A 78-year-old man with chronic kidney disease presents to the emergency department because he is feeling unwell. He cannot elaborate any specific symptoms other than generalized malaise. His past medical history also includes heart failure, hypertension, and type 2 diabetes. Medications are ramipril, insulin, furosemide, and metoprolol.On physical examination, the blood pressure is 155/90 mm Hg, heart rate is 100/min, and respiration 24/min. His heart sounds are normal, there is no edema, and the lungs clear on auscultation. An ECG is performed and shown in Figure below. What is the most likely diagnosis based on the ECG findings?