What is the definition or description of: stenosis?

Stenosis. Constriction or narrowing of something - duct, artery, passage way such as the outlet of the stomach into the small intestine (called pyloric stenosis).

Related Questions

What is the definition or description of: Spinal stenosis?

Reduced spinal canal. Reduction in the spinal canal whether in the cervical, thoracic or lumbar. Usually causing neurogenic claudicatory symptoms like pain going down the legs or arms. If these are going on, you definitely need to see a specialist.

What is the definition or description of: pyloric stenosis?

See below. Pyloric stenosis is a narrowing of the pylorus, the opening from the stomach into the small intestine. The cause of the thickening is unknown, although genetic factors may play a role. Children of parents who had pyloric stenosis are more likely to have this condition.
Stomach blockage. Pyloric stenosis is when the pyloric muscle thickens and closes off the outlet to the stomach. This causes vomiting which lead to dehydration. Happens usually between 2-8 weeks of age. Vomiting can be forceful.
Stomach obstruction. Pyloric stenosis is thickening or hypertrophy of pyloric muscle causing gastric outlet obstruction. Usually 3 to 6 weeks of age, more common in males. Projectile vomiting. Forceful ejection of milk or formula up to several feet away, persistent hunger, increased stomach contractions, dehydration. Changes in bowel movements, maintaining or loosing weight. Cure is usually incision into pyloric muscle.

What is the definition or description of: Aortic stenosis?

Aortic Stenosis. Aortic stenosis is the abnormal narrowing of the aortic valve. As the aortic valve develops progressive narrowing, the heart must work harder to contract and "squeeze" the blood through a smaller and smaller outflow orifice. This will eventually cause symptoms such as chest pain, dyspnea, or loss of consciousness. Severe aortic stenosis requires valve replacement.

What is the definition or description of: Valvular pulmonic stenosis?

Pulmonic Stenosis. Valvular pulmonic stenosis is the condition of an abnormal narrowing of the pulmonic valve. The pulmonic valve is between the right ventricle and the pulmonary artery and prevents reverse flow back into the right ventricle. Of the valve conditions, PS is rare, but when present can result in problems of the right ventricle which has to work harder to overcome the narrowed orifice of the PS.

What is the definition or description of: renal artery stenosis?

Stenosis. Stenosis is narrowing so renal artery stenosis is narrowing of an artery that sends blood to you kidney. The effect usually is your blood pressure goes up and in my experience this is the most difficult kind of high blood pressure to manage using medicines. It usually requires some kind of repair - surgery or dilatation.
Narrow kidney artery. Narrowing the artery to a kidney reduces blood flow to that kidney. As a result high blood pressure can develop. It can be treated by passing a balloon catheter into that artery and expanding the balloon. However, this does not always cure the high blood pressure. The reason could be that the kidney has already been damaged and it is too late to fix it with improved blood supply.
RAS. Renal artery stenosis is a blockage in the artery leading to the kidney. The blockages are treated only when they are significant clinically. Usually the blockage needs to be greater than 70% and accompanied by clinical symptoms (poorly controlled htn, flash pulmonary edema, worsening renal function). The stenosis are most commonly caused by atherosclerosis and fibromuscular dysplasia.

What is the definition or description of: lumbar spine stenosis?

Lumbar stenosis. This is an abnormal narrowing of the lumbar spine that can lead to numerous nerve problems below the narrowed area.
Lumbar stenosis. Overgrowth of arthritis from joints, discs, ligaments, etc that causes pressure on nerves. Classically it is referred to as neurogenic claudication with pain in back and legs, worse with extension, better with flexion, distance limits on walking etc etc, should be differentiated from vascular problems in legs. Surgery can be min invasive or open with or without instrumentation.
Tight canal. The spinal cord is surrounded by a tube of bone made up the stacked vertebrae and called the spinal canal. If the canal is restricted and smaller due to injury, fracture, herniated disc, arthritic spurs, or simply being born that way then you have spinal stenosis. The stenosis threatens to pinch on the cord or nerves'.