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Fibromuscular Dysplasia

The Joe Niekro Foundation - Midwest Chapter has partnered with The Mayo Clinic-Rochester to help fund further research of Vascular Diseases/FMD and Brain Aneurysms.  Mayo Clinic has several case studies for FMD and aneuryms, both in progress and planned for the future and it is our mission to continue this advancement and continue to educate the community of these fatal conditions.  

WHAT IS FIBROMUSCULAR DYSPLASIA?

Fibromuscular dysplasia (FMD) is a non-atherosclerotic, non-inflammatory vascular disease in which at least one of your arteries has an abnormal cluster of cells growing in the artery wall. This cluster causes the artery to narrow (stenosis), such as arteries in the kidneys (renal artery), arteries to the brain (carotid artery/vertebral artery) and less commonly the arteries that supplies the abdomen (abdominal aorta), which can cause damage to the organs that, receive blood through the narrowed artery. FMD is so poorly understood by many healthcare providers, treatment is often not optimal, leading to impaired quality of life and potential serious number of complications, such as hypertension, stroke, myocardial infarction (heart attack), aneurysms (arterial swelling) and arterial dissection, if left untreated. This can cause symptoms if the blood flow is decreased enough.  In some patients, the diagnosis of FMD can lead to invasive procedures such as percutaneous angioplasty, reconstructive surgery or intracranial aneurysm clipping. Thus, both the disease and its treatment can lead to significant morbidity. However, FMD is often diagnosed incidentally in the absence of any signs or symptoms during an imaging study. When the vessel is filled with dye for an X-ray, it will show a characteristic “string of beads” appearance. 
Fibromuscular dysplasia is a seldom seen arterial disease characterized by abnormal cellular development or growth.  Fibromuscular dysplasia commonly occurs in the renal arteries, the ones that supply blood to the kidneys. About 75% of the patients diagnosed contracted the disease on these parts. The second most common organ affected by fibromuscular dysplasia is the brain. Such condition is called carotid fibromuscular dysplasia. It is most often diagnosed in women, a fact that has led researchers to theorize that there is a connection between FMD, as it is known in short, and hormones. A second postulation is that the disease is a genetically based development disorder. These theories—and others—remain exactly that, and the disease’s cause remains unknown at this time. However, there is evidence that chronobiology -based treatments may have a role in managing fibromuscular dysplasia.
 

 

 

WHAT ARE THE SYMPTOMS OF FMD?

Most people who have FMD don't have any symptoms. Still, it's possible you could have some signs or symptoms of the disease, depending on what artery is affected by Fibromuscular Dysplasia.
 
Kidney Signs and Symptoms
If the arteries to your kidneys (renal arteries) are affected, you may have:
  • High blood pressure
  • Tissue damage in your kidney (ischemic renal atrophy)
  • Chronic kidney failure, rarely
Brain Signs and Symptoms
If the arteries to your brain (carotid arteries) are affected, you may have:
  • Dizziness
  • Blurred vision or temporary loss of vision
  • Ringing in your ears (tinnitus)
  • Neck pain
  • Chronic headaches
  • Facial weakness or numbness
Abdominal Signs and Symptoms
If the arteries to your abdomen (mesenteric arteries) are affected, you may have:
  • Abdominal pain after eating
  • Unintended weight loss
Arm and Leg Signs and Symptoms
If the arteries to your arms or legs (peripheral arteries) are affected, you may have:
  • Discomfort when moving your arms, legs, hands or feet
  • Cold limbs
  • Weakness
  • Numbness
  • Skin changes in color or appearance
Some people with fibromuscular dysplasia have more than one narrowed artery. If you have any of the signs or symptoms listed and are concerned about your risk of FMD, see your doctor. Because fibromuscular dysplasia tends to be hereditary, tell your doctor about your family history of the disease, even before you show any symptoms so that he or she can be alert to changes that might suggest you have fibromuscular dysplasia. There's currently no genetic test for fibromuscular dysplasia. And, screening for fibromuscular dysplasia isn't possible either, since it can occur in any of your arteries.

 

WHAT CAUSES FMD? 

