The quantity of VSMCs in arterial media had no significant difference among the three groups.

Light microscopy showed edema in the arterial wall with local necrosis in the media and adventitia, and dilated lymph vessles and later fibrosis in the adventitia and perivascular tissues.

Objective: To study the changing characteristics of intimal plus media thickness (IMT) of carotid arterial wall in middle aged and aged hypertension by means of Color Doppler Ultrasonic examination.