Labor and delivery
Learning Center
Automated external defibrillators: Do you need an AED?
These potentially lifesaving machines are available without a prescription. Should you get one?
Atypical genitalia
In this rare condition, a baby's genitals are not clearly male or female. Genitals may not be fully developed or the baby may have features of more than one sex.
Atypical antidepressants
Bupropion, mirtazapine, nefazodone, trazodone, vilazodone, vortioxetine and esketamine are unique atypical antidepressants, each working in different ways.
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.
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.
Atrial flutter ablation
This treatment uses heat energy to treat a rapid, fluttering heartbeat. Know why and when it's done.
Atrial fibrillation ablation
Learn how heat or cold energy can treat an irregular heartbeat called atrial fibrillation (AFib).
Astigmatism
Imperfect curvature of your eye can cause blurred distance and near vision. Learn about this common and treatable eye condition.
Asthma treatment: 3 steps to better asthma control
Follow this three-step approach to keep symptoms under control and prevent attacks.
Asthma medications: Know your options
Learn more about the different categories of medications to help you control asthma symptoms.
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