A 72-year-old woman with known stable heart failure (NYHA Class II) is admitted with increasing shortness of breath and ankle swelling over the past week. Her current medications include ramipril, bisoprolol, and furosemide 40mg OM. On examination, JVP is elevated, bilateral crepitations are heard at lung bases, and she has pitting oedema to her knees. What is the most appropriate initial change to her medication in addition to supportive care?