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Medical management of small abdominal aortic aneurysms Baxter BT; Terrin MC; Dalman RLCirculation 2008[Apr]; 117 (14): 1883-9Abdominal aortic aneurysm is a common condition that may be lethal when it is unrecognized. Current guidelines suggest repair as the aneurysm diameter reaches 5.0 to 5.5 cm. Most aortic aneurysms are detected incidentally when imaging is done for other purposes or through screening programs. Ninety percent of these aneurysms are below the threshold for intervention at the time of detection. A number of studies have sought to determine factors that lead to progression of aneurysmal disease that might be amenable to intervention during this period of observation. We review these studies and make recommendations for the medical management of small abdominal aortic aneurysms. On the basis of our current knowledge of the causes of aneurysm, a number of approaches have been proposed to prevent progression of aneurysmal disease. These include hemodynamic management, inhibition of inflammation, and protease inhibition. The American College of Cardiology/American Heart Association clinical practice guidelines rules of evidence have helped to define strength of evidence to support these approaches. Level A evidence (from large randomized trials) is available to indicate that observation of small aneurysms in men is safe up to a size of 5.5 cm and that propranolol does not inhibit aneurysm expansion. Level B evidence (from small randomized trials) suggests that roxithromycin or doxycycline will decrease the rate of aneurysm expansion. A number of studies agree that tobacco use is associated with an increased rate of aneurysm expansion. Level B and C evidence is available to suggest that 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors (statins) may inhibit aneurysm expansion. There are animal data but no human data demonstrating that angiotensin-converting enzyme inhibitors or losartan, an angiotensin receptor blocker, will decrease the rate of AAA expansion. A pharmacological agent without important side effects that inhibited aneurysm expansion could change current approaches to aneurysm treatment. Additional studies are needed to clarify the potential role of doxycycline, roxithromycin, and statin therapy in the progression of aneurysmal disease.|*Disease Management[MESH]|Adrenergic beta-Antagonists/therapeutic use[MESH]|Angiotensin II Type 1 Receptor Blockers/therapeutic use[MESH]|Angiotensin-Converting Enzyme Inhibitors/therapeutic use[MESH]|Animals[MESH]|Aortic Aneurysm, Abdominal/*drug therapy/surgery[MESH]|Aortic Rupture/prevention & control[MESH]|Disease Progression[MESH]|Doxycycline/therapeutic use[MESH]|Evidence-Based Medicine[MESH]|Humans[MESH]|Hydroxymethylglutaryl-CoA Reductase Inhibitors/therapeutic use[MESH]|Mice[MESH]|Practice Guidelines as Topic[MESH]|Propranolol/therapeutic use[MESH]|Randomized Controlled Trials as Topic[MESH]|Rats[MESH]|Roxithromycin/therapeutic use[MESH]|Smoking/adverse effects[MESH] |
