2003-1-30 · Swan-Ganz catheterization: Interpretation of tracings. Use of the flow-directed pulmonary artery (or Swan-Ganz) catheter provides the clinician with the ability to measure pressures and sample blood from the right atrium, right ventricle, and pulmonary artery [].Left atrial pressure can also be assessed indirectly from the pulmonary artery wedge (also called pulmonary artery occlusion or ...