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Use the A-Z list to browse more than 6,000 health-related topics in our library. Clicking on a term opens the definition and, in most cases, links to more information.
Topic Index
- + AT
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- AT
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A rare, childhood disease that involves progressive loss of coordination and control of movement and also weakens the immune system in most cases. Tiny spider veins (telangiectasia) on the face may be present.
More Information on AT: Pediatric Brain & Nerve
- + Atacand
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- Atacand
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A brand of antihypertensives, medications used to treat high blood pressure (hypertension).
More Information on Atacand: Heart Drug & Medication
- + Ataxia
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- Ataxia
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The loss of coordination, or the inability to control muscle movements. It can occur due to a number of neurological conditions or from other causes (e.g., side effect of medication).
More Information on Ataxia: Neuro Signs & Symptoms
- + Ataxia Telangiectasia
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- Ataxia Telangiectasia
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Also Known As: "AT"
A rare, childhood disease that involves progressive loss of coordination and control of movement and also weakens the immune system in most cases. Tiny spider veins (telangiectasia) on the face may be present.
More Information on Ataxia Telangiectasia: Pediatric Brain & Nerve
- + Ataxic Cerebral Palsy
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- Ataxic Cerebral Palsy
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"Ataxic Cerebral Palsy" is more commonly referred to as "Cerebral Palsy" in the medical community.
Cerebral Palsy
Also Known As: "Spastic Cerebral Palsy"
A group of disorders involving impaired movement control that generally appear in the first few years of life and do not worsen over time. They may be caused by damage to or faulty development of areas of the brain controlling movement and posture.
More Information on Cerebral Palsy: Pediatric Brain & Nerve
- + Ataxic Gait
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- Ataxic Gait
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A broad term that means "inflammation of the joints" but is used to describe any pain that occurs in the joints. Two of the most common forms are osteoarthritis and rheumatoid arthritis.
More Information on Ataxic Gait: Arm & Leg Pain
- + Atelectasis
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- Atelectasis
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Failure of the lung to fully inflate. This may be caused by a number of factors, including tumor growth, a blocked airway, infections and other diseases.
More Information on Atelectasis: Lung & Chest Cancer
- + Atherectomy
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- Atherectomy
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Also Known As: "Coronary Atherectomy, Peripheral Atherectomy, Extractional Atherectomy, Rotational Atherectomy, Transluminal Extraction, Mechanical Rotational Atherectomy, Directional Atherectomy, Directional Coronary Atherectomy"
A broad name for a group of related procedures that remove exceptionally hard (calcified) plaque that has built up on the walls of the arteries.
More Information on Atherectomy: Catheter Tests & Procedures
- + Atheroma
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- Atheroma
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Also Known As: "Atheromatous Plaque"
A mass of plaque that has formed in an artery.
More Information on Atheroma: Cholesterol
- + Atheromatous Plaque
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- Atheromatous Plaque
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A mass of plaque that has formed in an artery.
More Information on Atheromatous Plaque: Cholesterol
- + Atherosclerosis
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- Atherosclerosis
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Also Known As: "Blockage of the Arteries, Narrowing of the Arteries, Hardening of the Arteries"
A disease in which the arteries harden and become narrowed due to the gradual build up of plaque on their inner walls.
More Information on Atherosclerosis: Vascular Disease
- + Atherosclerosis & Diabetes
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- Atherosclerosis & Diabetes
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A disease in which the arteries are hardened and narrowed, due to the gradual buildup of plaque on their inner walls. People with diabetes are at higher risk for this condition.
More Information on Atherosclerosis & Diabetes: Diabetes Heart & Blood Vessel
- + Atherosclerotic Plaque
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- Atherosclerotic Plaque
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"Atherosclerotic Plaque" is more commonly referred to as "Plaque" in the medical community.
Plaque
A material composed of fats (lipids), cholesterol (lipoproteins), calcium and other materials. Its buildup contributes to atherosclerosis and coronary artery disease.
More Information on Plaque: Cholesterol
- + Atherothrombosis
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- Atherothrombosis
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"Atherothrombosis" is more commonly referred to as "Blood Clots" in the medical community.
Blood Clots
Also Known As: "Venous Blood Clot, Thrombus, Thrombi"
A clump of blood that forms in or around a vessel as a result of coagulation (the blood's natural tendency to clump and stick).
