title: Position artifacts in occlusive impedance phlebography (plethysmography).
abstract: The accuracy of occlusive impedance phlebography (IPG) depends on recognition of the artifacts that produce false-positive results. Fifty per cent of a series of studies of patients with normal legs showed abnormal results when the recording was made with the leg held straight. We therefore recommend that the patient's leg position be carefully monitored when an IPG test is being administered.
mesh_terms: D003951:Diagnostic Errors; D006801:Humans; D007866:Leg; D010992:Plethysmography, Impedance; D011187:Posture