Table 2.

Characteristics of COVID-19 pneumonia (CARDS) Type L and H.

COVID-19 Pneumonia, Type L	Property	COVID-19 Pneumonia, Type H
Low	Elastance	High
Normal-to-high	Compliance	Low
Normal	Gas volume	Decreased
Low ventilation-to-perfusion (V/Q) ratio due to vasoplegia and loss of hypoxic vasoconstriction	Primary driver of hypoxia	Right-to-left shunt due to perfusion of non-aerated regions affected by edema and high pressures
Normal-to-low	Lung weight	High
Low with sparse non-aerated regions	Lung recruitability/PEEP response	Increased with more non-aerated regions
Limited interstitial ground-glass opacities along subpleural planes and lung fissures	Computed tomography (CT)	Extensive consolidations