Table 1. Description of diagnostic criteria used to define fluid overload.

Study (year)	Chest X-ray	Lung ultrasound
Tang and Hsieh 19 (2017)	Pulmonary vascular congestion and pulmonary interstitial infiltration	B-lines arising from the pleural line, assessed qualitatively
Cantinotti et al 21 (2018)	Pulmonary vascular congestion and pulmonary interstitial infiltration	B-lines arising from the pleural line, assessed quantitatively
Gupta et al 20 (2018)	Unspecified	Unspecified
Girona-Alarcon et al 22 (2020)	Pulmonary interstitial infiltration	B-lines arising from the pleural line, assessed quantitatively; and presence of pleural effusion