The Jugular Vein Ultrasonography for Hydration Assessment in Healthy Participants

"Protocol 1: IJV tapering portion is portrayed in a transverse view. With a skin marker, the IJV height is marked and measured as soon as IJV is smaller than CCA throughout the whole respiratory cycle.~Protocol 2: IJV tapering portion is portrayed in a transverse view. With a skin marker, the IJV height is marked and measured as soon as IJV is completely collapsed throughout the whole respiratory cycle.~Protocol 3: IJV tapering portion is portrayed in a longitudinal view. With a skin marker, the IJV height at the end of expiration is marked and measured at the following two positions:~1. Measurement 1: at the very end of the tapering portion (collapsing point / top of pulsation).~2. Measurement 2: at the beginning of the tapering portion (taper point)."