More Information on Blood Clots: Blood Clot
- + Athlete Heart
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- Athlete Heart
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"Athlete Heart" is more commonly referred to as "Enlarged Heart" in the medical community.
Enlarged Heart
Also Known As: "Heart Enlargement, Cardiomegaly, Osteochondrodysplasia Syndrome"
A sign that the heart is overworked. When underlying disease or other conditions (e.g., heavy exercise) cause the heart to work harder, the heart enlarges to compensate for the increased need.
More Information on Enlarged Heart: Heart Signs & Symptoms
- + Athlete's Foot
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- Athlete's Foot
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Also Known As: "Tinea Pedis"
Infection of the feet caused by fungus. It often strikes between the toes but can also affect the hands. It is contagious and can be passed through contact with skin, shoes, stockings and shower or pool surfaces.
More Information on Athlete's Foot: Skin Related Infections
- + Athletic Shoe Choices
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- Athletic Shoe Choices
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Infection of the feet caused by fungus. It often strikes between the toes but can also affect the hands. It is contagious and can be passed through contact with skin, shoes, stockings and shower or pool surfaces.
More Information on Athletic Shoe Choices: Exercise & Weight
- + Athletic Shoe Choices & Diabetes
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- Athletic Shoe Choices & Diabetes
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It is especially important for people with diabetes to choose athletic shoes that fit them properly since diabetes increases the risk of calluses, skin ulcers and other foot-related problems.
More Information on Athletic Shoe Choices & Diabetes: Diabetes Diet & Fitness
- + ATLL
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- ATLL
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"ATLL" is more commonly referred to as "Adult T Cell Leukemia Lymphoma" in the medical community.
Adult T Cell Leukemia Lymphoma
An aggressive type of non-Hodgkin's lymphoma that is market by enlarged lymph nodes, liver and spleen along with skin and bone lesions and an elevated calcium level.
More Information on Adult T Cell Leukemia Lymphoma: Leukemia & Bone Cancer
- + Atomoxetine
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- Atomoxetine
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"Atomoxetine" is more commonly referred to as "Methylphenidate" in the medical community.
Methylphenidate
Also Known As: "Dexmethylphenidate, Dextroamphetamine"
A type of medication used in the treatment of attention deficit hyperactivity disorder (ADHD).
More Information on Methylphenidate: Psychiatric Medications
- + Atonic Colon
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- Atonic Colon
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Also Known As: "Lazy Bowel Syndrome, Atonic Constipation, Lazy Colon"
A lack of normal muscle tone or strength in the colon that keeps food from traveling through the colon, causing chronic constipation. Overuse of laxatives or Hirschsprung's disease may cause it.
More Information on Atonic Colon: Digestive Health Basics
- + Atonic Constipation
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- Atonic Constipation
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Also Known As: "Lazy Bowel Syndrome, Lazy Colon"
A lack of normal muscle tone or strength in the colon that keeps food from traveling through the colon, causing chronic constipation. Overuse of laxatives or Hirschsprung's disease may cause it.
More Information on Atonic Constipation: Digestive Health Basics
- + Atonic Seizures
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- Atonic Seizures
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Also Known As: "Akinetic Seizures, Drop Attacks, Astatic Seizures"
A type of generalized seizure that causes an abrupt loss of muscle tone. This leads to sudden collapse, posture loss or head drop. They occur without warning and those affected fall hard, risking head injury.
More Information on Atonic Seizures: Epilepsy & Seizure
- + Atopic Dermatitis
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- Atopic Dermatitis
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Also Known As: "Inherited Dermatitis, Genetic Dermatitis"
The type of eczema (chronic, itchy inflammation of the upper layers of the skin) caused by allergies. Often appears during infancy, usually disappearing by the age of 3 or 4.
More Information on Atopic Dermatitis: Dermatitis, Eczema & Hives
- + Atopic Keratoconjunctivitis
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- Atopic Keratoconjunctivitis
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Also Known As: "Flare-Up Around Eyes"
A type of allergic conjunctivitis that is associated with atopic dermatitis of the eyelids and face. Symptoms can be sight-threatening and may include redness, burning, tearing and itching.
More Information on Atopic Keratoconjunctivitis: Eye Conditions
- + Atopy
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- Atopy
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Genetic tendency to develop allergic diseases, such as allergic rhinitis, asthma and atopic dermatitis. Usually associated with inhaled allergens and food allergens.
