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A 73 year old woman presents to her GP after checking her blood pressure at home. Her average reading over the past few months is 140/80 mmHg. She is taking a thiazide-type diuretic, a calcium channel blocker, and an angiotensin converting enzyme (ACE) inhibitor. Her ejection fraction is 60%, with diastolic dysfunction on echocardiogram. She has noted some mild lower extremity oedema. She has normal renal function and no other comorbidities of note. She exercises regularly and eats a Mediterranean-style diet. You consider offering a potassium sparing diuretic to treat her heart failure, hypertension, and mild oedema.