Özet
Göğüs ağrısı veya bilinen aterosklerozu olan hastada koroner darlık, miyokardın kanlanmasını sınırlayabilecek lümen kaybını gösterir. Koroner BT anjiyografi (K-BTA), plakla birlikte damar lümenini invaziv olmayan biçimde değerlendirir ve darlığı hasta düzeyinde sınıflandırır. Darlık derecesi tek başına iskemi kanıtı değildir; klinik bağlamda işlevsel değerlendirme gerekebilir. Sol ana koroner darlığı prognostik açıdan önemlidir; ciddi üç damar hastalığı da yüksek riskli K-BTA bulguları arasındadır.
Faz ve pencere
- BTA tanısal
- Koroner arterler iyotlu kontrastla opaklaşırken plak düzeyindeki en dar lümen kısa eksen ve damar eksenine paralel rekonstrüksiyonlarda ölçülür; stenoz, hastalıklı lümenin çapının uygun referans segmente göre yüzde çap azalması olarak tahmin edilir. Bu inceleme stenozu gösterir, tek başına fizyolojik anlamını kanıtlamaz.
- Kontrastsız
- Kalsiyum skorlama çekimi kalsifiye plağı ve koroner kalsiyum yükünü saptar; lümen opaklaşmadığı için lümen stenoz yüzdesini ölçemez.
Önerilen pencereler: Anjiyo (G 600 / M 150), Mediasten (G 350 / M 50).
BT bulguları
- Plakla ilişkili fokal ya da uzun segment lümen daralması; kalsifiye, nonkalsifiye veya mikst plak bileşenini belirt.
- Koroner BT anjiyografide stenoz şiddeti yüzde çap darlığı olarak nicelendirilebilir.
- Darlığın ostium, proksimal segment, bifürkasyon veya yan dal ağzıyla ilişkisini belirt.
- Koroner BT anjiyografide koroner lümen ve darlık değerlendirilir.
- Kalsiyum blooming gerçek lümen çapını olduğundan küçük gösterebilir; yoğun kalsifik segmentte kesin derece güvenilmez olabilir.
- Hareket, gürültü, yetersiz kontrastlanma veya stent metal artefaktı varsa segmenti tanısal olmayan olarak işaretle.
Ölçütler ve sınıflamalar
- CAD-RADS 2.0 stenoz kategorileri
- Kaynaklarda desteklenen CAD-RADS stenoz kategorileri: 0: koroner hastalık bulgusu yok; 1: %1–24; 2: %25–49; 3: %50–69; 4: %70–99; 5: tam oklüzyon.
- CAD-RADS 2.0 stenoz derecesi
- CAD-RADS, hasta düzeyindeki görüntüleme sonucunu en ciddi koroner lezyona göre özetler. CAD-RADS 0 hem plak hem darlık yokluğunu ifade eder.
Normalde
CAD-RADS 0, koroner BT anjiyografide koroner arter hastalığına ilişkin bulgu olmadığını ifade eder. Koroner damarlar, eğrisel çok düzlemli rekonstrüksiyonda ardışık kesitlerle incelenebilir. CAD-RADS 0 için hem koroner plak hem de lümen darlığı bulunmamalıdır; yalnızca darlık görülmemesi, nonobstrüktif plağı dışlamaz.
Normal BT ile kıyasla
Aynı bölgenin, kaynak veri setinde patoloji içermediği belirtilen bir BT incelemesini kesit kesit kaydırın; organ sınırlarını açarak anatomiyi hasta görüntüsüyle karşılaştırın. Küçük rastlantısal bulgular tümüyle dışlanmamıştır.
Kaynak: TotalSegmentator v2.01 veri seti (Wasserthal ve ark., Radiology: Artificial Intelligence 2023), CC BY 4.0, vaka s0977; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.
Ayırıcı tanı
- Koroner spazm
- fokal daralma plak olmaksızın görülebilir; tek anlık BT görüntüsü spazmı aterosklerozdan kesin ayıramayabilir.
- Spontan koroner arter diseksiyonunda OCT'de intramural hematom ve yalancı lümen morfolojisi tanıyı destekler.
- Miyokard köprüsü
- özellikle LAD orta segmentinde intramiyokardiyal seyir ve sistolik sıkışma görünümü verir.
- Koroner arter anomalisi
- beklenmedik çıkış veya seyir darlık gibi izlenebilir; damar ostiumu ve üç boyutlu seyri takip edilir.
Tuzaklar
- Yoğun kalsifik plağın blooming artefaktı lümeni örter ve stenozu fazla tahmin ettirebilir; bu segmentte kesin yüzde yerine değerlendirme kısıtını raporla.
- Koroner BT anjiyografide kalsiyum bloomingi ve sınırlı uzaysal çözünürlük, stenoz derecesinin fazla tahmin edilmesine yol açabilir.
- Hareket basamaklanması küçük koroner dallarda lümen sınırını bozabilir; kesinti tek düzlemdeyse ardışık faz ve rekonstrüksiyonları kontrol et.
- Anatomik darlık, iskemiyle eş anlamlı değildir; CAD-RADS stenoz kategorisini fizyolojik test sonucuyla karıştırma.
Kendini dene
Koroner BT anjiyografide aşırı vasküler kalsifikasyonlar hangi artefakte yol açar ve bunun etkisi nedir?
Cevabı göster
B) Blooming artefaktı, stenozu abartabilir. S2 kaynağında, aşırı kalsifikasyonların kalsiyum blooming artefaktına neden olarak pozitif prediktif değeri düşürdüğü ve stenoz derecesinin abartılabileceği ifade edilmiştir.
Koroner BT anjiyografinin anatomik değerlendirmesini işlevsel değerlendirmeyle tamamlayabilen teknikler hangileridir?
Cevabı göster
CT-MPI ve CT-FFR. CT-MPI ve CT-FFR, koroner BT anjiyografiye ek olarak miyokard perfüzyonunu veya lezyonun fizyolojik sonuçlarını değerlendirebilir.
İlgili konular
- CAD-RADS 2.0 raporlama kavramı
- Koroner plak tipleri: kalsifiye, kısmen kalsifiye ve kalsifiye olmayan
Kaynaklar
Bu sayfadaki 37 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 10 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.