More Information on Atopy: Allergy Basics
- + Atorvastatin
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- Atorvastatin
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"Atorvastatin" is more commonly referred to as "Lipitor" in the medical community.
Lipitor
A brand name medication (generic atorvastatin) belonging to a class of drugs called statins -- cholesterol-reducing medications used in the treatment of high cholesterol.
More Information on Lipitor: Heart Drug & Medication
- + ATP
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- ATP
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"ATP" is more commonly referred to as "Adenosine Triphosphate" in the medical community.
Adenosine Triphosphate
A substance present in all living cells that provides energy for many metabolic processes.
- + ATP CP Energy System
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- ATP CP Energy System
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Also Known As: "Adenosine Triphosphate Creatine Phosphate Energy System"
The metabolic sequence used by the body to provide the muscles with energy through muscular contractions. Adenosine triphosphate (ATP) is stored in muscle cells. Creatine phosphate (CP) replenishes ATP when depleted.
- + ATRA
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- ATRA
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"ATRA" is more commonly referred to as "All Trans Retinoic Acid" in the medical community.
All Trans Retinoic Acid
Also Known As: "Tretinoin"
A form of vitamin A most commonly used for the treatment acne or the prevention of aging. It may also be used in combination with chemotherapy to treat acute promyelocytic leukemia and is being tested for use in the treatment of other cancers.
More Information on All Trans Retinoic Acid: Cancer Drug & Medication
- + Atresia
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- Atresia
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An absence or closure of an opening in the body, such as in the esophagus, intestines or anus.
More Information on Atresia: Digestive Health Basics
- + Atria
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- Atria
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Also Known As: "Left Atrium, Right Atrium"
One of two upper chambers of the heart. Oxygen-poor blood travels from the right atrium to the right ventricle and out to the lungs. Oxygen-rich blood travels from the left atrium to the left ventricle and out to the body.
More Information on Atria: Heart Basics
- + Atrial Aneurysm
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- Atrial Aneurysm
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Also Known As: "Atrial Septal Aneurysm, Aneurysm of Septum Secundum, Left Atrial Aneurysm, Right Atrial Aneurysm, Aneurysm of Septum Primum"
Bulging of part of the wall of an atrium. When in the wall between atria, it is called atrial septal aneurysm or aneurysm of septum primum (or secundum). It is often congenital and has been linked to increased stroke risk and patent foramen ovale.
More Information on Atrial Aneurysm: Aneurysm
- + Atrial Ectopics
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- Atrial Ectopics
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"Atrial Ectopics" is more commonly referred to as "Premature Atrial Contractions" in the medical community.
Premature Atrial Contractions
Also Known As: "PAB, PAC, Premature Supraventricular Contractions, Premature Atrial Beats, Atrial Extrasystoles"
A harmless irregular heart rhythm that does not need to be treated. It is often due to stress or excessive use of substances such as caffeine. It occurs when one of the heart's upper chambers contracts prematurely in the heartbeat cycle.
More Information on Premature Atrial Contractions: Arrhythmia
- + Atrial Extrasystoles
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- Atrial Extrasystoles
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"Atrial Extrasystoles" is more commonly referred to as "Premature Atrial Contractions" in the medical community.
Premature Atrial Contractions
Also Known As: "PAB, PAC, Premature Supraventricular Contractions, Premature Atrial Beats, Atrial Ectopics"
A harmless irregular heart rhythm that does not need to be treated. It is often due to stress or excessive use of substances such as caffeine. It occurs when one of the heart's upper chambers contracts prematurely in the heartbeat cycle.
More Information on Premature Atrial Contractions: Arrhythmia
- + Atrial Fibrillation
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- Atrial Fibrillation
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Also Known As: "AF, Transient Atrial Fibrillation, A-Fib, Lone Atrial Fibrillation"
A rapid, irregular heart rhythm caused by abnormal electrical impulses that begin in the upper chambers of the heart (atria). As a result, the heart's lower chambers (the ventricles) beat rapidly and irregularly.
More Information on Atrial Fibrillation: Arrhythmia
- + Atrial Flutter
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- Atrial Flutter
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A rhythm that is closely related to atrial fibrillation is atrial flutter, in which a very rapid but regular electrical signal in the atria causes a very rapid heartbeat.
More Information on Atrial Flutter: Arrhythmia
- + Atrial Myxoma
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- Atrial Myxoma
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"Atrial Myxoma" is more commonly referred to as "Cardiac Myxoma" in the medical community.
