What cardiac abnormalities are associated with Marfan syndrome?

Cardiac Abnormalities in Marfan Syndrome

The primary cardiac abnormalities in Marfan syndrome are aortic root dilatation (present in ~81% of patients), mitral valve prolapse, aortic valve regurgitation, and increasingly recognized intrinsic myocardial dysfunction with ventricular arrhythmias 1, 2.

Major Cardiovascular Manifestations

Aortic Pathology (Most Critical)

• Aortic root dilatation is the hallmark and most life-threatening feature, occurring in approximately 81% of patients 1
• Develops in early childhood and is present equally in both pediatric and adult populations 1
• Risk of dissection increases with diameter; surgical thresholds are typically >40 mm in adults (or z-score >2) 3
• Can occur anywhere along the aorta, though thoracic involvement predominates 4

Valvular Abnormalities

• Mitral valve prolapse: Common in both children and adults, with similar prevalence across age groups 1

  • May be an early indicator of serious pediatric disease 5
  • Can progress to mitral regurgitation, more commonly seen in adults 1
  • Mitral annular disjunction detectable on cardiac MRI 5

• Aortic valve regurgitation: Present in both pediatric and adult populations with similar frequency 1

• Tricuspid valve prolapse: Associated with increased risk of early cardiac surgery 6

  • More prevalent in surgical patients 6

Myocardial Disease (Emerging Recognition)

Recent evidence reveals intrinsic cardiac dysfunction independent of valvular disease 2, 5:

• Mild myocardial involvement even in patients without previous surgery or significant valvular dysfunction 2
• Larger left ventricular end-diastolic diameter (LVEDD) 2
• Decreased right ventricular function (lower TAPSE) 2
• Seven percent of patients may develop reduced LV ejection fraction 2
• Ventricular arrhythmias: Non-sustained ventricular tachycardia (NSVT) occurs in approximately 23% of patients 2
  • Higher risk with larger LVEDD and increased ventricular extrasystoles 2
  • Myocardial fibrosis detectable on cardiac MRI 5

Pulmonary Artery Involvement

• Pulmonary artery dilatation occurs and is more prevalent in surgical patients 6
• Found mostly in adults rather than children 1

Risk Stratification Features

Patients requiring early cardiac surgery demonstrate specific phenotypic associations 6:

• Marfan-type facial features (OR 3.0-4.6)
• Pectus carinatum (OR 3.0-4.6)
• Pes planus (OR 3.0-4.6)
• Hindfoot deformity (OR 3.0-4.6)
• Myopia ≥3 diopters (OR 3.0-4.6)
• Higher systemic manifestation scores per revised Ghent criteria (9.2 vs 5.2) 6

Surveillance Requirements

Per American Heart Association/American College of Cardiology guidelines 3:

• Echocardiographic surveillance every 6-12 months for all Marfan patients (Class I, Level C) 3

  • Frequency depends on aortic size and stability
  • MRA or CT may be needed in addition to echocardiography 3

• Ambulatory ECG monitoring should be considered, especially in patients with valvular disease, previous cardiac surgery, larger LVEDD, or frequent ventricular extrasystoles 2

• Cardiac MRI is essential for detecting mitral annular disjunction and myocardial fibrosis 5

Clinical Pitfalls

Critical caveat: Cardiovascular abnormalities develop in early childhood 1. The similar prevalence of aortic root dilatation, mitral valve prolapse, and aortic regurgitation between children and adults indicates these are not progressive age-related phenomena but early-onset manifestations requiring vigilant surveillance from diagnosis.

Patients with previous surgery or significant valvular dysfunction are more severely affected with myocardial disease and arrhythmias 2, necessitating more intensive monitoring including ambulatory ECG and consideration of cardiac MRI.