Table 2.

Summaries of PoCUS Protocols

	Date Introduced for COVID19	Authors	Pulmonary assessment	Lung zones	Cardiac assessment	Vascular assessment	Details (Position, transducer, system examined, time required)		Population studied
End SBT Protocol [59]	March 12th, 2020	Peng et al.	✓	12				Originally for patients with postextubation distress Upper and lower posterior zones Upper and lower axillary zones Upper and lower anterior zones	20 adult patients at Xiangya Hospital [60]
LUSCOVID Protocol [33]	March 30th, 2020	Soldati et al.	✓	14			10 s per zone Linear/convex transducer Basal, middle and upper paravertebral line Basal and upper midaxillary line Basal and upper midclavicular line		1462 COVID-19 patients across 20 USA/European hospitals [25] 1 pregnant woman with COVID-19 at a tertiary hospital in Rome [40 10 children with COVID-19 at 2 tertiary hospitals in Rome [54] 88 adult COVID-19 patients from 3 Italian hospitals [28]
ASE Protocol [11]	April 15th, 2020	Johri et al.	✓	8–10	✓	✓	Assess ventricles, pericardium and valves Perform an 8–12 zone lung scan Assess the jugular venous pressure (JVP), subcostal inferior vena cava (IVC) and leg veins		77 COVID-19 patients in the Adan General Hospital ICU [28]
DLETE Protocol [61]	April 18th, 2020	Fox et al.	✓	8	✓	✓	10-min examination Linear/phased array transducer Perform a focused ECHO Perform an 8-zone lung scan Assess the IVC and leg veins for DVTs		–
CLUE Protocol [6]	May 9th, 2020	Manivel et al.	✓	12			Upright position Linear/convex transducer Upper and lower posterior zones Upper and lower lateral zones Upper and lower anterior zones		–
BLUEa Protocol [57]	May 15th, 2020	Karagöz et al.	✓	12			Upright position Upper and lower posterior zones Upper and lower axillary zones Upper and lower anterior zones		20 adult patients at Xi’an Chest Hospital [58]
Six Zone Protocol [30]	June 12th, 2020	Antúnez-Montes et al.	✓	6			Upright/prone position Linear/curvilinear transducer Bilateral posterior, lateral superior, and lateral inferior zones		38 COVID-19 patients in Tongji Hospital, Wuhan [29]

^aThe BLUE protocol was initially introduced by Lichtenstein et al., however, was first outlined for its use in COVID-19 by Sultan et al. [57, 65]