Plasentan\u0131n kan dola\u015f\u0131m\u0131n\u0131n de\u011ferlendirmesi, plasentadaki dola\u015f\u0131m yetersizli\u011fini ortaya koyar. Plasentada dola\u015f\u0131m yetersizli\u011fi olmas\u0131 da, gebelik zehirlenmesi (preeklampsi), rahim i\u00e7i geli\u015fme gerili\u011fi ve bebe\u011fin do\u011fum \u00f6ncesi \u00f6l\u00fcm\u00fc gibi sonu\u00e7lara neden olabilir.Fetusun kan dola\u015f\u0131m\u0131 da doppler ile de\u011ferlendirilebilir. Kan dola\u015f\u0131m\u0131ndaki aksakl\u0131klar, bebe\u011fin ba\u015fta beslenme olmak \u00fczere genetik ve di\u011fer bir\u00e7ok hastal\u0131\u011f\u0131 hakk\u0131nda bilgi sahibi olmam\u0131za yard\u0131mc\u0131 olur.Renkli doppler haritalamas\u0131 ile bebekteki kan ak\u0131mlar\u0131 ak\u0131m y\u00f6n\u00fc farkl\u0131 renklerde g\u00f6sterilerek resim haline getirilebilir.<\/p>\n
Doppler ultrason, bebe\u011fin kalbinin de\u011ferlendirilmesinde ve bebekteki kans\u0131zl\u0131\u011f\u0131 saptamada yeri doldurulmaz bir y\u00f6ntemdir.<\/p>\n
Daha yeni bir geli\u015fme ise g\u00fc\u00e7 doppleridir. Bu y\u00f6ntemde daha k\u00fc\u00e7\u00fck damarlar\u0131 da g\u00f6r\u00fcnt\u00fclemek m\u00fcmk\u00fcn hale gelir. Bu y\u00f6ntemde normal ultrason g\u00f6r\u00fcnt\u00fcs\u00fcn\u00fcn \u00fczerine organ\u0131n kanlanmas\u0131 renkli olarak oturtulmu\u015ftur. Plasenta dola\u015f\u0131m\u0131n\u0131n g\u00f6sterilmesi i\u00e7in iyi bir y\u00f6ntemdir.<\/p>\n
Doppler ultrason vajinal yoldan veya kar\u0131ndan yap\u0131labilir.<\/p>\n
T\u00fcm modern ultrason cihazlar\u0131nda doppler \u00f6zelli\u011fi bulunmaktad\u0131r. Bu y\u00fczden doppler uygulamas\u0131 i\u00e7in ba\u015fka bir ultrason aletinin kullan\u0131lmas\u0131 gerekmez.<\/p>\n
- \n
![\"Doppler](\"http:\/\/izmirkarsiyakakadindogummerkezi.com\/wp-content\/uploads\/2014\/05\/eu_doppl.jpg\")
<\/dt>\n- D\u0131\u015f gebeli\u011fin doppler ile g\u00f6r\u00fcn\u00fcm\u00fc<\/dd>\n<\/dl>\n<\/div>\n
Renkli Doppler damarlar i\u00e7erisindeki kan ak\u0131m\u0131n\u0131n y\u00f6n\u00fcn\u00fc belirlemek amac\u0131yla yap\u0131lan renk kodlamas\u0131n\u0131 i\u00e7eren dinamik ultrasonografik inceleme y\u00f6nteminin ad\u0131d\u0131r. Renkli Doppler fetal ekokardiografide, gebelik zehirlenmesi (preeklampsi) rahim i\u00e7i gerili\u011fi (IUGR) olgular\u0131nda risk tayini ve y\u00f6netiminde, bebek kordonu ve plasentaya ait anomalilerin tan\u0131mlanmas\u0131nda, anne ve\u00a0 bebe\u011fe ait t\u00fcm\u00f6ral kitlelerin tan\u0131s\u0131nda, bebe\u011fin d\u00fc\u015f\u00fck kan de\u011ferlerinin (anemi) tan\u0131 ve y\u00f6netiminde kullan\u0131l\u0131r.<\/p>\n
