Akut Karaciğer Yetmezliği
Özet
Akut karaciğer yetmezliği (AKY), kronik karaciğer hastalığı öyküsü olmayan bireylerde aniden gelişen, koagulopati (INR ≥ 1.5) ve hepatik ensefalopati ile karakterize, multiorgan yetmezliğine yol açabilen ve yüksek mortalite riski taşıyan acil bir klinik tablodur. Hastalığın en sık nedenleri batı ülkelerinde ilaca bağlı hasarlar (özellikle parasetamol) iken, gelişmekte olan bölgelerde viral hepatitlerdir. Tanı klinik ve laboratuvar bulgularına dayanır; prognozun belirlenmesinde etiyoloji, yaş ve ensefalopati derecesi ile birlikte King’s Kolej Kriterleri ve MELD skoru gibi sistemler kritik rol oynar. Tedavi yaklaşımı; hemodinamik resüsitasyon, serebral ödem ve enfeksiyon gibi nörolojik ve sistemik komplikasyonların agresif yönetimi ile plazma değişimini içerir; spontan iyileşme öngörülemeyen durumlarda ise acil karaciğer transplantasyonu tek efektif seçenektir.
Acute liver failure (ALF) is a critical medical emergency characterized by the rapid development of hepatic encephalopathy and coagulopathy (INR ≥ 1.5) in patients without pre-existing chronic liver disease, often cascading into catastrophic multiorgan failure. The primary etiological drivers vary geographically, with drug-induced liver injury, particularly acetaminophen overdose, dominating in Western countries, whereas viral hepatitis remains prevalent in Asia and Africa. Diagnosis relies heavily on clinical and laboratory findings, while prognostic evaluations utilizing specialized models like the King’s College Criteria and MELD score are crucial to guide therapeutic interventions. Management strategies focus on comprehensive intensive care protocols to mitigate severe complications, including cerebral edema, hemodynamic instability, and secondary infections, alongside therapeutic plasma exchange; crucially, for patients with low probability of spontaneous recovery, emergent liver transplantation stands as the definitive life-saving intervention.
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