Aort koarktasyonu ve onarım sonrası rezidü

Özet

Üst-alt ekstremite nabız veya basınç farkı, hipertansiyon ya da konjenital kalp hastalığı bulunan hastada aort koarktasyonu ark-istmus düzeyindeki doğumsal daralma olarak değerlendirilir. BTA, dar segmentin uzunluğunu ve yönünü, ark hipoplazisini, kollateral dolaşımı ve cerrahi ya da stent sonrası anatomiyi yüksek çözünürlükle gösterir. Onarım sonrasında rezidüel/rekoarktasyon ile anevrizma veya psödoanevrizma gelişimi değerlendirilir. Daralmayı eğik kesitte ölçmek yalancı darlık oluşturabileceğinden, damar merkez hattına dik MPR ile gerçek lümen değerlendirilmelidir.

Faz ve pencere

BTA tanısal

Aort lümenini ark dallarından diyaframa kadar arteriyel fazda izleyerek istmus çap ve uzunluğunu, poststenotik genişlemeyi, kollateral damarları ve onarım/stent segmentinde rezidü darlık veya kontrast dolan psödoanevrizmayı göster.

Gecikmiş

Onarım yatağında aktif kaçak ya da çevre koleksiyon şüphesi varsa gecikmiş görüntüleme kontrastın damar dışına devam eden dolumunu değerlendirebilir; rutin doğal koarktasyon tanısı için gerekli değildir.

BT bulguları

• İsthmik daralma — sol subklavian arter çıkışının distalinde, duktal kalıntı komşuluğunda fokal veya uzun segment kalibre azalması.
• Transvers ark hipoplazisi — darlamanın istmus bölgesiyle birlikte transvers ark boyuncunda da kalibre azalması olarak izlenebilir.
• Poststenotik genişleme — dar segment distalindeki inen aortada kontur ve kalibre artışı görülebilir.
• Kollateral arterler — genişlemiş interkostal, internal torasik ve skapular damarlar stenoz çevresinden distal aortaya kan taşır.
• Onarım sonrası rezidü darlık — yama/anastomoz veya stent lümeninde fokal daralma ve distal akım yatağında genişleme araştırılır.
• Yama anevrizması veya psödoanevrizma — onarım hattında keseleşen, kontrastla dolan lümen ya da çevre duvar dışına çıkan odak bulunabilir.
• Stent komplikasyonu — stent içi daralma, trombüs, kırık, yer değiştirme ve aort duvarı hasarı değerlendirilir.
• Eşlik eden aort ve kalp anomalisi — biküspit aort kapağına bağlı çıkan aort genişlemesi veya ark dallanma varyantları eşlik edebilir.
• BT’de koarktasyonun en dar çapını ve diyafragma düzeyindeki inen aorta çapını ayrı ayrı ölçüp raporla; hemodinamik değerlendirmeyi klinik bulgular ve ekokardiyografik ya da invaziv basınç gradyanlarıyla birlikte yap.

Normalde

Normal istmus sol subklavian arter çıkışının hemen distalinde yer alır; koarktasyonda bu bölgede lümen daralması görülür. Aksiyel görüntüde tek kesit çapına güvenmek yerine centerline'a dik ortogonal MPR'de koarktasyon segmentini proksimal ark ve distal inen aortayla kıyasla; kollateral damarların belirginleşmediğini kontrol et.

Ayırıcı tanı

Psödo-koarktasyon

arkta uzama ve kıvrılma vardır, ancak gerçek lümen daralması ile belirgin kollateral dolaşım yoktur.

Aortik ark hipoplazisi

darlamanın istmus bölgesiyle birlikte transvers ark boyuncunda da kalibre azalması olarak izlenebilir.

Orta aortik sendrom

torasik istmus yerine daha uzun abdominal veya torakoabdominal aort segmentinde daralma bulunur.

Stent içi restenoz

daha önce tedavi edilmiş hastada stent segmentinin içinde lümen daralır; metal artefaktı açıklığı olduğundan küçük gösterebilir.

Onarım hattı psödoanevrizması

fokal kontrast dolan kese damar konturundan dışarı taşar; düzgün, beklenen yama genişlemesinden farklıdır.

Tuzaklar

• Ark eğriliğine paralel olmayan aksiyel kesitte koarktasyonu olduğundan dar ölçme; lümen çapını centerline'a dik yeniden formatta değerlendir.
• Geniş kollateralleri ayrı bir vasküler malformasyon sanma; internal torasik ve interkostal arterlerin iki taraflı belirginleşmesi kronik basınca eşlik edebilir.
• Stent çevresindeki blooming artefaktını gerçek restenoz kabul etme; farklı düzlem ve rekonstrüksiyonlarda metal gölgelenmesinin ötesindeki kontrastlı lümeni kontrol et.
• Ameliyat sonrası aort konturundaki her çıkıntıyı psödoanevrizma sayma; dikiş hattı, greft geometrisi ve eski incelemelerle karşılaştır.

Kendini dene

1. Sol subklavian çıkışının hemen distalinde daralma, distal inen aortada genişleme ve interkostal damar belirginliği var. Tanı?

   • Aort koarktasyonu
   • Psödo-koarktasyon
   • Orta aortik sendrom
   • Aort diseksiyonu
   Cevabı göster

   Aort koarktasyonu. İsthmik daralma ile distal genişleme ve kronik kollateral damarlar koarktasyon örüntüsüdür. Psödo-koarktasyonda gerçek lümen darlığı ve kollateraller bulunmaz; orta aortik sendrom daha uzun ve genellikle aşağı seviyeli darlık yapar; diseksiyon flebi görülür.

2. Onarılmış koarktasyon alanında kontrastlanan kese aort dış konturuna taşıyor. Öncelikle hangi komplikasyon düşünülür?

   • Anastomoz psödoanevrizması
   • Yama restenozu
   • Psödo-koarktasyon
   • Aberan subklavian arter
   Cevabı göster

   Anastomoz psödoanevrizması. Damar dış konturuna bağlı kontrast dolan kese onarım hattı psödoanevrizmasını düşündürür. Restenoz lümen daralmasıdır; psödo-koarktasyon doğumsal kıvrımlı ark biçimidir; aberan subklavian arter ise dal köken-seyir varyantıdır.

İlgili konular

• Anormal pulmoner venöz dönüş
• Atriyal septal defekt
• Konjenital kalp cerrahisi sonrası yapısal komplikasyonlar

Kaynaklar

Bu sayfadaki 40 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 5 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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Eğitim amaçlıdır; hasta başında tanı ve tedavi kararının yerine geçmez, tıbbi tavsiye değildir. Metinler yapay zekâ desteğiyle yazıldı ve otomatik bir adımda kaynak alıntılarıyla karşılaştırıldı; bu bir tıbbi doğrulama değildir ve içerik uzman radyolog incelemesinden geçmedi. Klinik kararlarda güncel kılavuzları, kurum protokollerini ve radyoloji raporunu esas alın.