Definition

Sickle cell anemia is a blood disorder that changes the shape of some red blood cells (RBCs). The new, sickle shape makes it difficult for RBCs to carry oxygen. The odd shape can also cause acute episodes of pain known as sickle cell crisis.

The body will also destroy these sickle red blood cells because they are abnormal. Destroying sickle cells decreases the overall number of RBCs and can lead to anemia.

The change in the ability and number of RBCs can both decrease the amount of oxygen for the body.

Red Blood Cells: Normal and Sickle Copyright © Nucleus Medical Media, Inc.

Causes    TOP

Sickle cell disease is a genetic disorder. If you receive 1 defective gene from each of your parents, then you will have sickle cell disease.

If you only have 1 defective gene, you are said to have sickle cell trait, but not sickle cell disease. Although you won’t usually have any symptoms, you can pass this gene on to your children.

Risk Factors    TOP

Sickle cell disease is more common in people who are black or of sub-Saharan origin. It is also more common in people of Greek and Italian descent as well as in people from some parts of India, Central and South America, and the Arabian Peninsula.

Symptoms    TOP

This condition produces a group of symptoms known as a sickle cell crisis. These are episodes of pain that occur with varying frequency and severity. It is usually followed by periods of remission. The risk for a sickle cell crisis increases with any activity that boosts the body's requirement for oxygen such as: This may include

• Illness
• Physical or emotional stress
• High altitudes

Sickle cell crises can last hours or days. They affect the bones of the back, the long bones, and the chest. Crises can be severe enough to require hospital admission for pain control and IV fluids.

Symptoms of sickle cell crisis include:

• Pain and swelling in the hands and feet
• Fever
• Yellowed skin known as jaundice
• Pale skin color
• Chest pain, or episodic pain in joints, abdomen, or back
• Shortness of breath
• Fatigue
• Abdominal swelling
• Unusual or prolonged headache
• Any sudden weakness or loss of sensation
• Prolonged erection
• Sudden vision changes
• Sudden, severe anemia can cause:
  • Weakness
  • Shortness of breath
  • Loss of consciousness

Complications of sickle cell anemia include:

• Destruction of the spleen
• Severe bacterial infections:
  • Pneumonia
  • Meningitis
  • Kidney and bone infections
• Damage to the joints, especially hip and shoulder
• Gallstones
• Damage to eyes, resulting in impaired vision
• Stroke or other neurological impairment
• Seizures
• Liver disease
• High rate of hepatitis C
• Damage to penis, due to prolonged erection, which may result in impotence
• Leg ulcers
• Heart murmurs or enlarged heart
• Delayed growth
• Delayed sexual development
• Problems with thinking, memory, and performance
• Aplastic crisis or transient red cell aplasia

Diagnosis    TOP

Sickle cell anemia is diagnosed with a specific blood test. Hemoglobin electrophoresis is a simple blood test. It can be done by most laboratories or a local sickle cell foundation. Most states require testing of newborns for sickle cell.

Amniocentesis is a form of prenatal testing. It can also detect sickle cell disease.

Treatment    TOP

Sickle cell cannot be cured. Basic treatment of sickle cell crisis includes:

• Bed rest
• Pain relief medications
• Oral and IV fluids
• Oxygen—to reduce pain and prevent complications

In addition, treatment may include:

Prevention    TOP

Sickle cell anemia cannot be prevented. There are some general guidelines that may keep the condition under control. Be sure to discuss these with your doctor:

• Take daily folic acid supplements. This will help to build new RBCs.
• Drink plenty of water to prevent dehydration.
• Avoid temperature extremes.
• Avoid overexertion and stress.
• Get plenty of rest.
• Get regular check-ups with knowledgeable healthcare providers.
• Seek genetic counseling.