Cardiac Myxoma
Also Known As: "Myxoma"
A rare, mucus-filled tumor (myxoma), that usually begins in the left atrium of the heart. Symptoms of atrial myxoma include (but are not limited to) angina, shortness of breath and palpitations.
- + Atrial Pressure
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- Atrial Pressure
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"Atrial Pressure" is more commonly referred to as "Pulmonary Artery Wedge Pressure" in the medical community.
Pulmonary Artery Wedge Pressure
Also Known As: "PAWP, Left Atrial Pressure"
An indirect measurement of pressure in the left atrium, because direct measurement is rather risky. A balloon-tipped catheter is inserted into the pulmonary artery, and the balloon is inflated, wedging itself in. Pressure can then be measured.
- + Atrial Septal Aneurysm
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- Atrial Septal Aneurysm
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Also Known As: "Aneurysm of Septum Secundum, Left Atrial Aneurysm, Right Atrial Aneurysm, Aneurysm of Septum Primum"
Bulging of part of the wall of an atrium. When in the wall between atria, it is called atrial septal aneurysm or aneurysm of septum primum (or secundum). It is often congenital and has been linked to increased stroke risk and patent foramen ovale.
More Information on Atrial Septal Aneurysm: Aneurysm
- + Atrial Septal Defect
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- Atrial Septal Defect
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Also Known As: "ASD, Secundum Atrial Septal Defect, Septal Defect, Primum Atrial Septal Defect"
A heart defect involving a hole in the wall (septum) between the two atria. This causes blood to leak from the left to the right atrium, putting strain on the right side of the heart. May be tolerated well, or may lead to serious consequences.
More Information on Atrial Septal Defect: Pediatric Heart
- + Atrial Septostomy
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- Atrial Septostomy
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"Atrial Septostomy" is more commonly referred to as "Balloon Atrial Septostomy" in the medical community.
Balloon Atrial Septostomy
Also Known As: "Rashkind Procedure, Rashkind Umbrella Device, Rashkind Atrial Septostomy"
Used to treat babies with one or more heart defects. If the baby's oxygen supply is low, and there is a hole in the wall between the left and right atria, then a balloon can be inserted into the hole and inflated to widen it, improving oxygen supply.
More Information on Balloon Atrial Septostomy: Pediatric Heart
- + Atrial Septum
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- Atrial Septum
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"Atrial Septum" is more commonly referred to as "Septum" in the medical community.
Septum
Also Known As: "Ventricular Septum"
A muscular wall separating the right and left chambers of the heart. Also refers to a thin wall separating two cavities, such as in the nose.
More Information on Septum: Heart Basics
- + Atrial Switch
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- Atrial Switch
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"Atrial Switch" is more commonly referred to as "Intraatrial Baffle" in the medical community.
Intraatrial Baffle
Also Known As: "Mustard Procedure, Venous Switch, Senning Procedure, Atrial Switch Procedure"
A surgery to relieve symptoms when the aorta and pulmonary artery are in reversed positions, before surgery can be done to correct the problem. A tunnel is created in the upper chambers of the heart (atria) to redirect blood flow.
More Information on Intraatrial Baffle: Pediatric Heart
- + Atrial Switch Procedure
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- Atrial Switch Procedure
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"Atrial Switch Procedure" is more commonly referred to as "Intraatrial Baffle" in the medical community.
Intraatrial Baffle
Also Known As: "Mustard Procedure, Venous Switch, Senning Procedure, Atrial Switch"
A surgery to relieve symptoms when the aorta and pulmonary artery are in reversed positions, before surgery can be done to correct the problem. A tunnel is created in the upper chambers of the heart (atria) to redirect blood flow.
More Information on Intraatrial Baffle: Pediatric Heart
- + Atrial Tachycardia
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- Atrial Tachycardia
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Tachycardias (or abnormally fast heart rhythms) that result from electrical impulses originating in the atrium, one of two upper chambers of the heart
More Information on Atrial Tachycardia: Arrhythmia
- + Atrial-Ventricular Node
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- Atrial-Ventricular Node
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Also Known As: "Atrioventricular Node"
A small mass of tissue located in the upper right chamber of the heart (right atrium). It is part of the heart's conduction system. It passes impulses from the sinus node to the lower chambers of the heart through the bundle of His.
