Marfan Syndrome (aortic dilation, aortic aneruysm/dissection, tall, long-limbs, and lens disloculation)

🫀 Marfan Syndrome – Overview for NP Students

🧬 What Is It?

Marfan syndrome is a genetic connective tissue disorder that affects the skeletal, cardiovascular, ocular, and other systems. It is autosomal dominant and caused by mutations in the FBN1 gene on chromosome 15, which codes for fibrillin-1, a key component of elastic fibers.

📊 Epidemiology

  • Occurs in ~1 in 5,000 people

  • 75% inherited, 25% de novo mutations

  • Affects males and females equally

⚠ Why It Matters

Life-threatening risk: Aortic root dilation/dissection
Without surveillance and treatment, patients are at risk for sudden cardiac death, especially in young adulthood.

🧠 Key Clinical Features (Multisystem Involvement)

System

Findings

Skeletal

Tall stature, long limbs (dolichostenomelia), arm span > height, arachnodactyly (long fingers), pectus excavatum/carinatum, scoliosis, joint hypermobility

Cardiovascular

Aortic root dilation, aortic aneurysm/dissection, mitral valve prolapse

Ocular

Ectopia lentis (lens dislocation), myopia

Skin

Stretch marks (striae) not related to weight change

Pulmonary

Risk of spontaneous pneumothorax

🩺 Diagnosis: Ghent Criteria (Revised)

Diagnosis is based on:

  • Aortic root enlargement (Z-score ≥2)

  • Ectopia lentis

  • FBN1 pathogenic mutation

  • Systemic score (based on physical findings)

🧮 Systemic Score (≥7 points supports diagnosis):

  • Wrist/thumb sign (+3)

  • Pectus deformity (+1 or +2)

  • Scoliosis/kyphosis (+1)

  • Hindfoot deformity (+2)

  • Skin striae (+1)

  • Myopia >3 diopters (+1)

  • Mitral valve prolapse (+1)

🧬 Genetic testing can confirm FBN1 mutation, especially in uncertain cases.

🩺 NP Role in Primary Care

🚩 Early Recognition

Look for:

  • Tall, thin patient with long limbs

  • Family history of sudden cardiac death or aortic dissection

  • Complaints of visual changes or palpitations

  • Physical features (scoliosis, pectus deformity, joint hypermobility)

📅 Routine Surveillance

  • Annual echocardiogram: Monitor aortic size

  • Ophthalmology: Yearly exams for lens dislocation and vision problems

  • Orthopedics: Scoliosis and chest deformity management

  • Genetic counseling: For patient and at-risk family members

⚠ Avoid:

  • Contact sports and high-intensity exercise (risk of aortic rupture)

  • Fluoroquinolones and stimulants (some caution with connective tissue disorders)

💊 Treatment & Management

Goal

Approach

Slow aortic dilation

Beta-blockers (1st line), ARBs (like losartan)

Prevent dissection

Timely surgery if aortic root >5.0 cm or grows rapidly

Manage MVP or arrhythmias

Cardiology evaluation

Address scoliosis

Physical therapy, bracing, surgery if severe

🧑‍⚕ Patient & Family Education

  • Genetic basis: 50% chance of passing it on

  • Avoid high-risk activities (e.g., heavy lifting, intense sports)

  • Importance of lifelong follow-up and regular cardiac imaging

  • Notify healthcare providers before surgery or dental procedures (concern for valve issues)

✅ Quick Clinical Clues

  • Arm span > height

  • Arachnodactyly (positive wrist and thumb sign)

  • Tall, thin teen with pectus excavatum + murmur? Think Marfan.

  • Family history of sudden death? Always ask and investigate!