Supplemental Benefit of Angiotensin Receptor Blocker in Hypertensive Patients With Stable Heart Failure Using Olmesartan

Inclusion Criteria: Patients who meet all of the following criteria. * Patients with NYHA class II through IV chronic heart failure. * Patients who have a history of hypertension or those who have antihypertensive medications. * Patients who are aged 20 years or older and less than 80 years at the entry. * Stable patients who have angiotensin converting enzyme inhibitor and/or beta-blocker. * Patients who do not have angiotensin II receptor blocker. Exclusion Criteria: * Patients who have renal dysfunction (serum creatinine \>=3.0mg/dL) or those who are receiving chronic hemodialysis. * History of drug hypersensitivity to olmesartan. * Patients who have severe liver dysfunction. * History of angioedema. * History of malignant tumor or life-threatening illness of poor prognosis. * Pregnant or possibly pregnant patients. * Cardiovascular surgery within 6months prior to the date of the entry. * Acute myocardial infarction within 6 months prior to the date of the entry. * Percutaneous coronary intervention or stent implantation within 6 months prior to the date of the entry. * Other patients deemed unsuitable as subjects of the study by the treating physician.