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Atrial flutter ablation
This treatment uses heat energy to treat a rapid, fluttering heartbeat. Know why and when it's done.
Atrial septal defect (ASD)
This heart problem that is present at birth causes a hole between the heart's upper chambers. It can be treated.
Atrioventricular canal defect
This congenital heart defect involves a hole in the heart. It affects blood flow through the heart valves. Learn the symptoms and how it's treated.
Atypical antidepressants
Bupropion, mirtazapine, nefazodone, trazodone, vilazodone, vortioxetine and esketamine are unique atypical antidepressants, each working in different ways.
Atypical hyperplasia of the breast
Learn how a diagnosis of atypical lobular hyperplasia or atypical ductal hyperplasia affects your risk of breast cancer and what you can do.
Autism spectrum disorder treatment: Can special diets help?
There's no evidence that restrictive diets are an effective treatment for autism spectrum disorder.
Autism treatment: Can chelation therapy help?
Chelation therapy is not an effective autism treatment, and it may be dangerous.
Automated external defibrillators: Do you need an AED?
These potentially lifesaving machines are available without a prescription. Should you get one?
Awake brain surgery
Awake brain surgery is performed while you are awake and alert. This type of brain surgery may be used to treat some brain tumors or epileptic seizures.
BRCA gene test for breast and ovarian cancer risk
Find out what to expect if you're considering a blood test to determine if you have an increased risk of breast cancer. Learn what your results might mean.
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