Covid-19 Hastalarında Ekstrakorporeal Membran Oksijenizasyonu (ECMO) Uygulamaları
Özet
Ekstrakorporeal Membran Oksijenasyonu (ECMO), konvansiyonel tedavilere dirençli kalp ve akciğer yetmezliği durumlarında kullanılan, kanın vücut dışında oksijenlenmesini sağlayan bir yaşam desteği yöntemidir. Temel çalışma prensibi, drenaj kanülleriyle alınan kanın bir pompa aracılığıyla oksijenatöre (yapay akciğer) gönderilerek karbondioksitten arındırılması ve ardından ısıtılarak vücuda geri verilmesidir. VV-ECMO sadece solunum desteği sağlarken, VA-ECMO hem solunum hem de hemodinamik destek sunar. ECMO'nun temel endikasyonları arasında geri döndürülebilir şiddetli hipoksemik solunum yetmezliği (ARDS), kardiyojenik şok ve masif pulmoner emboli yer alırken; ciddi nörolojik hasar ve son dönem malignite kesin kontrendikasyonlar arasındadır. COVID-19 pandemisinde ECMO, özellikle dirençli ARDS vakalarında kritik bir kurtarma tedavisi olarak öne çıkmıştır. ELSO verilerine göre COVID-19 hastalarında ECMO kullanımı sonrası 90 günlük mortalite oranı yaklaşık %37.4-45 arasındadır. COVID-19 vakalarında hiperkoagülabilite riski nedeniyle antikoagülasyon yönetimi hayati önem taşır; ancak geleneksel yönetim protokollerinden (trakeostomi, ventilatör ayarları vb.) sapılması önerilmemektedir. Sonuç olarak ECMO, uygun hasta seçimi ve deneyimli merkezlerde COVID-19 kaynaklı ağır kardiyopulmoner yetmezlikte etkin bir destek yöntemidir.
Extracorporeal Membrane Oxygenation (ECMO) is a life support method providing temporary respiratory and/or cardiac assistance for patients with failure resistant to conventional treatments. The system functions by draining systemic blood, oxygenating it via an artificial membrane, removing carbon dioxide, and returning it to the body using a pump. While VV-ECMO provides respiratory support for patients with preserved cardiac function, VA-ECMO offers both respiratory and hemodynamic support. Key indications include reversible severe hypoxic respiratory failure (ARDS), cardiogenic shock, and massive pulmonary embolism; however, severe neurological damage and terminal malignancy are absolute contraindications. During the COVID-19 pandemic, ECMO emerged as a vital rescue therapy for refractory ARDS cases. According to ELSO registry data, the estimated 90-day mortality for COVID-19 patients on ECMO is between 37.4% and 45%. In COVID-19 cases, managing anticoagulation is critical due to hypercoagulability risks, yet deviating from standard management protocols regarding ventilation or tracheostomy is not recommended. Consequently, when clinical capacity allows and appropriate patient selection is made, ECMO remains an effective intervention for severe COVID-19-related cardiopulmonary failure.
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