Covid-19 ve Mekanik Ventilatör Modları
Özet
COVID-19 pandemisi, dünya genelinde milyonlarca insanı etkileyerek ağır pnömoni ve akut solunum sıkıntısı sendromu (ARDS) vakalarında ciddi bir artışa neden olmuştur. Bu süreçte, özellikle yoğun bakım ünitelerinde mekanik ventilasyon desteğine duyulan ihtiyaç kritik bir seviyeye ulaşmıştır. COVID-19 kaynaklı solunum yetmezliği, Berlin tanımına uysa da yüksek hipoksemiye rağmen solunum mekaniğinin korunmasıyla tipik ARDS'den ayrılan kendine özgü özellikler sergilemektedir. Hastalarda hipoksemi mekanizmalarını açıklamak için L (düşük elastans ve ağırlık) ve H (yüksek elastans ve ağırlık) olmak üzere iki farklı fenotip tanımlanmıştır. Tedavi yaklaşımında, invaziv mekanik ventilasyona geçişte gecikilmemesi ve akciğer koruyucu ventilasyon stratejilerinin uygulanması hayati önem taşımaktadır. Bu kapsamda tidal volümün 4-8 ml/kg aralığında tutulması, plato basıncının 30 cmH2O'nun altında olması ve optimum PEEP düzeyinin belirlenmesi önerilmektedir. Geleneksel SIMV ve PSV modlarının yanı sıra, oksijenasyonun zor sağlandığı vakalarda APRV, Ters Oranlı Ventilasyon (IRV) ve Yüksek Frekanslı Ventilasyon (YFV) gibi alternatif veya kurtarıcı modlar da klinik duruma göre tercih edilebilmektedir. Sonuç olarak, barotravmadan kaçınan ve hastanın fizyolojik ihtiyaçlarına uyum sağlayan kişiselleştirilmiş ventilasyon stratejileri mortaliteyi azaltmada temel unsurdur.
The COVID-19 pandemic has affected millions of people worldwide, leading to a significant increase in cases of severe pneumonia and acute respiratory distress syndrome (ARDS). During this period, the need for mechanical ventilation support in intensive care units reached a critical level. Respiratory failure caused by COVID-19, while meeting the Berlin definition, differs from typical ARDS by specific features, such as the preservation of respiratory mechanics despite severe hypoxemia. Two different phenotypes, L (low elastance and weight) and H (high elastance and weight), have been defined to explain the mechanisms of hypoxemia in patients. In the treatment approach, it is vital not to delay the transition to invasive mechanical ventilation and to implement lung-protective ventilation strategies. In this context, it is recommended to maintain tidal volume between 4-8 ml/kg, keep plateau pressure below 30 cmH2O, and determine the optimum PEEP level. In addition to traditional SIMV and PSV modes, alternative or rescue modes such as APRV, Inverse Ratio Ventilation (IRV), and High-Frequency Ventilation (HFV) can be preferred based on the clinical situation in cases where oxygenation is difficult to achieve. In conclusion, personalized ventilation strategies that avoid barotrauma and adapt to the patient's physiological needs are essential elements in reducing mortality.
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