Analisis Respons Imunopatologi Lokal pada Pneumonia Berat yang Mengalami Kematian Akibat Gagal Ekstubasi: Kajian Khusus Peran sTREM, Makrofag Alveolar, IL-6, IL-17, CD4, Treg Foxp3+, Surfactant Protein-A, Caspase-3 = Analysis of Local Immunopathology Responses in Severe Pneumonia with Mortality due to Extubation Failure: Focus on sTREM, Alveolar Macrophage, IL-6, IL-17, CD4, Foxp3+ Tregs, Surfactant Protein-A, and Caspase-3