Doppler, kan dola\u015f\u0131m\u0131n\u0131n de\u011ferlendirilmesi i\u00e7in kullan\u0131lan bir y\u00f6ntemdir. Doppler y\u00f6ntemi ile uzun y\u0131llard\u0131r bebeklerin kalp at\u0131\u015flar\u0131n\u0131 dinleyen cihazlar kullan\u0131lmakta. Bu cihazlar dapton ad\u0131 ile biliniyor. Son y\u0131llarda doppler ultrason teknolojisi \u00e7ok h\u0131zl\u0131 geli\u015fmi\u015ftir. Bu geli\u015fim ile gebelikte daha fazla alanda doppler kullan\u0131labilir hale geldi. \u00d6zellikle bebe\u011fin yeterli beslendi\u011finin saptanmas\u0131 ile geli\u015fme geriliklerinin de\u011ferlendirilmesi ve kalp hastal\u0131klar\u0131n\u0131n tan\u0131s\u0131nda doppler kullan\u0131m\u0131 giderek artmaktad\u0131r.<\/p>\n
Doppler ultrasonun en iyi kullan\u0131ld\u0131\u011f\u0131 alan bebe\u011fin kalp at\u0131mlar\u0131 ve de\u011fi\u015fik damarlardaki kan ak\u0131m\u0131n\u0131n de\u011ferlendirilmesidir. Gebelik s\u0131ras\u0131nda \u00f6l\u00e7\u00fclmesi yararl\u0131 olabilecek kan dola\u015f\u0131mlar\u0131 aras\u0131nda plasenta, rahim ve bebe\u011fin kan dola\u015f\u0131mlar\u0131 bulunur.<\/p>\n
Farkl\u0131 kan damarlar\u0131n\u0131n farkl\u0131 kan ak\u0131m h\u0131zlar\u0131 ve \u015fekilleri vard\u0131r. Doppler ultrason ile kan damarlar\u0131n\u0131n kan ak\u0131m h\u0131zlar ve \u015fekilleri de\u011ferlendirilebilir. Rahim kan ak\u0131m\u0131n\u0131n azalmas\u0131, bebe\u011fin geli\u015fim bozukluklar\u0131na neden olur. Kan ak\u0131m h\u0131zlar\u0131ndaki farkl\u0131l\u0131klar geli\u015fme gerili\u011finin ne kadar ciddi oldu\u011funu g\u00f6sterir.<\/p>\n
Tekrarlanabilir ve g\u00fcvenilir sonu\u00e7lar elde etmek i\u00e7in Doppler muayenesinde t\u00fcm damarlara yakla\u015f\u0131m \u015f\u00f6yledir:<\/p>\n
- \n
- \u0130lgilenilen alana zoom yap\u0131n<\/li>\n
- Renkli Doppler uygulay\u0131n\n
- \n
- Renk kutucu\u011funu daralt\u0131n<\/li>\n
- Velosite skalas\u0131n\u0131 ayarlay\u0131n<\/li>\n<\/ul>\n<\/li>\n
- Puls wave aral\u0131\u011f\u0131n\u0131 uygulay\u0131n\n
- \n
- Aral\u0131\u011f\u0131 damar\u0131 saracak \u015fekilde ayarlay\u0131n<\/li>\n
- Velosite skalas\u0131n\u0131 ayarlay\u0131n<\/li>\n
- Filtreyi ayarlay\u0131n<\/li>\n<\/ul>\n<\/li>\n
- Fetusun v\u00fccut veya solunum hareketi yokken en az \u00fc\u00e7 tane art arda uniform dalga kaydedin.<\/li>\n<\/ul>\n
Ak\u0131m direncini saptama<\/p>\n
- \n
- Dalga \u015feklinin ba\u015flang\u0131c\u0131ndan bir sonrakinin ba\u015flang\u0131c\u0131na kadar kesintisiz bir trase elde etmek \u00f6nemlidir. Arterlerde otomatik trase izleme program\u0131 kullan\u0131labilirse de venlerde trifazik dalga \u015fekli uygun \u015fekilde analiz edilemedi\u011finden\u00a0trase elle i\u015faretlenir.<\/li>\n
- Hem arter, hem de venler i\u00e7in sonu\u00e7lar\u0131 de\u011ferlendirmede pulsatilite indeksinin kullan\u0131m\u0131 \u00f6nerilir.<\/li>\n<\/ul>\n
Fetal anemi gibi hiperdinamik dola\u015f\u0131m de\u011ferlendirilirken\u00a0Doppler\u00a0dalgas\u0131n\u0131n en y\u00fcksek noktas\u0131 olan\u00a0pik sistolik velosite (PSV) al\u0131nmal\u0131d\u0131r.<\/p>\n
