Fig. 1From: Internal jugular vein collapsibility index associated with hypovolemia in the intensive care unit patientsa, b Ultrasound images of the internal jugular vein during respiratory cycle in B mode and M mode. a IJV collapsibility during respiratory cycle with minimum AP diameter (right) maximum AP diameter (left) measured in B mode. b IJV collapsibility during respiratory cycle with maximum and minimum AP diameter measured in M modeBack to article page