Hyperviscosity Syndrome

What is Hyperviscosity Syndrome?

Hyperviscosity syndrome is a condition where your blood becomes too thick to flow easily through your vessels. Think of it like trying to pump honey instead of water through a straw. When blood thickens, it moves more slowly and has trouble delivering oxygen and nutrients to your organs.

This thickening happens when certain substances in your blood reach abnormally high levels. The most common causes include too many red blood cells, white blood cells, or abnormal proteins floating in your bloodstream. These substances make your blood more viscous, which means it has a thicker, stickier consistency than healthy blood.

Hyperviscosity syndrome is not a disease itself but rather a complication of other underlying conditions. It most often occurs in people with blood cancers like leukemia or multiple myeloma, or in blood disorders like polycythemia vera. Getting the right diagnosis and treatment early can prevent serious complications like stroke or vision loss.

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Symptoms

Headaches and dizziness that come and go
Blurred vision or sudden vision changes
Nosebleeds or bleeding gums that happen easily
Confusion or difficulty concentrating
Shortness of breath during normal activities
Fatigue that does not improve with rest
Ringing in the ears, also called tinnitus
Numbness or tingling in your fingers and toes
Chest pain or discomfort

Some people develop symptoms slowly over weeks or months. Others may not notice anything unusual until the condition becomes severe and causes a medical emergency.

Causes and risk factors

Hyperviscosity syndrome develops when something causes your blood to thicken beyond normal levels. The most common cause is high levels of abnormal proteins called immunoglobulins, which are produced by conditions like multiple myeloma or Waldenstrom macroglobulinemia. These proteins make your blood plasma thicker and harder to pump through small vessels. Other causes include too many red blood cells, which happens in polycythemia vera, or extremely high white blood cell counts from leukemia.

Certain risk factors increase your chances of developing this syndrome. Having a blood cancer or bone marrow disorder puts you at highest risk. Dehydration can worsen blood thickness in people who are already at risk. Rarely, very high cholesterol or triglyceride levels can contribute to increased viscosity. Some people have genetic conditions that affect blood cell production and make them more vulnerable to this syndrome.

How it's diagnosed

Doctors diagnose hyperviscosity syndrome through a combination of symptoms and specialized blood tests. A serum viscosity test measures how thick your blood is compared to water. This test requires specialized equipment and is typically ordered when doctors suspect this syndrome based on your symptoms and medical history. Additional blood tests help identify the underlying cause, such as protein levels, red blood cell counts, white blood cell counts, and immunoglobulin levels.

Your doctor may also perform a physical exam to check for signs like enlarged organs or bleeding in the back of your eyes. Eye exams can reveal sausage-shaped veins in your retina, a telltale sign of hyperviscosity. While routine blood panels can show clues like elevated red blood cells or abnormal proteins, specialized viscosity testing is needed for confirmation. Talk to your doctor about appropriate testing if you have symptoms or a blood disorder that puts you at risk.

Treatment options

Plasmapheresis, a procedure that removes excess proteins from your blood plasma
Phlebotomy, or blood removal, to reduce red blood cell counts in polycythemia
Chemotherapy or other medications to treat underlying blood cancers
Hydration therapy to dilute blood and improve flow
Treatment of the underlying condition causing high viscosity
Regular monitoring of blood viscosity and cell counts
Avoiding dehydration by drinking adequate water daily
Managing related conditions like high cholesterol or triglycerides

Frequently asked questions

Many people describe feeling foggy or confused, like they cannot think clearly. You might experience headaches, vision problems, or extreme fatigue that does not go away with rest. Some people notice unusual bleeding like nosebleeds or bruising easily. The symptoms often develop gradually, so you might not realize how unwell you have become until the condition is diagnosed.

Hyperviscosity syndrome is a medical emergency that requires prompt treatment. Without treatment, it can cause stroke, heart attack, or severe bleeding. The thickened blood cannot deliver oxygen properly to vital organs, which can lead to organ damage. With proper treatment, most people recover well and symptoms improve quickly once blood viscosity returns to normal.

The syndrome itself can be treated and reversed by reducing blood viscosity. However, the underlying condition causing it usually requires ongoing management. For example, if blood cancer is causing the problem, you will need cancer treatment. Successfully treating the root cause prevents hyperviscosity from returning.

A serum viscosity test uses a special instrument called a viscometer to measure how thick your blood is. The lab compares your blood sample to water to get a ratio. Normal blood is about 1.4 to 1.8 times thicker than water. Readings above 4.0 typically indicate hyperviscosity syndrome and require urgent treatment.

Plasmapheresis is a procedure that filters your blood to remove excess proteins or cells causing thickness. Your blood is drawn out, passed through a machine that separates plasma from blood cells, and then returned to your body with replacement fluid. This treatment can quickly reduce viscosity and relieve symptoms. Most people need multiple sessions depending on the underlying cause.

Dehydration alone rarely causes hyperviscosity syndrome in healthy people. However, it can worsen blood thickness in people who already have conditions like polycythemia or high protein levels. Staying well hydrated is important for anyone at risk. Drinking enough water helps maintain proper blood flow and prevents complications.

Waldenstrom macroglobulinemia is the most common cause, affecting up to 30% of patients with this condition. Multiple myeloma can also cause it when abnormal proteins build up in the blood. Polycythemia vera, which causes too many red blood cells, is another frequent cause. Certain types of leukemia with very high white blood cell counts can trigger hyperviscosity as well.

Most people notice improvement within hours to days after starting treatment like plasmapheresis or phlebotomy. Vision problems and headaches often resolve quickly once blood flow improves. Fatigue and confusion may take a few days to fully clear. Long-term symptom control depends on managing the underlying condition that caused the hyperviscosity.

While diet alone cannot cure hyperviscosity syndrome, staying hydrated is essential. Drink plenty of water throughout the day to help maintain blood flow. If high cholesterol or triglycerides contribute to your condition, a heart-healthy diet low in saturated fats may help. Talk to your doctor about specific dietary recommendations based on your underlying condition.

Testing frequency depends on your underlying condition and treatment plan. People with blood cancers or disorders may need monthly blood work to monitor cell counts and protein levels. If you have had hyperviscosity syndrome before, your doctor will likely check your viscosity regularly. Follow your healthcare team's recommended testing schedule to catch problems early before symptoms develop.