This study aimed to evaluate the role of the cardio-ankle vascular index (CAVI) in evaluating arterial stiffness changes, the degree of atherosclerosis in patients with hypertension after 1 year of treatment and analysis the correlation between CAVI and cardiovascular risk factors.

Inclusion Criteria:

• Patients have never been diagnosed with hypertension.
• Patients have been diagnosed with primary hypertension, but not take any treatment

Exclusion Criteria:

• Cases with non-primary hypertension or suffering from cardiovascular complications such as myocardial infarction, cerebral stroke, vascular disease, severe heart failure (EF<1) in the time of measurement.

The eligible patients were prospectively monitored to evaluate CAVI in hypertension treatment for every 3 months. All participants will be asked directly medical history, clinical examination and performed blood pressure measurement thoroughly. All clinical information will be retained in medical record.