The hospitalized patient is found unresponsive and the cardiopulmonary monitor shows ventricular fibrillation. Upon assessment, no pulse or respiratory effort are appreciated. A code blue is called and the defibrillator is being brought to the room. Which initial intervention is appropriate?

The mother of the 7-week-old infant reports the baby has had fewer and fewer wet diapers and hasn’t stooled in 3 days despite having a ravenous appetite. The mother reports that the child has been vomiting with increasing force and volume over the past two weeks. The emesis just appears to be partially digested breastmilk and fluid. The infant appears well, but mucous membranes are dry, the child has a low-grade fever, and is tachycardic. Upon palpation of the abdomen, a small, olive-shaped mass is appreciated. A serum electrolyte panel reveals a sodium of 132, potassium of 2.7, chloride of 89, and a glucose of 92. The nurse performs which nursing action first? 

The 18-year-old patient presents with pallor, shortness of breath, and bleeding from the gums. Extensive testing is performed and a diagnosis of very severe aplastic anemia is made. Which additional information is most important to direct treatment?