Azelnidipine Anti-Coronary Atherosclerotic Trial in Hypertensive Patients by Serial Volumetric IVUS Analysis(ALPS-J)

Inclusion Criteria: * Age: Between 20 and 79 years (at the time of giving informed consent). * Sex: Either sex. * Admission status: Outpatients. * Patients requiring treatment for hypertension according to the JSH 2004 hypertension therapy guidelines before beginning this study * Patients who have not used any calcium antagonists for at least 4 weeks before the beginning of this study. * Patients who are scheduled to undergo elective PCI. Exclusion Criteria: * Patients with acute coronary syndrome (ACS). * Patients who have experienced Q-wave myocardial infarction within 4 weeks before beginning this study. * Patients with renal dysfunction (serum creatinine \>2.0 mg/dL). * Patients in whom PCI is unsuccessful. * Patients with cardiogenic shock. * Patients with moderate or severe congestive heart failure. * Patients with 50% or more stenosis of the main trunk of the left coronary artery. * Patients with other problems whom the investigator considers unsuitable for this study.