More Information on Atrial-Ventricular Node: Heart Basics
- + Atrioventricular Block
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- Atrioventricular Block
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"Atrioventricular Block" is more commonly referred to as "Heart Block" in the medical community.
Heart Block
Also Known As: "Third Degree Heart Block, First Degree Heart Block, Complete Heart Block, Movitz AV Block, Second Degree Heart Block, AV Block, Complete AV Block"
The delayed or complete lack of electrical communication between the heart's upper chambers and lower chambers. This causes abnormally slow heart rhythms. It may be classified by the extent that electrical activity is disrupted.
More Information on Heart Block: Arrhythmia
- + Atrioventricular Canal
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- Atrioventricular Canal
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A tube that connects the atria (upper chambers) and ventricles (lower chambers) of the heart in a developing embryo.
More Information on Atrioventricular Canal: Heart Basics
- + Atrioventricular Canal Defect
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- Atrioventricular Canal Defect
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Also Known As: "Common Atrioventricular Canal Defect, Atrioventricular Septal Defect, Endocardial Cushion Defect, Complete Atrioventricular Canal Defect, AVSD, AV Canal Defect, Partial Atrioventricular Canal Defect, Ostium Primum Atrial Septal Defect"
A term used to describe a number of heart defects that result in blood flowing freely across the heart and between the chambers. Often, there is also leakage of blood from the lower chambers back to the upper chambers, which is the wrong direction.
More Information on Atrioventricular Canal Defect: Pediatric Heart
- + Atrioventricular Junction
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- Atrioventricular Junction
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The area of the heart's conduction system that includes the AV node, the area just above the AV node and the area just below the AV node (including the bundle of His).
More Information on Atrioventricular Junction: Heart Basics
- + Atrioventricular Node
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- Atrioventricular Node
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Also Known As: "Atrial-Ventricular Node"
A small mass of tissue located in the upper right chamber of the heart (right atrium). It is part of the heart's conduction system. It passes impulses from the sinus node to the lower chambers of the heart through the bundle of His.
More Information on Atrioventricular Node: Heart Basics
- + Atrioventricular Septal Defect
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- Atrioventricular Septal Defect
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Also Known As: "Common Atrioventricular Canal Defect, Endocardial Cushion Defect, Complete Atrioventricular Canal Defect, AVSD, AV Canal Defect, Partial Atrioventricular Canal Defect, Ostium Primum Atrial Septal Defect, Atrioventricular Canal Defect"
A term used to describe a number of heart defects that result in blood flowing freely across the heart and between the chambers. Often, there is also leakage of blood from the lower chambers back to the upper chambers, which is the wrong direction.
More Information on Atrioventricular Septal Defect: Pediatric Heart
- + Atrium
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- Atrium
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Also Known As: "Left Atrium, Atria, Right Atrium"
One of two upper chambers of the heart. Oxygen-poor blood travels from the right atrium to the right ventricle and out to the lungs. Oxygen-rich blood travels from the left atrium to the left ventricle and out to the body.
More Information on Atrium: Heart Basics
- + Atrophic Gastritis
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- Atrophic Gastritis
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Chronic irritation of the stomach lining, causing the breakdown of mucous membranes and glands in the stomach.
More Information on Atrophic Gastritis: Gastritis & Ulcer
- + Atrophic Vaginitis
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- Atrophic Vaginitis
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A condition caused by thin vaginal skin due to decreased estrogen production in the body.
More Information on Atrophic Vaginitis: Vaginal & Cervical Health
- + Atrophy
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- Atrophy
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Shrinkage or wasting away of tissues, organs or cells due to decreasing size or number of its cells. It may be due to disease, disuse, nerve damage or nutritional deficiency.
More Information on Atrophy: Neuro Signs & Symptoms
- + Atrophy of the Left Ventricle
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- Atrophy of the Left Ventricle
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"Atrophy of the Left Ventricle" is more commonly referred to as "Cardiac Atrophy" in the medical community.
Cardiac Atrophy
Also Known As: "LVA, Heart Atrophy, Left Ventricular Atrophy"
A decrease in size of the heart. It can be brought on by prolonged immobilization or overall "wasting" that can occur with debilitating, chronic illnesses (e.g., anorexia). Left ventricle atrophy affects the lower left chamber of the heart.
More Information on Cardiac Atrophy: Heart Failure
- + ATRT
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- ATRT
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Also Known As: "Atypical Rhabdoid Tumors, Atypical Teratoid Tumors, ATTRHT"
A rare, but aggressive cancer usually found in children under the age of 2. It generally begins in the cerebellum, but commonly spreads through the central nervous system. It is a type of medulloblastoma.
