Table 3.

Development of the Lung Ultrasound-Acute Respiratory Distress Syndrome Score

Variable	β (95% CI)	P Value	LUS-ARDS Points
Left LUS aeration score (0–18)	0.25 (0.10, 0.41)	0.002	+2.5 per unit
Right LUS aeration score (0–18)	0.11 (−0.06, 0.28)	0.185	+1 per unit
No. of anterolateral regions with pleural line abnormalities (0–8)	0.34 (0.07, 0.61)	0.013	+3.5 per unit
LUS-ARDS score = 2.5 × left LUS aeration score + 1 × right LUS aeration score + 3.5 × no. of anterolateral regions with an abnormal pleural line
Examples from the present study	Patient presenting with extrapulmonary sepsis and scored as certain ARDS by the expert panel (Figure E9) •Left and right LUS aeration score were 9 and 11, respectively. •Eight anterolateral lung regions showed an abnormal pleural line. •LUS-ARDS score: 2.5 × 9 + 1 × 11 + 3.5 × 8 = 62
	Patient presenting with cardiac arrest and scored as certain no ARDS by the expert panel (Figure E10) •Left and right LUS aeration scores were 0 and 4, respectively. •No anterolateral lung regions showed an abnormal pleural line. •LUS-ARDS score: 2.5 × 0 + 1 × 4 + 3.5 × 0 = 4

Definition of abbreviations: ARDS = acute respiratory distress syndrome; CI = confidence interval; LUS = lung ultrasound.