Akut emboli ve akut tromboz ayrımı BT bulguları

Özet

Akut arter kapanmasının emboli mi yoksa hastalıklı damar üzerinde gelişen tromboz mu olduğunu anlamak, BTA bulgularını doğru yorumlamaya ve emboli kaynağı ya da altta yatan PAH olasılığını klinik ekiple paylaşmaya yardım eder. Akut alt ekstremite iskemişinin etiolojisi emboli ve tromboz olarak ayrılır. Parsiyel sciatic arter gibi konjenital varyantlar, anevrizma oluşumu, stenoz ve oklüzyon yoluyla tromboz ve distal embolizasyona yol açabilir. Kronik ekstremitе tehdit edici iskemi, dinlenme ağrısı, gangren veya 2 haftadan uzun süren ayak ülserasyonu ile karakterizedir; venöz ve travmatik nedenler hariç tutulur.

Faz ve pencere

BTA tanısal: Kontrastlı BT anjiyografi, alt ekstremite periferer arter hastalığının değerlendirilmesinde ve prosedür öncesi planlamada anatomik detay sağlar. BT anjiyografisi, ekstremite travmalarında hayati organlara zarar vermeden vasküler hasarın hızlıca değerlendirilmesini sağlar.

Önerilen pencereler: Anjiyo (G 600 / M 150).

BT bulguları

Akut travmatik aort yaralanmasının tespiti ve derecelendirilmesinde BT anjiyografisi ilk tercih edilen görüntüleme modalitesidir.
Periferik arter hastalığında endovasküler debulking yöntemleri, stenoz oranlarını belirgin şekilde azaltarak ankiyo-bilezik indeksini iyileştirebilmektedir.
Yüzeyel femoral-popliteal arter anevrizması mural tromboz ve tromboembolik komplikasyon riski taşıyabilir; erken tanı ve zamanında cerrahi girişim önemlidir.
Totál diz protezi sonrası gelişen popliteal dal pseudoanevrizma, doppler ultrasonografi ve BT anjiyografisi ile saptanarak endovasküler embolizasyonla tedavi edilebilir.
Kas-iskelet travmaları ve vasküler yaralanmaların değerlendirilmesinde modern BT skanerlerinin hızı ve yakın mesafesi, acil hekimliğinde BT anjiyografinin yaygın kullanımını sağlamıştır.
İlaç saldıran stent uygulaması sonrası gelişen venöz bypass anevrizmatik dejenerasyonu, nadir de olsa graft başarısızlığına yol açabilmektedir.
Anevrizma içi mural trombüs — genişlemiş arter lümeninde eksantrik trombüs, kaynak lezyonun kendisinin tromboze olabileceğini gösterir.

Normalde

Foton sayıcı dedektörlü BT, kalsifikasyon ve stent kaynaklı blooming artefaktlarını azaltabilir ve daha yüksek uzaysal çözünürlükle küçük damarların görüntülenmesini sağlayabilir. Kronik ekstremitе tehdit edici iskemi değerlendirmesinde parmak basınçları, hemodinamik testler için tercih edilen objektif ölçümdür.

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 s0685; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Kronik aterosklerotik oklüzyon değerlendirilirken akut ekstremite iskemisinin emboli ve tromboz şeklindeki temel etiyolojik ayrımı göz önünde bulundurulur.
İzole üst ekstremite güçsüzlüğü çoğunlukla karşı el motor alanı enfarktüsüyle ilişkilidir; bu hastalarda karotis darlığı veya düzensiz plak sık görülür ve bazı olgularda darlık %70’in altında olsa da plak ülserasyonu ya da trombüsü bulunabilir.
Arter diseksiyonu: lümen içinde intimal flep ve gerçek/yalancı lümen ayrımı görülür; serbest intraluminal embolik defektle karıştırılmamalıdır.
Kan-damar bariyeri hasarı ve endotel disfonksiyonu, serebral anjiyografi sırasında kullanılan iyotlu kontrast maddeler ve mekanik faktörlerle tetiklenebilir.
Akut mezenterik iskemi şüphesinde, atriyal fibrilasyonu olan hastalarda ilk basamak görüntüleme olarak BT anjiyografisi önerilmektedir.

Tuzaklar

BT anjiyografide intramural hematomla birlikte ülser benzeri çıkıntı ve penetran aterosklerotik ülser görülebilir.
Travmatik olmayan aort yaralanmalarında, protokol optimizasyonu ve EKG senkronize BT ile artefaktlar azaltılarak tanı belirsizliği minimize edilebilir.
Alt ekstremite BTA'sında kalp ve aort kökü kadraja girmeyebilir; görüntü kapsamı dışında kalan emboli kaynağını negatif kabul etmeyin.

Kendini dene

Akut ekstremite iskemisinin temel etiyolojik ayrımı aşağıdakilerden hangisidir?
Cevabı göster
Emboli ve tromboz. Akut ekstremite iskemisinin etiyolojisi emboli ve tromboz olarak iki ana gruba ayrılır.
Akut ekstremite iskemisinde aşağıdakilerden hangisi cerrahi revaskülarizasyon yöntemlerinden biridir?
Cevabı göster
Cerrahi tromboembolektomi. Cerrahi revaskülarizasyon tromboembolektomi veya baypas ile yapılabilir; endovasküler ya da hibrit yöntemler de kullanılabilir.

İlgili konular

Kaynaklar

Bu sayfadaki 33 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 28 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.