Atkin-Flaitz syndrome is a rare genetic disorder characterized by intellectual disability, seizures, and facial abnormalities. It is caused by a mutation in the gene that codes for the enzyme dihydropyrimidine dehydrogenase (DPD). Symptoms of Atki...

Atopic dermatitis facts Atopic dermatitis is a type of eczema. The disease may be inherited and genetically determined. The patient's skin may be "super sensitive" to many irritants. Dry, scaly patches ...

Atopic keratoconjunctivitis is a chronic, inflammatory eye condition that affects the cornea and conjunctiva. It is a type of allergic eye disease that is caused by an allergic reaction to environmental allergens such as pollen, dust mites, and an...

ATP13A2-related juvenile neuronal ceroid lipofuscinosis (also known as Kufor-Rakeb Syndrome) is a rare, inherited, neurodegenerative disorder that affects the nervous system. It is caused by mutations in the ATP13A2 gene, which is responsible for ...

ATR-16 Syndrome is a rare genetic disorder caused by a mutation in the ATR gene. It is characterized by intellectual disability, developmental delays, and a variety of physical abnormalities. People with ATR-16 Syndrome may have difficulty with sp...

Atransferrinemia is a rare inherited disorder in which the body is unable to produce enough of the iron-binding protein transferrin. This protein is responsible for transporting iron throughout the body, and without it, iron levels can become dang...

Atresia of the urethra is a rare congenital disorder in which the urethra is abnormally closed or absent. This condition can occur in both males and females, but is more common in males. In males, the urethra is the tube that carries urine from th...

Atrial fibrillation (A-fib) is an irregular and often very rapid heart rhythm (a...

Atrial fibrillation (A-fib) is an irregular and often very rapid heart rhythm (arrhythmia) that can lead to blood clots in the heart. A-fib increases the risk of stroke, heart failure and other he...

Atrial fibrillation (AFib) facts Atrial fibrillation (also referred to as AFib) is the most common type of abnormal heart rhythm. AFib is caused by abnormal electrical discharges (signals) that generate chaotically throughout the upp...

Atrial septal aneurysm (ASA) is a congenital heart defect in which the wall between the two upper chambers of the heart (the atria) is abnormally thickened. This can cause blood to flow between the two chambers, leading to an increased risk of str...

Atrial septal defect, coronary sinus type (ASD-CS) is a rare congenital heart defect in which the atrial septum, the wall between the two upper chambers of the heart, is not completely formed. Instead, there is an opening between the two chambers ...

Atrial septal defect, ostium primum type is a congenital heart defect in which there is a hole in the wall (septum) between the two upper chambers (atria) of the heart. This type of defect is caused by a failure of the septum primum to form proper...

Atrial septal defect, ostium secundum type is a congenital heart defect in which there is a hole in the wall (septum) between the two upper chambers (atria) of the heart. This type of atrial septal defect is the most common type, accounting for ab...

Atrial septal defect, sinus venosus type is a type of congenital heart defect in which there is an abnormal opening between the upper chambers of the heart (the atria). This type of defect is usually located in the upper part of the atrial septum,...

Atrial septal defect-atrioventricular conduction defects syndrome (ASD-AVCD) is a rare genetic disorder characterized by a combination of two heart defects: an atrial septal defect (ASD) and an atrioventricular conduction defect (AVCD). An ASD is ...

Atrial septal defects (ASD) are a type of congenital heart defect in which there is a hole in the wall (septum) between the two upper chambers (atria) of the heart. This hole allows oxygen-rich blood from the left atrium to flow into the right atr...