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Clearly, types L and H are the conceptual extremes of a spectrum that includes intermediate stages, in which their characteristics may overlap. These can be defined as “type H,” with extensive CT consolidations, high elastance (low compliance), higher lung weight, and high PEEP response. 6 For many patients, the disease may stabilize at this stage without deterioration while others, either because of disease severity and host response or suboptimal management, may transition to a clinical picture more characteristic of typical ARDS. These patients can be assigned, in a simplified model, to “type L,” characterized by low lung elastance (high compliance), lower lung weight as estimated by CT scan, and low response to PEEP. Many patients do not appear overtly dyspneic. Infiltrates are often limited in extent and, initially, are usually characterized by a ground-glass pattern on CT that signifies interstitial rather than alveolar edema. 1, 2 Minute ventilation is characteristically high. Soon after onset of respiratory distress from COVID, patients initially retain relatively good compliance despite very poor oxygenation. Shared Decision Making and Communication.Scientific Discovery and the Future of Medicine.Health Care Economics, Insurance, Payment.Clinical Implications of Basic Neuroscience.Challenges in Clinical Electrocardiography.
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