Aortic Stenosis Management

Diagnosis and Assessment

• Echocardiography is the cornerstone of evaluation, sufficient for guiding management in 65-70% of patients with aortic stenosis, according to the American Heart Association 1
• Multimodality imaging may be required in 25-30% of cases where echocardiographic findings are uncertain, as recommended by the American College of Cardiology 1
• Severe aortic stenosis is defined by an aortic valve area less than 1.0 cm², mean pressure gradient greater than 40 mmHg, and peak velocity greater than 4 m/s, as defined by the American Heart Association 1, 2

Treatment Algorithm Based on Symptom Status

• Valve replacement, either surgical aortic valve replacement or transcatheter aortic valve replacement, is strongly recommended for all symptomatic patients with severe aortic stenosis, according to the American College of Cardiology 3, 4
• Without treatment, average survival is reduced to 2-3 years once symptoms develop in patients with severe aortic stenosis, as reported by the American Heart Association 1
• Decision between surgical aortic valve replacement and transcatheter aortic valve replacement depends on surgical risk assessment, patient age, frailty, anatomical considerations, and comorbidities, as recommended by the American College of Cardiology 3, 4, 5

Surgical Risk Assessment for Intervention Type

• Low surgical risk patients, with a Society of Thoracic Surgeons Predicted Risk of Mortality score less than 4%, generally undergo surgical aortic valve replacement, especially in younger patients, as recommended by the American College of Cardiology 4
• Intermediate surgical risk patients, with a score between 4-8%, may undergo either surgical aortic valve replacement or transcatheter aortic valve replacement based on patient factors, as recommended by the American College of Cardiology 4
• High surgical risk patients, with a score greater than 8%, generally undergo transcatheter aortic valve replacement, as recommended by the American College of Cardiology 3, 4

Special Considerations

• Low-flow, low-gradient aortic stenosis requires confirmation of true stenosis severity using dobutamine stress echocardiography or multi-slice computed tomography, as recommended by the European Society of Cardiology 1, 2, 6
• Intervention is recommended if true severe aortic stenosis is confirmed and flow reserve is present, as recommended by the European Society of Cardiology 6
• For patients with severe aortic stenosis and coronary artery disease, surgical aortic valve replacement plus coronary artery bypass grafting is appropriate for most patients, as recommended by the American College of Cardiology 5
• For patients with severe aortic stenosis and other valve disease, a surgical approach is generally preferred unless high surgical risk, as recommended by the American College of Cardiology 5

Pitfalls and Caveats

• Symptoms may be difficult to ascertain in elderly patients with aortic stenosis due to comorbidities or reduced mobility, as noted by the European Society of Cardiology 6
• Exercise testing can unmask symptoms in apparently asymptomatic patients with aortic stenosis, as recommended by the American College of Cardiology 5
• Medical futility should be considered in patients with life expectancy less than 1 year or severe dementia, as recommended by the American College of Cardiology 5
• Palliative balloon aortic valvuloplasty may be considered in select patients with limited life expectancy, as recommended by the American College of Cardiology 5

Medical Management of Aortic Stenosis

Initial Management Approach

• The European Society of Cardiology recommends that the initial medical management for patients with aortic stenosis should focus on careful hemodynamic monitoring, heart rate control, and fluid management, while preparing for definitive treatment with valve replacement in symptomatic patients with severe disease 7, 8

Medical Management

• Heart rate control is essential, as both bradycardia and tachycardia can lead to clinical decompensation, according to the European Heart Journal 8
• Careful fluid management is needed to maintain adequate preload without volume overload, as stated by the European Heart Journal 8
• Blood pressure control should be achieved cautiously, with target systolic blood pressure between 100-120 mmHg in acute settings, as recommended by the European Heart Journal 9
• Beta-blockers are preferred agents for blood pressure control due to their ability to reduce the force of left ventricular ejection, according to the European Heart Journal 9
• Calcium channel blockers may be considered for blood pressure control in patients with obstructive pulmonary disease, as suggested by the European Heart Journal 9

Perioperative Management for Non-Cardiac Surgery

• In patients with severe aortic stenosis requiring urgent non-cardiac surgery, careful hemodynamic monitoring is essential, as recommended by the European Heart Journal 7, 8
• For elective non-cardiac surgery in symptomatic patients, aortic valve replacement should be considered first, according to the European Heart Journal 8
• In asymptomatic patients, elective non-cardiac surgery can be performed safely, though there is a risk of worsening heart failure, as stated by the European Heart Journal 8
• If non-cardiac surgery involves large volume shifts, aortic valve replacement should be considered before the non-cardiac procedure, as suggested by the European Heart Journal 8

Initial Management of Aortic Stenosis

Baseline Clinical Data Collection

• The American College of Cardiology recommends obtaining physical examination, standard blood tests, pulmonary function tests, electrocardiogram, complete blood count, basic metabolic profile, coagulation studies, troponin, brain natriuretic peptide, type and screen, and chest radiograph for patients with aortic stenosis 10
• Documenting any previous reactions to contrast agents or latex, and medication allergies is crucial for patients with aortic stenosis 10
• Performing carotid ultrasound when indicated is recommended for patients with aortic stenosis 10
• Obtaining dental evaluation with treatment of any acute issues prior to valve intervention is necessary to prevent prosthetic valve endocarditis 10

Heart Valve Team Approach

• The American College of Cardiology suggests assembling a Heart Valve Team including cardiologists with valvular expertise, structural interventional cardiologists, imaging specialists, cardiovascular surgeons, cardiovascular anesthesiologists, and nursing professionals for patients with aortic stenosis 10, 11
• The Heart Valve Team must review medical condition and valve severity, determine which interventions are indicated, technically feasible, and reasonable, and discuss benefits and risks with patient and family 10, 12
• Establishing patient goals and expectations early, including discussions of life expectancy, anticipated improvement in symptoms or survival, and end-of-life constructs when appropriate, is essential for patients with aortic stenosis 10, 12, 11

Cardiovascular Comorbidity Assessment

• Performing coronary angiography in all patients being considered for intervention is recommended, as coronary artery disease is present in 40-75% of patients with aortic stenosis 10, 12, 11
• The Heart Valve Team should decide whether to revascularize before valve replacement on a case-by-case basis using individual anatomic, clinical, and physiological characteristics 10, 12
• Evaluating for left ventricular systolic or diastolic dysfunction, severe mitral regurgitation or stenosis, and severe pulmonary hypertension by echocardiography is necessary for patients with aortic stenosis 12
• Reviewing previous cardiac surgical procedures or transcatheter interventions is crucial, as these may affect the planned intervention 10, 12

Special Clinical Scenarios

• For patients with severe aortic stenosis and coronary artery disease, revascularization with percutaneous coronary intervention or coronary artery bypass graft in addition to TAVR did not increase the risk of death or disabling stroke at 2-year follow-up 10, 12
• Considering medical futility in patients with life expectancy <1 year or severe dementia before proceeding with intervention is essential 11
• Evaluating social support, particularly with respect to transportation and recovery, before proceeding with intervention is necessary 10