Arteriyel Doppler<\/p>\n
Sistolik ve diyastolik velosite aras\u0131ndaki ili\u015fki ve dalga \u015fekli karakteristikleri \u015funlara ba\u011fl\u0131d\u0131r:<\/p>\n
- \n
- Giri\u015f bas\u0131nc\u0131<\/li>\n
- Damar direnci\n
- \n
- Damar tonusunda de\u011fi\u015fiklikler\n
- \n
- Orta serebral, renal, hepatik, adrenal, koroner ve splenik arterlerde otorg\u00fclasyon<\/li>\n
- \u0130ndometazin verilince duktus arteriozustaki vazokonstr\u00fcksiyon<\/li>\n<\/ul>\n<\/li>\n
- Uterin ve umblikal arterlerde yetersiz plasentasyona ba\u011fl\u0131 yap\u0131sal vask\u00fcler de\u011fi\u015fiklikler.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
Ven\u00f6z Doppler<\/p>\n
\u00dczerinde en \u00e7ok klinik \u00e7al\u0131\u015fma yap\u0131lan venler, duktus venozus, vena kava inferior ve umblikal vendir.<\/p>\n
Ven\u00f6z Doppler, venin akt\u0131\u011f\u0131 kalbin fonkiyonu hakk\u0131nda bilgi verir<\/p>\n
- \n
- Komplians<\/li>\n
- Gev\u015feme<\/li>\n
- Kas\u0131labilirlik<\/li>\n
- Afterload<\/li>\n<\/ul>\n
T\u00fcm damarlar, ayn\u0131 dalga \u015fekillerini g\u00f6sterir<\/p>\n
- \n
- Sistolik pik<\/li>\n
- Diyastolik pik<\/li>\n
- Atrial sistol<\/li>\n<\/ul>\n
Plasental Doppler<\/p>\n
Plasenta, iki kompartman aras\u0131nda besin, s\u0131v\u0131 ve gaz al\u0131\u015fveri\u015fi sa\u011flayan bir organd\u0131r:<\/p>\n
- \n
- Maternal kompartman, uterin arter Doppleri\u00a0ile de\u011ferlendirilir<\/li>\n
- Fetal kompartman, umblikal arter Doppleri ile de\u011ferlendirilir<\/li>\n<\/ul>\n
Gebeli\u011fin ilerlemesine paralel olarak damarsal yap\u0131lar\u0131n fizyolojik mat\u00fcrasyonunu g\u00f6steren belirte\u00e7ler<\/p>\n
- \n
- Uterin arterler: Erken diyastolik \u00e7enti\u011fin ortadan kalkmas\u0131 ile artm\u0131\u015f diyastolik ak\u0131m<\/li>\n
- Umblikal arterler: Diyastol sonu ak\u0131m\u0131n g\u00f6zlenmesi<\/li>\n
- Her iki damarda pulsatilite indeksinin d\u00fc\u015fmesi<\/li>\n<\/ul>\n
Anormal plasentasyon durumunda<\/p>\n
- \n
- \u00a0 Maternal spiral arterlerin yetersiz trofoblastik invazyonundan kaynaklanan y\u00fcksek uterin arter pulsatilite indeksi ve uterin arter \u00e7enti\u011finin kaybolmamas\u0131<\/li>\n
- \u00a0 Vill\u00f6z vask\u00fcler a\u011fac\u0131n anomalisinden kaynaklanan umblikal arterin anormal dalga \u015fekli yetersiz vask\u00fclat\u00fcr\u00fcn \u015fiddetine ba\u011fl\u0131d\u0131r:\n
- \n
- %30 yetersizlik y\u00fcksek pulsatilite indeksi ile sonu\u00e7lan\u0131r<\/li>\n
- %50 yetersizlik diyastol sonu ak\u0131m kayb\u0131 ile sonu\u00e7lan\u0131r<\/li>\n
- %70 yetersizlik diyastol sonu ters ak\u0131m ile sonu\u00e7lan\u0131r<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
