Özet
İyotlu kontrast ekstravazasyonu, intravenöz enjeksiyon sırasında kontrastın damar lümeni dışında çevre yumuşak dokulara yayılmasıdır. BT'de damar yolu çevresinde şişlik, ödem ve kızarıklık görülebilir; teşhis görüntülerini bozarak gereksiz radyasyona neden olabilir. Görüntüleme kaçağın yerini, doku planlarını ve yayılımını belgeleyebilir ancak ağrı, duyu, dolaşım ve hareket kısıtlılığı gibi klinik bulguların yerini tutmaz. Kompartman sendromu, ülserasyon veya nekroz nadir olsa da erken tanınması gereken doku hasarıdır.
Okuma sırası
- Periferik kateter giriş yeri. Kateterin girdiği tarafı ve kesit düzeyini belirleyip görüntüdeki parlak odağın damar yoluna yakınlığını bulun.
- Periferik ven. Opak venin lümen sınırını takip edin; kontrastın ven duvarını aşıp çevre yağ dokusuna dağılıp dağılmadığını ayırın.
- Cilt altı yağ dokusu. Subkutan yağ lobüllerinin açılıp açılmadığını ve cilt altı planının kalınlaşmasını değerlendirin.
- Fasya ve önkol kasları. Koronal planda kontrastın yüzeyel sınırlarda kalıp kalmadığını, derin fasya veya kas kompartmanına uzanıp uzanmadığını izleyin.
- Hedef arterler ve enjeksiyon sahası. Son olarak kaçan enjeksiyonun hedef damar opaklaşmasını bozup bozmadığını ve görüntü kapsamındaki yayılımı not edin; klinik doku hasarı belirtilerini görüntüye bakarak dışlamayın.
Faz ve pencere
- Kontrastlı edinim tanısal
- Enjeksiyon sırasında oluşan kaçak, tarama kapsamındaysa BT'de damar lümeni dışında yoğun iyotlu materyal olarak görülebilir.
Önerilen pencereler: Yumuşak doku (G 400 / M 40), Anjiyo (G 600 / M 150).
BT bulguları
- Damar dışı iyot odağı — periferik kateter çevresinde damar lümenini takip etmeyen iyotlu kontrast materyali.
- Subkutan kontrast yayılımı — enjeksiyon tarafında yağ dokusu aralıklarına uzanan kontrast deposudur.
- Yumuşak doku şişliği — infiltrasyon sahasında cilt altı planlarının kalınlaşması ve yağ lobüllerinin ayrışması.
- Fasyal planlara yayılım — kontrastın yüzeyel dokuyla sınırlı kalmayıp derin fasyaya veya kas kompartmanına uzanması.
- Büyük hacimli kaçaklar daha ciddi lokal komplikasyonlarla ilişkilidir ve yüksek enjeksiyon hızları kaçak gelişme riskini belirgin şekilde artırır.
- Ekstravazasyon görüntü kalitesini bozarak hedef damarların yeterli opaklaşmasını azaltabilir ve gereksiz radyasyon maruziyetine yol açabilir.
- Damar dışı kaçak — enjeksiyon kateterinin bulunduğu bölgede kontrastın damar lümeni dışında çevre yumuşak doku ve yağ planlarına yayılması.
Normalde
Normal görünümde kontrast venöz lümenle sınırlıdır; ekstravazasyon durumunda ise enjeksiyon bölgesinde yumuşak doku ödemi ve şişlik gelişebilir. Ekstravazasyon ile intralümeneral kontrastın ayrımında, yoğun iyotlu materyalin damar duvarını aşarak çevre yumuşak dokularda gözlendiği değerlendirilir.
Ayırıcı tanı
- Başarılı intravenöz enjeksiyonda kontrast madde damar içi akışı izlerken çevre dokuya sızıntı veya ekstravazasyon oluşmaz.
- Hematom
- yumuşak doku içinde kan yoğunluklu koleksiyon olabilir; eşzamanlı kontrast enjeksiyonu yoksa damar lümenine benzer çok yüksek iyot atenüasyonu beklenmez.
- Enjeksiyon sonrası ödem
- yağ planlarında şişlik yapabilir fakat iyotlu kontrast gibi keskin, çok yüksek atenüasyonlu materyal içermez.
- Arteriyel ekstravazasyon
- arter travması zemininde damar dışı kontrast odağı arteriyel fazda belirir ve gecikmiş görüntülerde büyüyebilir; periferik IV giriş yeri kaçağıyla mekanizma farklıdır.
Tuzaklar
- Opak yapının damar lümeniyle ilişkisi ve devamlılığı değerlendirilerek yumuşak doku kaçağından ayırılmalıdır.
- Küçük hacimli ekstravazasyon olayları klinik veya radyolojik olarak gözden kaçabilir; bu nedenle enjeksiyon bölgesi ve kateter pozisyonu titizlikle değerlendirilmelidir.
- Görüntüdeki yayılımın boyutu tek başına doku hasarının şiddetini belirlemez; nörovasküler bulgular ve klinik muayene ayrıca değerlendirilmelidir.
Kendini dene
BT'de antekubital kateter çevresinde çok parlak materyal ven dışı yağ aralıklarına uzanıyor. En olası olay?
Cevabı göster
Kontrast ekstravazasyonu. İyot yoğunluğundaki materyalin kateter yakınında damar lümeni dışında doku aralıklarına yayılması ekstravazasyonu gösterir. Hematom kan yoğunluklu koleksiyondur; tromboflebit ven duvarı ve çevresinde inflamatuvar değişiklik yapar; fistülde anormal arter-ven bağlantısı ve erken venöz dolum beklenir.
Enjeksiyon sonrasında kateter çevresinde cilt altı şişlik var; aynı edinimde damar dışı iyotlu materyal veya hematom yoğunluklu koleksiyon görülmüyor. En doğru yorum hangisidir?
Cevabı göster
Şişlik tek başına ekstravazasyonu doğrulamaz. Yumuşak doku şişliği özgül değildir; damar dışı iyotlu materyal görülmemesi görüntüde ekstravazasyonu doğrulamayı engeller. Arteriyel kanama için damar dışı kontrast göllenmesi, varis için genişlemiş venöz kanal beklenir.
İlgili konular
Kaynaklar
Bu sayfadaki 35 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 11 cümle bu karşılaştırmada düzeltildi (2026-10-08).
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Eğitim amaçlıdır; hasta başında tanı ve tedavi kararının yerine geçmez. İçerik yapay zekâ destekli bir süreçle güncel literatüre göre cümle cümle kaynaklarla karşılaştırıldı, ancak uzman radyolog incelemesinden geçmedi. Klinik kararlarda güncel kılavuzları, kurum protokollerini ve radyoloji raporunu esas alın.