While the cause of fibromuscular dysplasia is unknown, it's believed that several factors may play a role.
  • Genetics - Genetics may play a role in the development of fibromuscular dysplasia. But, if another family member has fibromuscular dysplasia, you or a relative may never get fibromuscular dysplasia, or you might get the condition in a different artery or have a milder case or a more severe case than your family member's fibromuscular dysplasia. In addition, not everyone who has fibromuscular dysplasia has a relative with the disease.
  • Hormones - Because premenopausal women have fibromuscular dysplasia more often than men do, hormones may be linked to the development of fibromuscular dysplasia. However, fibromuscular dysplasia is not linked to how many pregnancies a woman has had, when she gives birth or whether she's taken birth control pills.
  • Abnormally formed arteries - Fibromuscular dysplasia could be caused by inadequate oxygen to the arteries that supply your blood vessel walls with blood, which causes the vessels to form abnormally. It could also be caused if the position of your arteries in your body is abnormal, or if a medication or tobacco causes your arteries to develop abnormally. Once the artery develops abnormally, a cluster of cells builds in the artery wall, narrowing it and reducing blood flow. 

WHAT ARE THE RISK FACTORS OF FMD? 

Although the cause of FMD is unknown, there are several factors that appear to increase the risk of developing the disorder, including:
  • Sex - Women have a much greater risk of fibromuscular dysplasia than do men.
  • Age - Fibromuscular disorder tends to be more common in people from 25 to 50 years old.
  • Smoking People who smoke appear to have an increased risk of developing fibromuscular dysplasia. For those already diagnosed with the disease, smoking is a risk factor for more serious fibromuscular dysplasia. 

WHAT ARE THE COMPLICATIONS OF FMD?  

Fibromuscular dysplasia can cause a number of complications. These include:
  • High blood pressure - A common complication of fibromuscular dysplasia is high blood pressure. The narrowing of the arteries causes higher pressure on your artery walls, which can lead to further artery damage or heart failure.
  • Chronic kidney failure - If the artery to the kidney is narrowed by fibromuscular dysplasia, you may not get enough blood flow to your kidney, causing permanent kidney injury.
  • Dissected artery - Fibromuscular dysplasia can cause tears in the walls of your arteries, causing blood to leak into the artery wall.
  • Aneurysms - When your arteries are narrowed, the blood flow can weaken the wall of your arteries, creating a bulge called an aneurysm. If an aneurysm ruptures, it can be a life-threatening emergency. An aneurysm can occur in any artery affected by fibromuscular dysplasia.
  • Stroke - If you have a dissected artery leading to your brain or if an aneurysm in an artery to your brain ruptures, you can have a stroke

HOW IS FMD DIAGNOSED? 

Unlike more common diseases such as diabetes or cancer, FMD is not clearly symptomatic. Diagnosis is often stumbled into after arterial condition has deteriorated so as to manifest a vascular event such as high blood pressure, kidney failure, or stroke.
The tests you'll have to diagnose fibromuscular dysplasia could include:
  • Doppler Ultrasound - Doppler ultrasound can determine if an artery is narrowed by fibromuscular dysplasia. In this noninvasive test, an instrument called a transducer is pressed to your skin to send sound waves into your body. The sound waves bounce off red blood cells, and the ultrasound can estimate how fast your blood flows. If your blood is moving slowly through an artery, it may be due to fibromuscular dysplasia.
  • Computerized Tomography (CT) Angiogram - A CT angiogram allows your doctor to check your arteries to see if they're narrowed or blocked. You'll receive an injection of a radioactive dye, and the doughnut-shaped CT scanner will be moved to take images of the artery your doctor believes is narrowed.
  • Magnetic Resonance Imaging (MRI) - This test allows your doctor to see the soft tissues in your body. During an MRI, you lie on a table inside a long tube-like machine that uses a magnetic field and radio waves to capture images from inside your body. Using the images from the test, your doctor may be able to see the cluster of cells narrowing your artery.
  • Digital Subtraction Angiogram - This test is used to check for fibromuscular dysplasia of the kidney. In this test, you'll first have an X-ray taken of the part of your body where your artery may be narrowed. Then you'll receive an injection of a radioactive dye to darken your arteries. Your doctor will then take another X-ray and digitally remove other tissues and blood vessels from the X-ray image. This allows your doctor to clearly see the artery that may be affected.
The most common form of fibromuscular dysplasia looks like a "string of beads" on imaging tests. Other, more aggressive forms of fibromuscular dysplasia have a smooth appearance.
Once you've been diagnosed with fibromuscular dysplasia, your doctor may repeat a Doppler ultrasound exam or a CT angiogram every six to 12 months to see if your condition is getting worse.
 

 

50% of Patients with Extra-Cranial Cerebrovascular FMD have

an associated Intra-Cranial Aneurysm

 

HOW IS FMD TREATED? 

