Valve Dysfunction Diagnosis and Management

Diagnostic Evaluation

• The European Society of Cardiology recommends transthoracic echocardiography (TTE) as the first-line diagnostic tool to confirm the presence, severity, and etiology of valve dysfunction, evaluating valve morphology and function, presence and severity of aortic stenosis or regurgitation, left ventricular size and function, and initial assessment of aortic dimensions 1
• Computed tomography (CT) or magnetic resonance imaging (MRI) angiography is indicated when the morphology of aortic sinuses, sinotubular junction, or ascending aorta cannot be fully assessed by TTE, with parameters including aortic dimensions at multiple levels (aortic annulus, sinuses of Valsalva, sinotubular junction, ascending aorta, and transverse arch) 1
• Valve function parameters, such as valve area, peak/mean gradients, regurgitant fraction/volume, and vena contracta width, are essential for evaluating valve dysfunction, with a vena contracta width >0.6 cm indicating severe aortic regurgitation 1

Invasive Coronary Angiography

• The European Society of Cardiology recommends invasive coronary angiography in patients with symptoms of angina, evidence of ischemia, decreased left ventricular systolic function, history of coronary artery disease, men >40 years of age, post-menopausal women, and patients with ≥1 cardiovascular risk factors 1

Non-Invasive Alternative

• A reasonable alternative to invasive angiography in patients with low to intermediate pre-test probability of coronary artery disease is recommended, as well as when invasive angiography is technically challenging or high-risk 1

Monitoring and Operative Intervention

• The European Society of Cardiology recommends TTE every 1-2 years for moderate valve dysfunction and every 6-12 months for severe asymptomatic valve dysfunction 1
• Operative intervention is indicated when aortic diameter ≥5.5 cm in asymptomatic patients, ≥5.0 cm with risk factors, or ≥4.5 cm in patients undergoing aortic valve replacement for severe stenosis or regurgitation 2, 3
• The American College of Cardiology recommends operative intervention in asymptomatic BAV patients when aortic root/ascending aortic diameter ≥5.5 cm, with a Class I recommendation (Level B-NR) 3
• Additional risk factors for aortic dissection in BAV patients include:
• The incidence of aortic dissection in patients with bicuspid aortic valve (BAV) and dilated aortic root is approximately 3.1 cases per 10,000 patient-years, representing an 8.4-fold increased risk compared to the general population 2
• BAV patients tend to present with aortic dissection at younger ages than those with tricuspid valves 3
• Surgical expertise is crucial, and procedures should be performed by experienced surgeons in centers with established expertise 3
• The recommended surgical approach is aortic root replacement/ascending aorta replacement based on size criteria [American College of Cardiology 3, 4]
• Valve preservation could be considered if anatomically feasible [American College of Cardiology 5]
• Aortic imaging at least annually for patients with significant dilation (>4.5 cm) is recommended [American College of Cardiology 2]
• More frequent imaging (every 4-12 weeks) during pregnancy is recommended [European Heart Journal 6]
• Consider longer intervals between imaging for patients with milder dilation, stable measurements, and negative family history [American College of Cardiology 2]
• CT or MRI is indicated when echocardiography cannot fully assess aortic morphology [American College of Cardiology 2]

• BAV patients demonstrate predictable patterns of aortic growth, with a mean rate of diameter progression:

  Location	Mean Rate (mm/year)	95% CI
  Sinuses of Valsalva	0.5	0.3-0.7
  Sinotubular junction	0.5	0.3-0.7
  Proximal ascending aorta	0.9	0.6-1.2

  [American College of Cardiology 2]

• Ensure measurements are consistent between imaging modalities, with CT measurements being generally more accurate than echocardiography 4
• If surgery is delayed for any reason, imaging should be performed at least every 6 months given the documented rapid growth rate 4