Akut Mezenterik Vasküler Hastalıklar
Özet
Akut mezenterik vasküler hastalıklar, bağırsakların metabolik gereksinimlerinin karşılanamaması sonucu gelişen ani hipoperfüzyon tablolarıdır. Bu durum akut mezenterik iskemi (arteriyel emboli, tromboz ve non-okluziv iskemi) ve mezenterik ven trombozu olmak üzere farklı klinik mekanizmalarla ortaya çıkar. Arteriyel oklüzyonlar sıklıkla aterosklerotik hastalıklara veya kardiyak kökenli embolilere bağlı gelişirken; non-okluziv mezenterik iskemi (NOMI) genellikle kritik hastalarda vazokonstriksiyona ve düşük debiye sekonder oluşur. Mezenterik ven trombozu ise hiperkoagülabiliti ve lokal inflamatuar süreçlerle ilişkilidir. Klinik prezentasyonda fizik muayene bulgularıyla uyumsuz, ani başlayan şiddetli karın ağrısı klasiktir ve metabolik asidoz tanıyı güçlü şekilde destekler. Tanıda altın standart yüksek çözünürlüklü bilgisayarlı tomografik (BT) anjiyografidir. Tedavi yaklaşımı; hastanın oral alımının kesilmesi, agresif IV hidrasyon, geniş spektrumlu antibiyotik ve sistemik antikoagülasyonu içerir. Peritoneal irritasyon bulguları veya ilerlemiş iskemi varlığında acil cerrahi eksplorasyon, revaskülarizasyon (embolektomi/bypass) ve nekrotik bağırsak rezeksiyonu zorunludur. Gelişen agresif multimodal yönetim stratejilerine rağmen, tanıdaki gecikmeler ve altta yatan komorbiditeler nedeniyle bu hastalık grubu, özellikle NOMI formu olmak üzere, %50'yi aşan perioperatif mortalite oranlarıyla oldukça yüksek morbidite ve mortalite riskine sahiptir.
Acute mesenteric vascular diseases represent sudden-onset intestinal hypoperfusion conditions arising when the metabolic demands of the bowel exceed the mesenteric blood supply. This clinical spectrum is primarily classified into acute mesenteric ischemia (comprising arterial embolism, thrombosis, and non-occlusive mesenteric ischemia) and mesenteric venous thrombosis. While acute arterial occlusions typically stem from underlying atherosclerotic disease or thromboembolism of cardiac origin, non-occlusive mesenteric ischemia (NOMI) develops secondary to severe splanchnic vasoconstriction in critically ill patients. Mesenteric venous thrombosis is predominantly associated with systemic hypercoagulable states and local intra-abdominal inflammation. The hallmark clinical presentation is acute, severe abdominal pain disproportionate to physical examination findings, frequently accompanied by metabolic acidosis. High-resolution computed tomography (CT) angiography stands out as the definitive diagnostic tool. Initial medical management requires immediate cessation of oral intake, aggressive intravenous fluid resuscitation, broad-spectrum antibiotics, and systemic anticoagulation. The presence of peritoneal signs or advanced ischemia mandates emergent surgical exploration, surgical revascularization via embolectomy or bypass, and resection of necrotic bowel segments. Despite modern treatment modalities, this disease spectrum carries exceptionally high morbidity and mortality rates, often exceeding 50% perioperatively, driven by diagnostic delays and significant patient comorbidities.
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