Postoperatif pnömoperitoneum ve beklenen serbest hava BT

Özet

Sezaryen ve CO₂ insuflasyonu kullanılan cerrahilerden sonra peritoneal serbest hava görülebilir; bulgu ameliyat sonrası zamanla birlikte değerlendirilir. BT serbest havayı gösterir; enterik kontrast kullanılan BT'de kontrastın lümen dışına çıkışı perforasyon lehine bulgu olabilir. Tek başına postoperatif serbest hava bağırsak perforasyonunu kanıtlamaz; ilerleyen pnömoperitoneum, kontrast çalışması negatif olsa bile, gizli bağırsak yaralanması şüphesini artırabilir. Kaçak veya perforasyonun gözden kaçması peritonit ve sepsise ilerleyebilir.

Faz ve pencere

Kontrastsız tanısal: Diyafram altı, cerrahi yatak, mezenter ve karın ön duvarı boyunca yağ yoğunluğundan belirgin düşük serbest gaz odakları, miktarı ve dağılımı değerlendirilir.
Portal tanısal: Kontrastlı BT'de serbest sıvı, bağırsak dilatasyonu ve duvar kalınlaşması değerlendirilebilir; oral kontrastın lümen dışına çıkışı perforasyon lehine bulgudur.

Önerilen pencereler G genişlik, M merkez; değerler Hounsfield birimi (HU)

BatınG 400 / M +50
Yumuşak dokuG 400 / M +40

BT bulguları

Peritoneal boşlukta serbest gazın miktarı ve dağılımı değerlendirilir.
Postoperatif BT'de serbest hava izlenebilir; seri incelemelerde artış olup olmadığı karşılaştırılır.
Önceki incelemeye göre serbest havanın azalması, kararlı kalması veya artması
Cerrahi hat komşuluğunda hava ile birlikte sıvı koleksiyonu ve oral kontrast ekstravazasyonu görülmesi kaçak şüphesini destekleyebilir.
Uygun enterik kontrast verilmişse bağırsak lümeninden peritona veya cerrahi yatağa kontrast ekstravazasyonu
Postoperatif BT'de bağırsak dilatasyonu, ileal duvar kalınlaşması ve hafif serbest sıvı eşlik edebilir.
CO₂ insuflasyonu kullanılan cerrahi sonrasında cilt altı amfizemi gaz göçüne eşlik edebilir.
Enterik kontrastın lümen dışına çıkışı perforasyon lehine bulgudur; negatif oral kontrastlı BT, gizli veya kapalı perforasyonu dışlamayabilir.

Normalde

Ameliyat sonrası az miktarda intraperitoneal hava görülebilir; pnömoperitoneum genel olarak gastrointestinal perforasyon işareti kabul edilir. Postoperatif kıyasta gazın beklenen giriş/ameliyat yatağına göre konumu, eşlik eden sıvı ve önceki BT'ye göre hacim değişimi değerlendirilir.

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 s0119; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

İntestinal pnömatozis: gaz bağırsak duvarı içinde izlenir.
Portal venöz gaz: damar içinde izlenen gazdır; ekstraluminal serbest gazdan damar içi yerleşimiyle ayrılır.
Postoperatif serbest hava BT'de görülebilir; seri incelemelerde ilerlemesi gizli bağırsak perforasyonu şüphesini artırır.
Anastomoz veya cerrahi hat kaçağında BT'de oral kontrast ekstravazasyonu ve komşu koleksiyon görülebilir; serbest hava tek başına perforasyonu kanıtlamaz.

Tuzaklar

Ameliyat sonrası serbest hava tek başına kaçak tanısı koydurmaz; zaman içindeki seyir ve eşlik eden sıvı bulgularıyla birlikte değerlendirilir.
Laparoskopi sonrası cilt altı hava ve sınırlı peritoneal gaz cerrahi erişimle ilişkili olabilir; havanın periton, karın duvarı veya bağırsak duvarı içinde olduğunu ayır.
Enterik kontrast kullanılmışsa BT'de lümen dışına çıkışını araştır; ekstravazasyon perforasyon lehine bulgudur.
Tek bir zaman noktasındaki hava miktarı süreç hakkında sınırlı bilgi verir; eski görüntüler yoksa raporda değişim eğilimi varsayma.
Sezaryen sonrası az miktarda intraperitoneal hava görülebilir; hemen postoperatif dönem sonrasında sürmesi veya ilerlemesi olağandışıdır ve içi boş organ yaralanmasını düşündürebilir.

Kendini dene

Sezaryen sonrası BT'de seri incelemelerde ilerleyen pnömoperitoneum saptanıyor. En uygun yorum hangisidir?
Cevabı göster
Gizli bağırsak yaralanması şüphesini artırır. Sezaryen sonrası ilerleyen pnömoperitoneum, kontrast çalışması negatif olsa bile gizli bağırsak perforasyonu şüphesini artırmalıdır.
Enterik kontrast anastomozdan peritoneal koleksiyona geçiyor. Serbest havaya eşlik eden en güçlü açıklama nedir?
Cevabı göster
Anastomoz kaçağı. Lümen dışına uzanan enterik kontrast kaçağı doğrudan gösterir. Beklenen serbest hava kontrast ekstravazasyonunu açıklamaz; cilt altı amfizem cilt altı dokuda hava olarak izlenir.

İlgili konular

Kaynaklar

Bu sayfadaki 37 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 18 cümle bu karşılaştırmada düzeltildi (2026-10-10).

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