Fig. 2

Ultrasound lung comets (ULCs) scoring method. A Seven-zones: the anterior zone was delineated from the sternum to the anterior axillary line, and the lateral zone was from the anterior to the posterior axillary line. The anterior and lateral chest walls were subdivided into upper and lower halves with the fourth intercostal space as the boundary from the clavicle to the diaphragm anterior (lower area on the left side was subsequently removed because most of the study population had an enlarged heart which intervened with the area). B Increasing severity of interstitial or alveoli involvement. (a) Normal lung = 0: ULCs are absent. (b) Septal syndrome = 1: ULCs are about 7 mm apart, corresponding to subpleural septa. (c) Interstitial-alveolar syndrome = 2: ULCs are confluent. (d) White lung = 3: ULCs have coalesced, resulting in an almost completely white echographic lung field [14]