Which test does the nurse expect will be used to determine the effectiveness of the fosphenytoin dose?

The 21-year-old patient with a body mass index of 10.1 undergoes placement of a peripherally inserted central catheter (PICC) at 1000 and total parenteral nutrition (TPN) is initiated at 1200. At 1600, 160 mL have infused and the patient is noted to be breathing shallowly, there is blood oozing from the PICC insertion site, and the patient is exhibiting confusion. Which action does the nurse perform first? 

The 16-year-old patient passed out from the heat while playing football and now requires an infusion of Lactated Ringer’s solution for moderate dehydration. The patient’s heart rate is 118 bpm, blood pressure is 100/72 mmHg, and temperature is 37.5°C. Which gauge of intravenous catheter does the nurse select for insertion into this patient?