The patient is brought to the emergency department after sudden onset slurring of the words, confusion, and right-sided weakness that started 3 hours ago. Aspirin was given by emergency response. He has a history of diabetes mellitus, hypertension, and hyperlipidemia for which he is compliant with therapy. He smokes 2 packs of cigarettes per day. Upon assessment, the patient’s temperature is 37.4°C, heart rate is 118 bpm, and blood pressure is 204/118 mmHg.  A stat computed tomography (CT) scan shows an area of hyperechogenicity on the left side of the brain. The nurse prepares to provide which medication?  

The 24-year-old patient presents with flu-like symptoms and a diffuse maculopapular rash across her chest, trunk, and palms of the hands. Upon palpation, cervical lymph nodes are enlarged. The patient uses intravenous drugs and reports having unprotected sex. The patient’s labs are notable for negative HIV test, positive human chorionic gonadotropin test, and positive rapid plasma reagin test. The patient reports a history of anaphylaxis with penicillin administration. The nurse educates the patient about which treatment? 

The patient is being treated with intravenous quinidine for malaria that was contracted while in Africa. Several hours after administration of the medication, the patient develops palpitations and dizziness. Electrocardiogram shows tachycardia and twisting of the QRS complexes around an isoelectric line. Which best describes the most likely etiology of this patient’s arrhythmia?