When assessing venous disease in a client's lower extremities, the nurse knows that what test will most likely be prescribed? A. Duplex ultrasonography B. Echocardiography C. Positron emission tomography (PET) D. Radiography {Ans: A. Duplex ultrasonography Rationale: Duplex ultrasound may be used to determine the level and extent of venous disease as well as its chronicity. Radiographs (x-rays), PET scanning, and echocardiography are never used for this purpose as they do not allow visualization of blood flow.}The nurse is caring for an acutely ill client who is on a factor Xa inhibitor. The client has a comorbidity of renal insufficiency. How will this client's renal status affect this anticoagulant therapy? A. The factor Xa inhibitor is contraindicated in the treatment of this client. B. The factor Xa inhibitor may be given subcutaneously, but not intravenously (IV). C. Lower doses of factor Xa inhibitor are required for this client. D. Warfarin will be substituted for the factor Xa inhibitor. {Ans: C. Lower doses of factor Xa inhibitor are required for this client. Rationale: If renal insufficiency exists, lower doses, not contraindication, of factor Xa inhibitors are needed. Warfarin is not an acceptable substitution for this type of medication. There