Final answer:
For a client with an AAA less than 3cm, regular ultrasound monitoring every 6 months is the prescribed treatment to track the size and growth of the aneurysm.
Step-by-step explanation:
The medical treatment prescribed for a client with an abdominal aortic aneurysm (AAA) that is less than 3cm typically involves conservative management, including regular monitoring to track the aneurysm's size and growth rate. In this scenario, the most appropriate treatment would be ultrasound every 6 months. This non-invasive test helps in keeping a close watch on the aneurysm to determine if it is getting bigger and at what speed. An aneurysm's growth rate can inform decisions about when more aggressive treatments may be needed. Repair of the AAA would generally not be recommended until it reaches a size where the risk of rupture is greater, or if it's growing quickly.