinan\u010dius duomenis. Tod\u0117l matavimo metu reikia s\u0117d\u0117ti ramiai. Tre\u010dia, stipri aplinkos \u0161viesa gali trukdyti \u2013 nors modern\u016bs prietaisai turi filtrus, labai ry\u0161ki \u0161viesa vis tiek gali \u012fne\u0161ti paklaid\u0173.<\/p>\n

Dar viena \u012fdomi problema \u2013 nagu lakas. Ypa\u010d tams\u016bs ar m\u0117lyni atspalviai gali absorbuoti \u0161vies\u0105 ir i\u0161kraipyti rezultatus. Jei turite lakuotus nagus ir reikia tikslaus matavimo, geriau u\u017esid\u0117kite prietais\u0105 ant kito pir\u0161to arba ant ausies spenel\u0117s (kai kurie modeliai tai leid\u017eia).<\/p>\n

Taip pat verta \u017einoti, kad kai kuri\u0173 \u017emoni\u0173 odos pigmentacija gali tur\u0117ti \u012ftakos matavimams. Tyrimai rodo, kad labai tamsios odos \u017emon\u0117ms pulso oksimetrai kartais gali parodyti \u0161iek tiek auk\u0161tesnius rezultatus nei tikroji reik\u0161m\u0117, nors \u0161iuolaikiniai prietaisai \u0161i\u0105 problem\u0105 sprend\u017eia vis geriau.<\/p>\n

Nuo ligonin\u0117s iki sportini\u0173 laikrod\u017ei\u0173<\/h2>\n

Pulso oksimetrija revoliucionizavo medicin\u0105. Prie\u0161 \u0161iuos prietaisus, norint su\u017einoti deguonies kiek\u012f kraujyje, reik\u0117jo imti kraujo m\u0117gin\u012f i\u0161 arterijos \u2013 skausmingas ir komplikuotas procesas. Dabar per kelias sekundes galima gauti rezultat\u0105 be jokio \u012fki\u0161imosi \u012f k\u016bn\u0105.<\/p>\n

Ligonin\u0117se pulso oksimetrai naudojami visur \u2013 operacin\u0117se, intensyviosios terapijos skyriuose, gimdymo namuose. Jie padeda steb\u0117ti pacientus su kv\u0117pavimo problemomis, \u0161irdies ligomis, miego apn\u0117ja. COVID-19 pandemijos metu \u0161ie prietaisai tapo dar svarbesni, nes pad\u0117jo anksti aptikti „tyl\u0173j\u012f hipoksij\u0105” \u2013 b\u016bkl\u0119, kai deguonies lygis krinta, bet \u017emogus to dar nejau\u010dia.<\/p>\n

Bet pulso oksimetrija i\u0161\u0117jo ir u\u017e medicinos rib\u0173. Dabar \u0161i\u0105 technologij\u0105 rasite i\u0161maniuosiuose laikrod\u017eiuose ir fitneso sekikliuose. Kaln\u0173 kop\u0117jai naudoja juos steb\u0117ti, kaip j\u0173 organizmas prisitaiko prie auk\u0161\u010dio. Sportininkai tikrina atsigavim\u0105 po treniruot\u0117s. \u017dmon\u0117s su l\u0117tin\u0117mis plau\u010di\u0173 ligomis gali steb\u0117ti savo b\u016bkl\u0119 namuose.<\/p>\n

Tiesa, reikia suprasti, kad vartotoj\u0173 klas\u0117s prietaisai paprastai n\u0117ra tokie tiksl\u016bs kaip medicininiai. Jie tinka bendram steb\u0117jimui, bet rimtais atvejais reikia pasikliauti profesionalia \u012franga.<\/p>\n

Ateities perspektyvos ir nauji panaudojimai<\/h2>\n

Technologija nestovi vietoje. Mokslininkai dirba prie nauj\u0173 pulso oksimetrijos taikym\u0173. Pavyzd\u017eiui, bandoma naudoti daugiau \u0161viesos bang\u0173 ilgi\u0173, kad b\u016bt\u0173 galima matuoti ne tik deguonies prisotinim\u0105, bet ir kitus parametrus \u2013 pavyzd\u017eiui, methemoglobino ar karboksihemoglobino kiek\u012f (tai hemoglobino formos, kurios atsiranda apsinuodijus anglies monoksidu ar tam tikrais chemikalais).<\/p>\n

