The nurse overhears a colleague preparing a dose of naltrexone. The nurse offers to assist and ensures the colleague takes which actions? Select all that apply.  

The patient is receiving parenteral nutrition while NPO for a bowel obstruction. Review the patient’s lab results and decide which change to the parenteral nutrition the nurse clarifies with the provider.   Blood urea nitrogen = 34 mg/dL   Serum Creatinine = 2.1 mg/dL  Potassium = 6.1 mEq/dL  Sodium = 131 mEq/dL  Chloride = 100 mEq/dL  Bicarbonate = 18 mEq/dL

The nurse is caring for a patient with schizophrenia who has bacterial endocarditis secondary to intravenous drug use. The patient’s antipsychotic medication is changed from risperidone to clozapine. Within days, the patient develops a serious cardiac arrhythmia. The nurse attributes the patient’s arrhythmia to which cause?