| Summary: | The article presents a theoretical rationale and a clinical case of relief of post-COVID ventilation failure by inhalation of Xe and O-2 gas mixture. Pneumonitis of coronavirus etiology transforms saturated phospholipids of surfactant into a solid-ordered phase, which disrupts surface tension, alveolar pneumatization, and alveolar-capillary gas exchange. Using molecular modeling (B3LYP/lanl2dz; GAUSSIAN09), we demonstrated that Xe atom due to the van der Waals dispersion interaction increases the distance between the phospholipid acyl chains providing a phase transition from the solid-ordered to liquid phase and restored the surface-active monolayer surfactant film. A clinical case confirmed that short-term inhalations of the Xe and O-2 gas mixture relieved manifestations of ventilation insufficiency and increased SpO(2) and pneumatization of the terminal parts of the lungs.
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