EKG. Case study# 1

Mr. Johnson, a 72-year-old male, presents to the emergency department in the morning with a chief complaint of palpitations and dizziness that started about 2 days ago. He has a medical history of hypertension, hyperlipidemia, and chronic kidney disease. The patient mentions that he is on diuretics and has recently not been eating well. He denies any chest pain, shortness of breath, or syncope. An EKG is immediately ordered.

Based on Mr. Johnson's clinical presentation and medical history, what is the likely underlying cause for the observed QT segment prolongation on the EKG?

Mr. Johnson, a 72-year-old male, presents to the emergency department with a chief complaint of palpitations and dizziness that started about 2 days ago. He has a medical history of hypertension, hyperlipidemia, and chronic kidney disease. The patient mentions that he is on diuretics and has recently not been eating well. He denies any chest pain, shortness of breath, or syncope. An EKG is immediately ordered.
Four hours after and before you can start the treatment that you anticipate, a new EKG is ordered, shown here, and the next immediate nursing action  will be: Select all that apply

Mr. Johnson, a 72-year-old male, presents to the emergency department with a chief complaint of palpitations and dizziness that started about 2 days ago. He has a medical history of hypertension, hyperlipidemia, and chronic kidney disease. The patient mentions that he is on diuretics and has recently not been eating well. He denies any chest pain, shortness of breath, or syncope. An EKG was immediately ordered.
At 1900 hours, a new EKG was received. According to this new status of evolution, What is the first-line treatment at this moment?

Mr. Johnson, a 72-year-old male, presents to the emergency department with a chief complaint of palpitations and dizziness that started about 2 days ago. He has a medical history of hypertension, hyperlipidemia, and chronic kidney disease. The patient mentions that he is on diuretics and has recently not been eating well. He denies any chest pain, shortness of breath, or syncope. 
Despite the efforts, the next day, Mr. Johnson goes into ventricular fibrillation.
What are the most two appropriate initial interventions?

Mr. Johnson, a 72-year-old male, presents to the emergency department with a chief complaint of palpitations and dizziness that started about 2 days ago. He has a medical history of hypertension, hyperlipidemia, and chronic kidney disease. The patient mentions that he is on diuretics and has recently not been eating well. He denies any chest pain, shortness of breath, or syncope. 
After stabilizing Mr. Johnson, the nurse reviews his medications and realizes that he has been prescribed a new drug that could potentially prolong the QT interval.
What is the most appropriate nursing action regarding this finding?

Due to Mr. Johnson's prolonged QT and subsequent cardiac events, his family is considering legal action against the healthcare provider who prescribed the potentially offending medication. As the primary nurse, what is your initial step in response to this situation?