the nurse is caring for a client immediately after inserting a picc line. suddenly, the client becomes anxious and tachycardiac, and loud churning is heard over the pericardium upon auscultation. what action should the nurse take first? a. place client in trendelenburg position on the left side. b. administer precordial thump c. monitor the client with a 12-lead electrocardiogram d. request a stat portable chest x-ray.