Miyokart enfarktüsünün BT bulguları

Özet

Miyokart enfarktüsü, koroner kan akımındaki kesilme veya ciddi azalma sonrası miyokartta gelişen iskemik nekrozdur; akut tanı öncelikli olarak klinik değerlendirme, elektrokardiyografi, ekokardiyografi ve koroner anjiyografi verilerine dayanır. BT, akut koroner oklüzyon şüphesinde rutin ilk tanı testi değildir; başka acil nedenler araştırılırken görülen perfüzyon kusurunu gösterebilir ve seçilmiş kardiyak BT incelemelerinde geç iyot tutulumu ile infarktüsün yerini ve yayılımını karakterize edebilir. Koroner arter alanına uyan subendokardiyal ya da transmural tutulum, iskemik dağılımı destekler; miyokardit gibi koroner olmayan süreçler çoğunlukla farklı bir dağılım gösterir. Perfüzyon kusuru veya geç tutulumun gözden kaçması infarktüs yaygınlığını, sol ventrikül işlev bozukluğu ve mekanik komplikasyon riskini eksik değerlendirmeye yol açabilir.

Faz ve pencere

Arteriyel tanısal

Kardiyak BT perfüzyon görüntülemede akut iskemi, komşu canlı miyokarda göre bölgesel düşük atenüasyon (hipoperfüzyon) gösterebilir; bu bulgunun koroner arter dağılımına uyması tanının lehinedir. Bu bulgu klinik akut enfarktüs tanısını tek başına koydurmaz.

Gecikmiş tanısal

Geç iyot tutulumu serisinde infarktlı miyokart, kan havuzu ve sağlam miyokarda göre geç kontrastlanma gösterebilir; tutulum genellikle subendokardiyal başlar ve transmural olabilir. Geç iyot tutulumlu BT ile seçilmiş hastalarda miyokardda mikrovasküler hasar izlenebilir.

Önerilen pencereler: Mediasten (G 350 / M 50), Anjiyo (G 600 / M 150).

BT bulguları

• Koroner arter dağılımına uyan hipoperfüzyon — LAD, RCA veya sirkumfleks arter alanında komşu miyokarda göre düşük atenüasyon.
• Subendokardiyal geç iyot tutulumu — endokardan başlayıp epikarda ulaşmayan ve koroner arter dağılımını izleyen geç kontrastlanma.
• Transmural geç tutulum — aynı segmentte endokardan epikarda uzanan kontrast tutulumu; yüksek skar yükü ve prognoz açısından önem taşır.
• Bölgesel duvar incelmesi ve akinezi/diskinezi — kronik infarkt alanında incelmiş miyokart ve sistolde dışa hareket.
• İnfarkt alanında yağlı metaplazi — kronik hasarlı miyokart dokusu içinde düşük atenüasyonlu yağ odakları.
• Sol ventrikül yeniden şekillenmesi — kavite genişlemesi, bölgesel duvar geometrisinde değişiklik ve genellikle eşlik eden düşük ejeksiyon fraksiyonu ile karakterizedir.
• İnfarkt ilişkili komplikasyon — apikal mural trombüs, gerçek anevrizma veya serbest duvar yırtığına bağlı psödoanevrizma araştırılır.

Normalde

Normal sol ventrikül miyokardı, aynı kardiyak fazda ve aynı kesit düzeyinde çevresel, benzer yoğunlukta kontrastlanır; endokarddan epikarda uzanan bölgesel bir hipoenhancement ya da geç tutulum alanı bulunmaz. Şüpheli segmenti karşı duvarla, komşu segmentlerle ve LAD/RCA/sirkumfleks koroner dağılımıyla kıyaslayın; yalnız tek kesitte görülen parlaklığı duvar hareketi ve ardışık kesitlerdeki devamlılıkla doğrulayın.

Ayırıcı tanı

Miyokardit

sıklıkla subepikardiyal veya orta duvar geç tutulumu; tek bir koroner arter alanına uymaz.

Takotsubo sendromu

koroner dağılımı aşan bölgesel duvar hareket bozukluğu; BT'de geç infarkt tutulumu tipik değildir.

Kronik infarkt sonrası sık gelişen miyokard içi lipomatoz metaplazi, BT'de düşük atenüasyon gösterir ve ekstraselüler hacim ölçümlerini yanıltıcı biçimde normale çekebilir.

Kardiyak amiloidoz

yaygın/diffüz miyokart kalınlaşması ve geç iyot tutulumu, bölgesel koroner dağılımdan farklıdır.

Hareket veya teknik artefaktlar

anatomik segmenti izlemeyen, komşu kesitlerde ve ortogonal düzlemde tekrarlanmayan yalancı düşük atenüasyon.

Tuzaklar

• Koroner anjiyografi amacıyla yapılan kontrastlı BT'de görülen bölgesel miyokartta düşük atenüasyon, koroner dağılımı izlemiyorsa veya komşu kesitlerde tekrarlanmıyorsa artefakt olabilir; ancak bu bulgular akut enfarktüs olgusu olarak ele alınmalıdır.
• Subendokardiyal geç tutulum, hâlâ kontrastlı sol ventrikül kan havuzuyla benzer yoğunlukta kalabilir; dar lezyonu kısa eksen ve ortogonal MPR'de yeniden inceleyin.
• Koroner BT anjiyografi yüksek negatif prediktif değere sahiptir; miyokart perfüzyon kusuru, koroner lümen daralmasıyla tam örtüşmeyebilir ve ek değerlendirmeyi gerektirebilir.
• Akut hipoenhancement ile geç hiperenhancement aynı incelemede farklı zamanlama ve mekanizmaları yansıtır; tek bir fazdan infarkt yaşını kesin çıkarmayın.

Kendini dene

1. Kardiyak BT'de geç iyot tutulumu en doğrudan hangi dokusal özelliğin değerlendirilmesine katkı sağlar?

   • Miyokart enfarktüsü ve fibrozis
   • Koroner arterlerdeki kan akımının hızı
   • Kalp kapakçıklarının açılma basıncı
   • Miyokardın elektriksel iletim süresi
   Cevabı göster

   Miyokart enfarktüsü ve fibrozis. Geç iyot tutulumu, kardiyak BT'de miyokart enfarktüsü ve fibrozisin doğrudan görüntülenmesine katkı sağlar.

2. Bir segmentte hipoenhancement yalnız arteriyel seride görülüyor; geç seride koroner dağılımlı tutulum yok. En doğru yorum hangisi?

   • Perfüzyon kusuru olası
   • Kesin kronik skar
   • Miyokardit kanıtı
   • Anevrizma tanısı
   Cevabı göster

   Perfüzyon kusuru olası. BT'de miyokartta bölgesel düşük atenüasyon iskemiyle ilişkili olabilir; koroner arter dağılımına uyması infarkt olasılığını artırır, ancak artefaktlar da bu görünümü taklit edebilir. Tek başına arteriyel serideki bölgesel düşük atenüasyon akut miyokart enfarktüsünü kesinleştirmez; bu bulgu ek tanısal değerlendirme gerektirir.

İlgili konular

• Sol ventrikül gerçek anevrizması
• Sol ventrikül trombüsü
• Kardiyak kitle: trombüs-tümör ayrımı

Kaynaklar

Bu sayfadaki 37 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 17 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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