Kitas \u012fdomus kryptis \u2013 neinvazinis gliukoz\u0117s matavimas. Nors tai daug sud\u0117tingiau nei deguonies matavimas, principas pana\u0161us: skirtingos med\u017eiagos kraujyje skirtingai absorbuoja \u0161vies\u0105. Jei pavykt\u0173 sukurti patikim\u0105 prietais\u0105, diabetu sergantys \u017emon\u0117s gal\u0117t\u0173 pamir\u0161ti nuolatin\u012f pir\u0161t\u0173 durstym\u0105.<\/p>\n

Taip pat kuriami ma\u017eesni, lankstesni jutikliai, kuriuos b\u016bt\u0173 galima integruoti \u012f drabu\u017eius ar net laikinai priklijuoti prie odos kaip pleistrus. Tai b\u016bt\u0173 ypa\u010d naudinga stebint k\u016bdikius ar kritin\u0117s b\u016bkl\u0117s pacientus, kuriems reikia nuolatinio monitoringo, bet neprakti\u0161ka laikyti prietaiso ant pir\u0161to.<\/p>\n

Kai \u0161viesa pasako visk\u0105, ko reikia \u017einoti<\/h2>\n

Pulso oksimetras yra puikus pavyzdys, kaip paprasta fizikos id\u0117ja \u2013 \u0161viesos absorbcija \u2013 gali tapti gyvybes gelbstin\u010dia technologija. Nereikia joki\u0173 adat\u0173, jokio kraujo \u0117mimo, jokio laukimo laboratorijos rezultat\u0173. Tiesiog u\u017esidedate prietais\u0117l\u012f ant pir\u0161to, ir po keli\u0173 sekund\u017ei\u0173 \u017einote, kaip j\u016bs\u0173 organizmas susidoroja su deguonies tiekimu.<\/p>\n

\u017dinoma, kaip ir bet kuri technologija, pulso oksimetrija turi savo apribojim\u0173. Ji neatskleid\u017eia visos kraujo duj\u0173 analiz\u0117s, nepasakys, kod\u0117l deguonies lygis \u017eemas, jei jis \u017eemas. Bet kaip greitas, paprastas ir neinvazinis b\u016bdas steb\u0117ti vien\u0105 i\u0161 svarbiausi\u0173 gyvybini\u0173 rodikli\u0173 \u2013 tai ne\u012fkainojamas \u012frankis.<\/p>\n

Kai kit\u0105 kart\u0105 pamatysite t\u0105 ma\u017e\u0105 raudon\u0105 \u0161vyt\u0117jim\u0105 pro savo pir\u0161t\u0105, prisiminkite \u2013 tai ne \u0161iaip \u0161viesa. Tai kruop\u0161\u010diai parinktos bangos ilgio spinduliai, keliaujantys pro j\u016bs\u0173 audinius, s\u0105veikaujantys su hemoglobino molekul\u0117mis ir gr\u012f\u017etantys su informacija apie tai, kaip dirba j\u016bs\u0173 kv\u0117pavimo ir kraujotakos sistemos. Mokslas ir technologijos kartais tikrai atrodo kaip magija, tik geriau.<\/p>","protected":false},"excerpt":{"rendered":"

Kaip ma\u017ea \u012f spaustuk\u0105 pana\u0161i d\u0117\u017eut\u0117 \u017eino, kiek deguonies tavo kraujyje? Turb\u016bt daugelis esate mat\u0119 t\u0105 ma\u017e\u0105 plastikin\u012f prietais\u0105, kur\u012f…<\/p>","protected":false},"author":1,"featured_media":5873,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-5874","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologijos","wpcat-1-id"],"yoast_head":"\nPulso oksimetro \u0161viesos absorbcija<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/elmeistrai.lt\/es\/pulso-oksimetro-sviesos-absorbcija\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pulso oksimetro \u0161viesos absorbcija\" \/>\n<meta property=\"og:description\" content=\"Kaip ma\u017ea \u012f spaustuk\u0105 pana\u0161i d\u0117\u017eut\u0117 \u017eino, kiek deguonies tavo kraujyje? 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