Hipoksemi\/asidemi riski, umblikal arterdediyastol sonu ak\u0131m azalmas\u0131 ile orant\u0131l\u0131d\u0131r.<\/p>\n
Fet\u00fcste dola\u015f\u0131m<\/p>\n
Paralel dola\u015f\u0131mda tercihli ak\u0131mlar<\/p>\n
- \n
- Duktus venozus, karaci\u011fer ve kalp aras\u0131nda besin ak\u0131\u015f\u0131n\u0131 belirler<\/li>\n
- Foramen ovale, sa\u011f ve sol kalp aras\u0131nda dengeyi belirler<\/li>\n
- Duktus arteriozus beyin ve v\u00fccut aras\u0131nda besin dengesini belirler<\/li>\n<\/ul>\n
Duktus venozus \u015fant\u0131n\u0131n de\u011fi\u015fikli\u011fi t\u00fcm ak\u0131m dengesini etkiler.<\/p>\n
Arteriyal direnci de\u011fi\u015fiklikleri kalp, beyin ve v\u00fccut dengesini etkiler.<\/p>\n
Umblikal ven<\/p>\n
Umblikal\u00a0ven, fetal abdomende veya umblikal kord i\u00e7inde muayene edilmelidir. Ak\u0131m 12 haftadan itibaren fetuslerin %90’\u0131nda sabittir. Pulsasyon, fet\u00fcslar\u0131n %10’unda g\u00f6r\u00fcl\u00fcr ve \u00fc\u00e7 tip olabilir<\/p>\n
- \n
- Monofazik<\/li>\n
- Bifazik<\/li>\n
- Trifazik<\/li>\n<\/ul>\n
Monofazik pulsasyonlar, sentral venlerin anormalli\u011fi ile ilgili bir durumdur. Multifazik pulsasyonlar, anormal y\u00fcksek ven\u00f6z bas\u0131nc\u0131 g\u00f6sterir.<\/p>\n
Umblikal ven\u00f6z Doppler’in klinik uygulamas\u0131<\/p>\n
- \n
- Fetal b\u00fcy\u00fcme k\u0131s\u0131tl\u0131l\u0131\u011f\u0131<\/li>\n
- \u0130kiz ikize transf\u00fczyon sendromu<\/li>\n
- Hidrops fetalis<\/li>\n<\/ul>\n
Duktus venozus<\/p>\n
Duktus venozus, karaci\u011ferden kalbe besin ak\u0131\u015f\u0131n\u0131 d\u00fczenleyen birincil \u015fantt\u0131r. Damar, sagittal veya abdominal aksial planda g\u00f6zlemlenebilir.<\/p>\n
\n- \n
![\"Duktus](\"http:\/\/izmirkarsiyakakadindogummerkezi.com\/wp-content\/uploads\/2014\/05\/duktus.jpg\")
<\/dt>\n- Duktus venozus (g\u00f6bek toplar damar\u0131n\u0131n kalbe d\u00f6k\u00fcld\u00fc\u011f\u00fc kanal) doppler g\u00f6r\u00fcn\u00fcm\u00fc<\/dd>\n<\/dl>\n<\/div>\n
- \n
- Normal fet\u00fcste a dalgas\u0131 ilk trimestrden itibaren pozitiftir ve venin pulsatilite indeksi gebelik ilerledik\u00e7e d\u00fc\u015fer.<\/li>\n
- Y\u00fcksek pulsatilite indeksi veya a dalgas\u0131 yoklu\u011fu ya da ters olmas\u0131 \u015fu durumlarda saptan\u0131r\n
- \n
- An\u00f6ploidik,<\/li>\n
- Kardiyak defektli,<\/li>\n
- B\u00fcy\u00fcme k\u0131s\u0131tl\u0131l\u0131\u011f\u0131 olan<\/li>\n
- \u0130kiz ikize transf\u00fczyon sendromunda hem al\u0131c\u0131, hem de verici bebekte<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
Orta serebral arter<\/p>\n
Orta serebral arter (MCA), kafatas\u0131 taban\u0131nda yer alan Willis poligonunun bir dal\u0131d\u0131r. Aksial al\u0131nan kesitte renkli Doppler ile Willis poligonu ve MCA\u00a0g\u00f6r\u00fcl\u00fcr. Puls wave Doppler gatei MCAnin proksimal 1\/3’\u00fcne yerle\u015ftirilir. \u0130nsonasyon a\u00e7\u0131s\u0131 0 derece olmal\u0131d\u0131r. Gereksiz bas\u0131n\u00e7 yap\u0131lmamal\u0131d\u0131r. Fetusun kafas\u0131na bas\u0131n\u00e7 yap\u0131lmas\u0131 pik sistolik ak\u0131m (PSV)\u00a0ve pulsatilite indeksini (PI)\u00a0art\u0131r\u0131r.<\/p>\n
