Area and Gradient Mismatch: The Discordance of a Small Valve Area and Low Gradients
| Autor: | Amr E. Abbas, Frances O. Wood, Laura M. Franey, Steven J. Lester |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
medicine.medical_specialty
Ejection fraction medicine.diagnostic_test business.industry Hemodynamics macromolecular substances Doppler echocardiography medicine.disease Stenosis Aortic valve area Valvular stenosis Aortic valve replacement Internal medicine medicine Cardiology Clinical severity business |
| Zdroj: | Aortic Stenosis ISBN: 9781447152415 |
| DOI: | 10.1007/978-1-4471-5242-2_8 |
| Popis: | While the clinical severity of aortic stenosis (AS) is based largely on symptoms, indications for surgical aortic valve replacement (SAVR) and/or transcutaneous (TAVR) rely upon calculated estimates of the hemodynamic significance and degree of valvular stenosis. Severe AS is defined as an aortic valve area (AVA) 40 mmHg, and/or peak trans-aortic velocity >4 m/s by Doppler echocardiography. Whether the above conditions must be met individually or collectively remains unclear. As noted, “area/gradient match” occurs when both the AVA and ∆P fall within the severe range. This may occur regardless of the presence of normal or abnormal ejection fraction and regardless of the presence or absence of low flow (defined as a stroke volume index on echocardiography |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|