Erken iskemik değişiklikler

Özet

Ani fokal nörolojik defisitte erken iskemik değişiklikler, henüz belirgin infarkt hipodensitesi oluşmadan etkilenmiş dokunun yerini gösterebilir. Kontrastsız beyin BT'si öncelikle kanamayı dışlar; gri-beyaz cevher ayrımındaki silinme ve bölgesel şişme iskemi lehine ipuçlarıdır. Bulgular çok erken dönemde hafif olabilir ve normal görünen BT akut inmeyi dışlamaz. Akut dönemde yapılan erken BT'lerde iskemiye ait değişiklikler henüz oluşmamış olabilir ve ilk çekimler normal bulunabilir.

Faz ve pencere

Kontrastsız tanısal

İskemik parankimde karşı hemisfere göre hafif düşük atenüasyon, korteks-beyaz cevher sınırında bulanıklık, insular şeritte silinme ve sulkuslarda daralma aranır; erken bulgular tek kesitte belirsiz olabilir. İyotlu kontrast gerekmez.

Önerilen pencereler: İnme (G 40 / M 40), Beyin (G 80 / M 40).

BT bulguları

• Gri-beyaz cevher ayrım kaybı — kortikal gri cevher ile komşu subkortikal beyaz cevher arasındaki doğal kontrast azalır.
• İnsular şerit silinmesi — insular korteksin gri cevher çizgisi silikleşir; MCA yatağı iskemiğinde erken fark edilebilir.
• Lentiform çekirdek belirsizliği — putamen ve globus pallidus'un keskin sınırı karşı tarafa göre kaybolur.
• Kortikal sulkus silinmesi — ödemli giruslar arasındaki BOS aralıkları daralır.
• Fokal parankimal hipodensite — MCA veya başka arter alanına uyan gri cevher ve komşu beyaz cevherde düşük atenüasyon belirir.
• Arter alanına uyan asimetri — bir hemisferdeki gri cevher silinmesi damar dağılımını izler ve karşı tarafta benzer derecede bulunmaz.

Normalde

Normal insular korteks, Sylvian yarığı ile eksternal kapsül arasında ince ve belirgin gri şerit olarak seçilir; lentiform çekirdek de çevresindeki internal ve eksternal kapsülden ayrılır. Aynı aksiyel kesitte insular korteks, putamen ve sulkuslar gibi ASPECTS bölgeleri, karşı hemisferle kıyaslanarak gri-beyaz cevher ayrımı kaybı veya sulkus daralması açısından değerlendirilir.

Ayırıcı tanı

Eski infarkt

hacim kaybı, ensefalomalazi ve komşu ventrikülde çekilme akut şişmeden ayrılır.

Kronik küçük damar hastalığı

periventriküler ve derin beyaz cevherde lökoarayıoz izlenir; kortikal gri cevher silinmesiyle ilişkili ayırıcı tanı desteği yetersizdir.

Postiktal değişiklik

kortikal şişme damar alanını aşabilir ve eşlik eden fokal damar tıkanıklığı bulunmayabilir.

Hipoglisemik ensefalopati

derin gri çekirdek veya korteks tutulumu inmeyi taklit edebilir; bulgular klasik tek damar alanına oturmayabilir.

İntrakraniyal kanama

akut kan ürünleri parankimde hiperdens görünür; iskemi için tarif edilen düşük atenüasyon örüntüsünden farklıdır.

Tuzaklar

• Çok erken saatlerde parankim normal görünebilir; normal kontrastsız BT'yi iskemi yokluğu şeklinde yorumlama.
• Hareket, parsiyel hacim etkisi ve pencere ayarı insular şeridi yalancı silik gösterebilir; komşu kesitlerle ve karşı tarafla birlikte izle.
• Yaşa bağlı beyin atrofisi sulkusları genişletebilir; akut iskemi ise bölgesel ödem ve kütle etkisi ile sulkuslarda daralmaya yol açabilir.
• Eski enfarktın kalıcı hipodensitesini yeni değişiklik sanma; doku kaybı ve ex-vacuo genişlemeyi ara.

Kendini dene

1. Ani sağ hemiparezide sol insular şerit ve lentiform sınır silik, kanama yok. En olası erken bulgu nedir?

   • Akut iskemik değişiklik
   • Kronik laküner kavite
   • Subdural hematom
   • Postiktal kortikal ödem
   Cevabı göster

   Akut iskemik değişiklik. Tek taraflı insula ve lentiform çekirdekte gri-beyaz ayrım kaybı, klinikle uyumlu erken MCA iskemisini destekler. Kronik kavite doku kaybı yapar; subdural hematom ekstraaksiyel koleksiyondur; postiktal ödem arter alanının dışına yayılabilir.

2. Kontrastsız BT'de belirgin parankim asimetrisi görülmeyen hastada akut inme şüphesi sürüyor. En doğru yorum hangisidir?

   • Erken iskemi dışlanmaz
   • MCA oklüzyonu kesin dışlanır
   • BT mutlaka tekrarlanmalıdır
   • Bulgular eski infarktı kanıtlar
   Cevabı göster

   Erken iskemi dışlanmaz. Hiperakut iskemide parankim değişiklikleri henüz görünür olmayabilir; normal erken BT iskemiyi dışlamaz. Erken kontrastsız BT normal bulunabilir ve bu durum büyük damar açıklığını, tedavi endikasyonunu veya kronik lezyonları doğrudan kanıtlamaz.

Bu konunun yer aldığı turlar

• İnme BT'si: erken iskemi, damar ve taklitçiler

İlgili konular

• ASPECTS: MCA alanı erken BT skoru
• Hiperdens arter işareti
• MCA alanı infarktı
• BT perfüzyon: temel haritalar

Kaynaklar

Bu sayfadaki 36 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 12 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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