More Information on ATRT: Pediatric Cancer
- + Attachment Q Set
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- Attachment Q Set
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Also Known As: "AQS"
A tool for assessing attachment and security between a parent and child. Descriptors of attachment-related reactions, such as greeting and smiling, are into categories according to the degree that the reactions are apparent in the child.
More Information on Attachment Q Set: Emotional Health Basics
- + Attention Deficit Disorder
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- Attention Deficit Disorder
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Also Known As: "ADD, ADHD, Attention Deficit Hyperactive Disorder"
A neurological disorder characterized by inattentiveness, inability to concentrate, impulsiveness and hyperactivity often accompanied by restlessness, disorganization and mood swings.
More Information on Attention Deficit Disorder: Attention & Learning Disorders
- + Attention Deficit Hyperactive Disorder
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- Attention Deficit Hyperactive Disorder
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Also Known As: "ADD, ADHD, Attention Deficit Disorder"
A neurological disorder characterized by inattentiveness, inability to concentrate, impulsiveness and hyperactivity often accompanied by restlessness, disorganization and mood swings.
More Information on Attention Deficit Hyperactive Disorder: Attention & Learning Disorders
- + Attention Deficit Hyperactivity Disorder
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- Attention Deficit Hyperactivity Disorder
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Also Known As: "Attention Deficit Disorder, ADD, ADHD, Attention Deficit Hyperactive Disorder"
A neurological disorder characterized by inattentiveness, inability to concentrate, impulsiveness and hyperactivity often accompanied by restlessness, disorganization and mood swings.
More Information on Attention Deficit Hyperactivity Disorder: Attention & Learning Disorders
- + ATTRHT
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- ATTRHT
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Also Known As: "ATRT, Atypical Rhabdoid Tumors, Atypical Teratoid Tumors"
A rare, but aggressive cancer usually found in children under the age of 2. It generally begins in the cerebellum, but commonly spreads through the central nervous system. It is a type of medulloblastoma.
More Information on ATTRHT: Pediatric Cancer
- + Attrition
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- Attrition
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Also Known As: "Dental Attrition, Tooth Attrition"
Irreversible wearing of teeth caused by tooth-to-tooth contact (e.g., when chewing or grinding teeth).
More Information on Attrition: Tooth Decay & Damage
- + Atypical Antipsychotics
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- Atypical Antipsychotics
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"Atypical Antipsychotics" is more commonly referred to as "Antipsychotics" in the medical community.
Antipsychotics
Also Known As: "Conventional Antipsychotics, Antipsychotic Drugs, Neuroleptic Medications, Neuroleptics, Antipsychotic Medications, Typical Antipsychotics, Antipsychotic Medicine"
Medications primarily used to treat psychoses, such as schizophrenia, mania and delusional disorder. They may control such symptoms as delusions and hallucinations and may have some mood-stabilizing effects.
More Information on Antipsychotics: Schizophrenia & Psychosis
- + Atypical Autism
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- Atypical Autism
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"Atypical Autism" is more commonly referred to as "Pervasive Developmental Disorder Not Otherwise Specified" in the medical community.
Pervasive Developmental Disorder Not Otherwise Specified
Also Known As: "PDD NOS"
A type of pervasive developmental disorder that includes symptoms of autism (including significant behavior impairment), although not enough for a diagnosis of autism.
More Information on Pervasive Developmental Disorder Not Otherwise Specified: Autism & Related Disorders
- + Atypical Depression
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- Atypical Depression
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Depression associated with increased appetite, oversleeping, lethargy, sensitivity to rejection and positive emotional reactions to the environment and events.
More Information on Atypical Depression: Depression & Bipolar
- + Atypical Facial Pain
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- Atypical Facial Pain
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"Atypical Facial Pain" is more commonly referred to as "Cranial Neuralgias" in the medical community.
Cranial Neuralgias
Also Known As: "Facial Neuralgias"
Pain along a nerve in the head that may be perceived as a headache or facial pain. It can be fast and severe and varies depending on the nerve affected (e.g., trigeminal, glossopharyngeal, occipital).
