Hipoksik-iskemik beyin hasarı

Özet

Kardiyak arrest, şok veya ağır hipoksemi sonrasında gelişen hipoksik-iskemik beyin hasarında kontrastsız BT, yapısal ödemi ve eşlik eden kanama ya da kitle etkisini hızla değerlendirmek için kullanılır. Kontrastsız BT'de hipoksik-iskemik değişiklikler hafif gri-beyaz ayrım kaybından düşük yoğunluklu genel ödemine kadar değişir; derin gri çekirdeklerin hipodensitesi ve sulkus basılması sık görülür. Yaygın ödem bazal sisternleri daraltıp herniasyona ilerleyebilir; bu bulgular kritik radyolojik uyarıdır. Tek başına erken BT ile hasarı veya prognozu dışlamak, gecikmiş ödemi ve klinik kötüleşmeyi kaçırabilir; nöroprognostik karar çoklu klinik ve nörofizyolojik verilerle ele alınır.

Faz ve pencere

Kontrastsız tanısal

Başlangıç incelemesi doğal olabilir; belirginleşen hasarda damar alanlarını aşan bilateral kortikal ve derin gri cevher hipodensitesi, gri-beyaz ayrım kaybı, sulkus silinmesi ve bazal sistern basısı görülür. Kontrastsız BT, hipoksik-iskemik hasarın gri-beyaz ayrım kaybı ve ödem paternini göstermek için temel görüntüleme yöntemidir.

Önerilen pencereler: Beyin (G 80 / M 40), Subdural (G 200 / M 75).

BT bulguları

• Yaygın gri-beyaz ayrım kaybı — korteks ile komşu subkortikal beyaz cevher arasındaki normal dansite sınırı iki hemisferde silikleşir.
• Kortikal sulkus silinmesi — serebral ödemle birlikte konveksite sulkusları daralır veya seçilemez.
• Derin gri cevher hipodensitesi — kaudat başı, putamen, globus pallidus veya talamuslar korteksteki ödemle birlikte düşük atenüasyon gösterebilir.
• Bazal sistern daralması — suprasellar ve perimezensefalik sisternlerin basılması artmış kitle etkisini gösterir.
• Ventrikül basısı — lateral ve üçüncü ventrikül küçülür; eşlik eden hidrosefali varsa ventrikül görünümü farklılaşabilir.
• Yaygın ödem ve herniasyon — orta hat kayması, unkal veya tonsiller yer değiştirme ileri basınç etkisini gösterir.

Normalde

Normal gri-beyaz ayrımda kortikal gri cevher, hemen altındaki beyaz cevherden daha yüksek dansitelidir; kaudat, lentiform çekirdekler ve talamuslar da seçilebilir sınırlarını korur. Konveksite sulkusları açık, suprasellar ve perimezensefalik sisternler dolgun, ventriküller basısız görünür; aynı düzeylerde bu sınırların yaygın silinip silinmediğini ve simetrisini karşılaştır.

Ayırıcı tanı

Hipoglisemik ensefalopati

iki taraflı korteks, bazal ganglionlar veya periventriküler bölge lezyonları olabilir; klinik glukoz bilgisi ve paternin yaygın ödem derecesi ayırıcıdır.

Metanol toksisitesi

bilateral putaminal nekroz, özellikle kanama bileşeni, daha bölgesel toksik hasar paternidir.

Tuzaklar

• Arrest sonrası hemen çekilen doğal BT’yi beyin hasarı yokluğu şeklinde yorumlama; erken incelemenin ödem gelişmeden yapılmış olabileceğini raporda belirt.
• Tek bir silik kortikal sulkusu yaygın ödem sayma; hareket, kemik kaynaklı sertleşme ve parsiyel hacim etkisi gri-beyaz sınırı yanıltabilir.
• Gri-beyaz ayrım kaybını tek başına kesin prognoz olarak sunma; kılavuzlar görüntülemeyi klinik bağlam ve diğer nöroprognostik verilerle birlikte ele alır.
• Orta hat kayması olmamasını ağır ödemi dışlamak için kullanma; simetrik yaygın şişmede kayma belirgin olmayabilir, sisternleri ve sulkusları da incele.

Kendini dene

1. Kardiyak arrest sonrası BT’de iki hemisferde gri-beyaz sınırlar silik, sulkuslar dar ve lentiform çekirdekler hipodens. Patern en çok neyi düşündürür?

   • Hipoksik-iskemik hasar
   • Bilateral MCA enfarktı
   • Subaraknoid kanama
   • Normal yaşlanma
   Cevabı göster

   Hipoksik-iskemik hasar. Birden fazla damar alanına yayılan gri-beyaz ayrım kaybı ve yaygın sulkal silinme global hipoksik-iskemik ödemle uyumludur. MCA enfarktı tipik olarak tek damar alanına uyar; kanama hiperdens görünür, normal yaşlanma bu akut yaygın ödem paternini oluşturmaz.

2. Arrestten hemen sonra alınan BT’de parankim doğal, klinik koma sürüyor. Bu inceleme neyi gösterir?

   • Erken BT hasarı dışlamaz
   • Kesin beyin ölümü
   • Yalnızca metanol maruziyeti
   • Gecikmiş atrofi
   Cevabı göster

   Erken BT hasarı dışlamaz. Erken BT’de hipoksik-iskemik değişiklikler henüz görünür olmayabilir; normal görünüm hasarı veya ilerleyen ödemi dışlamaz. Beyin ölümü yalnız BT ile tanınmaz; metanol için maruziyet ve tipik putaminal patern, atrofi için kronik hacim kaybı gerekir.

İlgili konular

• Hiperammonemik ensefalopati

Kaynaklar

Bu sayfadaki 33 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 3 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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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.