Marfan Syndrome

Marfan syndrome is an inherited disorder that affects the body's connective tissue, the network of fibers that supports and holds together organs, blood vessels, bones, and other structures throughout the body. Because connective tissue is present nearly everywhere in the body, Marfan syndrome can affect many different organ systems, but it is most clinically significant for its effects on the heart, blood vessels, eyes, and skeleton. The condition is present from birth, though it is frequently not diagnosed until adolescence or adulthood, since its features can be subtle in early childhood and become more apparent as a person grows.

The severity of Marfan syndrome varies widely, even among members of the same family who carry the identical genetic change, ranging from relatively mild involvement of a single organ system to severe, multi-system disease. The most serious concern in Marfan syndrome is its effect on the aorta, the large blood vessel that carries blood from the heart to the rest of the body, since weakened connective tissue can cause the aorta to gradually widen and, without monitoring and treatment, become vulnerable to a life-threatening tear or rupture.

People with Marfan syndrome often, though not always, share a recognizable physical build and set of features:

• Skeletal features — tall and slender build, with unusually long arms, legs, fingers, and toes; a chest that appears sunken or protruding compared with a typical chest wall; a curved spine; flat feet; and joints that are more flexible than usual
• Eye involvement — common and includes a dislocated or displaced lens within the eye, as well as an increased risk of nearsightedness, cataracts at a younger age than usual, and retinal detachment
• Cardiovascular signs — the most important, though these are often not felt directly by the patient until a problem becomes advanced. Gradual widening of the aorta typically causes no symptoms at all until it becomes severe, at which point sudden, severe chest or back pain can signal a dangerous tear in the aortic wall, a medical emergency requiring immediate care. Heart valve problems, particularly involving the mitral valve, can cause a heart murmur, palpitations, or, in some cases, symptoms of heart failure

Marfan syndrome is caused by a change, or mutation, in a gene called FBN1, which provides instructions for making a protein called fibrillin-1 that is a key structural component of connective tissue throughout the body. When this gene is altered, the connective tissue that is produced is weaker and less elastic than normal. This explains why the condition can affect so many different parts of the body simultaneously, since fibrillin-1 is present in nearly every organ system. In most cases, Marfan syndrome is inherited from a parent who also has the condition, following a pattern in which each child of an affected parent has roughly a fifty percent chance of inheriting the same gene change. In a smaller proportion of cases, the gene change arises spontaneously in a person with no family history of the condition, meaning it was not inherited from either parent but instead occurred as a new genetic change.

Having a parent with Marfan syndrome is by far the most significant risk factor, given the condition's inheritance pattern, and is the primary reason genetic counseling and testing are recommended for children of an affected parent.

Because Marfan syndrome is a genetic condition present from conception, there are no meaningful behavioral or environmental risk factors that increase the likelihood of developing it; rather, family history is essentially the entire risk profile. This makes early recognition within an affected family especially valuable, since a known family diagnosis allows other relatives to be evaluated and monitored proactively rather than only after symptoms or a complication develop.

Marfan syndrome itself cannot be prevented, since it is caused by an inherited or, less commonly, a spontaneous genetic change present from birth. What can be meaningfully prevented, however, is the most dangerous complication of the condition: a life-threatening aortic tear or rupture.

• Undergo regular monitoring of the aorta's size through periodic echocardiograms, allowing gradual widening to be tracked closely so that preventive treatment can begin well before the aorta reaches a dangerous size
  
  
• Take medications that lower blood pressure and reduce the force of blood flow against the aortic wall, which can meaningfully slow the rate at which the aorta widens over time
  
  
• Avoid activities that involve intense straining or a high risk of chest trauma, particularly certain contact sports and heavy weightlifting, to reduce additional stress on an already vulnerable aorta
  
  
• For those planning a pregnancy, which places additional strain on the cardiovascular system, seek careful pre-conception cardiovascular evaluation and close monitoring throughout pregnancy given the increased risk of aortic complications during this time