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B â Greater than 50% collapse This scenario describes a pt with urosepsis and extreme fluid depletion ⢠⢠⢠⢠In these cases, expect to see greater then 50% collapse (even complete collapse) of the IVC with inspiration IVC plethora is seen in fluid overload states < 50 % collapse during inspiration is normal The âsniff testâ is done when there is no respiratory variation to ensure compliant patent vessels SLRUS