Why did Mr. Stone develop heart failure? The patient is a 60-year-old male who has hypertension and heart failure. He had Hydrochlorothiazide prescribed by MD for his hypertension a couple of years ago. However, the patient has not taken the medications as directed. He complains that he is experiencing increasing fatigue, shortness of breath, paroxysmal nocturnal dyspnea and weight gain. An ECG and a chest x-ray were performed and also had blood drawn. The patient is alert and oriented. His bp was 168/96 mmHg, the temperature was 98.4, pulse 98/min and RR was 22/min. Oxygen saturation 90% on room air and increased to 94% with oxygen at 2 liters/min, per nasal cannula. The nurse administered Enalapril 5 mg PO.