While inflating the balloon of a pulmonary artery catheter (PAC) with 1.0 mL of air to obtain a pulmonary artery occlusion pressure (PAOP), the nurse encounters resistance. What is the best nursing action ?   a) add an additional 0.5 mL of air to the balloon and repeat the procedure. b) Advance the catheter with the balloon deflated and repeat the procedure. c) Deflate the balloon and obtain a chest x-ray study to determine line placement. d) Lock the balloon in the inflated position and flush the distal port of the PAC with normal saline     asap

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