- \n
- Normal gebeliklerde gebelik ilerledik\u00e7e PSV artar, PI azal\u0131r.<\/li>\n
- D\u00fc\u015f\u00fck PI, fetuste hipoksemi ve hipertansiyon durumunda g\u00f6zlenir.<\/li>\n
- Artm\u0131\u015f PSV, fetuste anemi ve hiperkapni durumunda g\u00f6zlenir.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"
T\u00fcm v\u00fccut damarlar\u0131m\u0131z kan ak\u0131m\u0131n\u0131n h\u0131z\u0131n\u0131 azaltan belirgin bir dirence sahiptir. Kalp kan\u0131 bas\u0131n\u00e7la pompalay\u0131p damarlar\u0131n direncini yener. V\u00fccudumuz \u00f6zellikle kan dola\u015f\u0131m\u0131n\u0131n h\u0131zland\u0131r\u0131lmas\u0131 gereken organlar\u0131n damarlar\u0131n\u0131 geni\u015fleterek direnci d\u00fc\u015f\u00fcr\u00fcr. B\u00f6ylece bu organlara daha bol kan g\u00f6nderilmi\u015f olur. Rahim damarlar\u0131 da gelen kana diren\u00e7 g\u00f6sterecek bir yap\u0131ya sahiptir. Ancak gebelik b\u00fcy\u00fcmeye ba\u015flad\u0131\u011f\u0131nda bebe\u011fin besin gereksinimi artar. […]<\/p>\n","protected":false},"author":1,"featured_media":5223,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[32],"tags":[],"yoast_head":"\n
23-26 Hafta Ultrasonu (Doppler Ultrason) - \u0130zmir Kar\u015f\u0131yaka Kad\u0131n Do\u011fum Merkezi<\/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:\/\/izmirkarsiyakakadindogummerkezi.com\/doppler-ultrason\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"23-26 Hafta Ultrasonu (Doppler Ultrason) - \u0130zmir Kar\u015f\u0131yaka Kad\u0131n Do\u011fum Merkezi\" \/>\n<meta property=\"og:description\" content=\"T\u00fcm v\u00fccut damarlar\u0131m\u0131z kan ak\u0131m\u0131n\u0131n h\u0131z\u0131n\u0131 azaltan belirgin bir dirence sahiptir. Kalp kan\u0131 bas\u0131n\u00e7la pompalay\u0131p damarlar\u0131n direncini yener. V\u00fccudumuz \u00f6zellikle kan dola\u015f\u0131m\u0131n\u0131n h\u0131zland\u0131r\u0131lmas\u0131 gereken organlar\u0131n damarlar\u0131n\u0131 geni\u015fleterek direnci d\u00fc\u015f\u00fcr\u00fcr. B\u00f6ylece bu organlara daha bol kan g\u00f6nderilmi\u015f olur. Rahim damarlar\u0131 da gelen kana diren\u00e7 g\u00f6sterecek bir yap\u0131ya sahiptir. Ancak gebelik b\u00fcy\u00fcmeye ba\u015flad\u0131\u011f\u0131nda bebe\u011fin besin gereksinimi artar. […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/izmirkarsiyakakadindogummerkezi.com\/doppler-ultrason\/\" \/>\n<meta property=\"og:site_name\" content=\"\u0130zmir Kar\u015f\u0131yaka Kad\u0131n Do\u011fum Merkezi\" \/>\n<meta property=\"article:publisher\" content=\"http:\/\/facebook.com\/op.dr.hakankilavuz\" \/>\n<meta property=\"article:published_time\" content=\"2014-05-15T13:23:33+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/izmirkarsiyakakadindogummerkezi.com\/wp-content\/uploads\/2014\/05\/23-26.