More Information on Cranial Neuralgias: Ear, Eye & Face Pain
- + Atypical Moles
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- Atypical Moles
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Also Known As: "Atypical Nevi, Dysplastic Moles, Clarks Nevi, Dysplastic Nevi, Atypical Nevus"
Moles that are larger than common moles, with borders that are irregular and poorly defined and that may vary in color. Can be precancerous and should be examined by a physician.
More Information on Atypical Moles: Skin Growths
- + Atypical Nevi
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- Atypical Nevi
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Also Known As: "Dysplastic Moles, Clarks Nevi, Dysplastic Nevi, Atypical Nevus"
Moles that are larger than common moles, with borders that are irregular and poorly defined and that may vary in color. Can be precancerous and should be examined by a physician.
More Information on Atypical Nevi: Skin Growths
- + Atypical Nevus
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- Atypical Nevus
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Also Known As: "Dysplastic Moles, Clarks Nevi, Dysplastic Nevi, Atypical Nevi"
Moles that are larger than common moles, with borders that are irregular and poorly defined and that may vary in color. Can be precancerous and should be examined by a physician.
More Information on Atypical Nevus: Skin Growths
- + Atypical Pneumonia
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- Atypical Pneumonia
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Pneumonia caused by either the Legionella pneumophila, Mycoplasma pneumoniae or Chlamydophila pneumoniae bacteria. It is typically associated with milder pneumonia, but can also be quite severe.
More Information on Atypical Pneumonia: Pneumonia & Lung Infection
- + Atypical Rhabdoid Tumors
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- Atypical Rhabdoid Tumors
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Also Known As: "Atypical Teratoid Tumors, ATTRHT, ATRT"
A rare, but aggressive cancer usually found in children under the age of 2. It generally begins in the cerebellum, but commonly spreads through the central nervous system. It is a type of medulloblastoma.
More Information on Atypical Rhabdoid Tumors: Pediatric Cancer
- + Atypical Teratoid Rhabdoid Tumors
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- Atypical Teratoid Rhabdoid Tumors
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Also Known As: "ATTRHT, ATRT, Atypical Rhabdoid Tumors, Atypical Teratoid Tumors"
A rare, but aggressive cancer usually found in children under the age of 2. It generally begins in the cerebellum, but commonly spreads through the central nervous system. It is a type of medulloblastoma.
More Information on Atypical Teratoid Rhabdoid Tumors: Pediatric Cancer
- + Atypical Teratoid Tumors
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- Atypical Teratoid Tumors
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Also Known As: "ATTRHT, ATRT, Atypical Rhabdoid Tumors"
A rare, but aggressive cancer usually found in children under the age of 2. It generally begins in the cerebellum, but commonly spreads through the central nervous system. It is a type of medulloblastoma.
More Information on Atypical Teratoid Tumors: Pediatric Cancer
- + Audiologist
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- Audiologist
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A professional who specializes in diagnosis and treatment of hearing disorders (e.g., hearing loss, balance problems, fitting hearing aids). While not medical doctors, they hold a Master's Degree and are often associated with an ENT physician.
More Information on Audiologist: Ear Conditions
- + Auditory Processing Disorder
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- Auditory Processing Disorder
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"Auditory Processing Disorder" is more commonly referred to as "Central Auditory Processing Disorder" in the medical community.
Central Auditory Processing Disorder
Also Known As: "CAPD"
An inability to recognize and process sounds in a patient with normal hearing. May randomly occur and come and go from day to day.
More Information on Central Auditory Processing Disorder: Pediatric Hearing & Vision
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- + Augmentation Mammoplasty
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- Augmentation Mammoplasty
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"Augmentation Mammoplasty" is more commonly referred to as "Breast Augmentation" in the medical community.
Breast Augmentation
Procedures to increase (augment) breast size. These are different from reconstructive surgeries performed after full or partial mastectomies.
More Information on Breast Augmentation: Breast Health
- + Aura
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- Aura
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Also Known As: "Fortification Spectra"
Sensations that precede some nervous system disorders (e.g., migraines, seizures). Prior to migraines, a patient may see flashing lights, zigzag lines or have temporary vision loss. Prior to seizures, an odd taste, smell, sound or feeling may occur.
More Information on Aura: Headache & Migraine
- + Auscultation
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- Auscultation
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The process of listening for sounds within the body. When diagnosing heart and blood vessel disorders, this often means listening to heart sounds through a stethoscope.
More Information on Auscultation: Heart Basics
- + Autism
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- Autism
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Also Known As: "Autistic Disorder"
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