Type L and Type H patients are best identified by CT scan and are affected by different pathophysiological mechanisms. If not available, signs which are implicit in Type L and Type H definition could be used as surrogates: respiratory system elastance and recruitability.

Understanding the correct pathophysiology is crucial to establishing the basis for appropriate treatment.

Given this conceptual model, it follows that the respiratory treatment offered to Type L and Type H patients must be different.

The proposed treatment is consistent with what observed in COVID-19, even though the overwhelming number of patients seen in this pandemic may limit its wide applicability.

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