Treatment for fibromuscular dysplasia depends on your health, the location of the narrowed artery and other underlying conditions you have, such as high blood pressure. Treatment options include medical procedures, surgery and medications.
 
Medical Procedures and Surgery
For otherwise healthy people with fibromuscular dysplasia, repairing the affected artery is often recommended. The procedures to improve blood flow can include:
  • Percutaneous Transluminal Renal Angioplasty (PTRA) - This procedure is often performed at the same time as a digital subtraction or CT angiogram. Once the dye from the angiogram shows the narrowed area of the artery, a wire is threaded to the artery and a catheter with a balloon is inserted in the narrowed area. The balloon is then inflated to open the narrowed part of the artery. Unlike the angioplasty procedures performed on people with heart disease, a stent is usually not necessary to keep the artery open. PTRA is usually performed while you're awake, although you'll be given a sedative to relax during the procedure. The procedure takes about one to two hours.
  • Surgical Revascularization - If PTRA is not an option, and the narrowing of your arteries is severe, your doctor may recommend more invasive surgery to repair the narrowed portion of the artery. The type of surgery you'll need depends on the location of the narrowed artery and how damaged the artery is. These procedures require general anesthesia, meaning you'll be unconscious during the surgery.
If your doctor finds serious damage related to fibromuscular dysplasia, such as an aneurysm, he or she may recommend placing a metal mesh tube (stent) inside the weakened part of the artery to help prevent it from rupturing.
 
Drugs
Treatment with high blood pressure medications is recommended for most people with fibromuscular dysplasia, even if you also have a procedure to correct your condition. These could include medications from several categories:
  • Angiotensin-converting Enzyme (ACE) Inhibitors - such as benazepril (Lotensin), enalapril (Vasotec) or lisinopril (Prinivil, Zestril), stop the narrowing of your blood vessels.
  • Angiotensin II Receptor Blockers - These medications help relax blood vessels by blocking the action of a natural chemical that narrows blood vessels. Examples of this class of medications include candesartan (Atacand), irbesartan (Avapro), losartan (Cozaar) and valsartan (Diovan).
  • Diuretics - These drugs, such as hydrochlorothiazide (Microzide, others), help remove excess from your body and may be used in conjunction with other blood pressure medications.
  • Calcium Channel Blockers - such as amlodipine (Norvasc) or nifedipine (Adalat, Procardia) and others, help relax your blood vessels.
  • Beta Blockers - such as metoprolol (Lopressor, Toprol-XL) or atenolol (Tenormin) and others, slow your heartbeat and block adrenaline.
Because some of these drugs can affect the way your kidneys work, your doctor may recommend blood tests and a urine test (urinalysis) to make sure your kidneys work normally.  If you're a smoker, another part of your treatment plan is to stop smoking. Smoking makes fibromuscular dysplasia worse.
There is no standard protocol to treat FMD. Any treatment to improve blood flow is based on the arteries affected and the progression and severity of the disease. The carotid arteries should be tested if FMD is found elsewhere in the body since carotid involvement is linked to an increased risk of stroke. Patients with minimal narrowing may take a daily antiplatelet such as an aspirin or an anticoagulant to thin the blood and reduce the chances that a clot might form. Medications such as aspirin can also be taken for headache and neck pain, symptoms that can come from FMD. Patients with arterial disease who smoke should be encouraged to quit as smoking worsens the disease. Further treatment may include angioplasty, in which a small balloon is inserted through a catheter and inflated to open the artery. Small tubes called stents may be inserted to keep arteries open. Surgery may be needed to treat aneurysms that have the potential to rupture and cause bleeding within the brain.
The only form of management for FMD is repeated screenings to monitor patients’ arteries and for patients to foster good health practices common to other vascular patients such as not smoking and eating a balanced diet. However, patients and doctors would be well advised to implement precautions based on biological rhythms into routine FMD management.

 

HOW MANY PEOPLE ARE AFFECTED BY FMD?

Although considered a rare disease, it is possible up to 10 million Americans have FMD, although many never experience any symptoms. About 85 percent of known cases have affected women under 50 and girls, although men and boys can have it too.

 

FMD can lead to Kidney Failure, Stroke and Brain Aneurysms

 

Watch a patient testimonial from Vice President of The Joe Niekro Foundation, Kari Ulrich, who suffers with FMD and brain aneurysms.


Click here to make a donation to help further research for FMD and Aneurysms of visit our Causes on Facebook Page 

 


 

*1998-2011 Mayo Foundation for Medical Education and Research (MFMER).


 

 

 
Joe Niekro