You are in the intensive care unit caring for a patient who is in multiple organ dysfunction syndrome.The patient requires mechanical ventilation, has an arterial line in the right radial artery, and has a Swan-Ganz catheter inserted in the right internal jugular. You notice the central venous pressure is 12 mm Hg. Which of the following reasons may cause the central venous pressure reading of 12 mm Hg? Select all that apply.