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"450\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"hakan\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@opdrkilavuz\" \/>\n<meta name=\"twitter:site\" content=\"@opdrkilavuz\" \/>\n<meta name=\"twitter:label1\" content=\"Yazan:\" \/>\n\t<meta name=\"twitter:data1\" content=\"hakan\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tahmini okuma s\u00fcresi\" \/>\n\t<meta name=\"twitter:data2\" content=\"8 dakika\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/izmirkarsiyakakadindogummerkezi.com\/doppler-ultrason\/\",\"url\":\"https:\/\/izmirkarsiyakakadindogummerkezi.com\/doppler-ultrason\/\",\"name\":\"23-26 Hafta Ultrasonu (Doppler Ultrason) - \u0130zmir Kar\u015f\u0131yaka Kad\u0131n Do\u011fum Merkezi\",\"isPartOf\":{\"@id\":\"https:\/\/izmirkarsiyakakadindogummerkezi.com\/#website\"},\"datePublished\":\"2014-05-15T13:23:33+00:00\",\"dateModified\":\"2014-05-15T13:23:33+00:00\",\"author\":{\"@id\":\"https:\/\/izmirkarsiyakakadindogummerkezi.com\/#\/schema\/person\/8a752617726b9b02bd10a28c1c4509a4\"},\"breadcrumb\":{\"@id\":\"https:\/\/izmirkarsiyakakadindogummerkezi.com\/doppler-ultrason\/#breadcrumb\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/izmirkarsiyakakadindogummerkezi.com\/doppler-ultrason\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/izmirkarsiyakakadindogummerkezi.com\/doppler-ultrason\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Ana sayfa\",\"item\":\"https:\/\/izmirkarsiyakakadindogummerkezi.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"23-26 Hafta Ultrasonu (Doppler Ultrason)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/izmirkarsiyakakadindogummerkezi.com\/#website\",\"url\":\"https:\/\/izmirkarsiyakakadindogummerkezi.com\/\",\"name\":\"\u0130zmir Kar\u015f\u0131yaka Kad\u0131n Do\u011fum Merkezi\",\"description\":\"Op. 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Kalp kan\u0131 bas\u0131n\u00e7la pompalay\u0131p damarlar\u0131n direncini yener. V\u00fccudumuz \u00f6zellikle kan dola\u015f\u0131m\u0131n\u0131n h\u0131zland\u0131r\u0131lmas\u0131 gereken organlar\u0131n damarlar\u0131n\u0131 geni\u015fleterek direnci d\u00fc\u015f\u00fcr\u00fcr. B\u00f6ylece bu organlara daha bol kan g\u00f6nderilmi\u015f olur. Rahim damarlar\u0131 da gelen kana diren\u00e7 g\u00f6sterecek bir yap\u0131ya sahiptir. Ancak gebelik b\u00fcy\u00fcmeye ba\u015flad\u0131\u011f\u0131nda bebe\u011fin besin gereksinimi artar. 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- Damar tonusunda de\u011fi\u015fiklikler\n