Division of Cardiovascular Medicine, Department of Medicine
Cardiology | Cardiovascular Diseases
Low-flow, low-gradient (LF-LG) aortic stenosis with depressed left ventricular (LV) ejection fraction is a diagnostic challenge that is frequently encountered in the management of valvular heart disease. True-severe LF-LG aortic stenosis is amenable to valve replacement, whereas pseudo-severe aortic stenosis requires management of the underlying cardiomyopathy. This distinction is important as it serves as a critical branch point in guiding therapeutic decisions. We present the case of a 71-year-old male with LF-LG aortic stenosis who had a reduced and biphasic augmentation of LV flow during dobutamine stress echocardiography (DSE). Further evaluation revealed a stenotic left subclavian artery proximal to the left internal mammary artery graft to the left anterior descending (LAD) artery. Bypass of the subclavian stenosis reversed the LAD territory ischemia and confirmed pseudo-severe aortic stenosis on repeat DSE. Traditional DSE parameters are inconclusive in patients with LF-LG aortic stenosis with poor flow reserve. Calculation of the projected orifice area or measurement of aortic valve calcium via multidetector computed tomography (MDCT) may be required in this scenario. Most importantly, reversible causes of LV dysfunction identified during DSE for LF-LG aortic stenosis require a different treatment approach than that of true aortic stenosis.
aortic stenosis, dobutamine, ischemia, low flow, low gradient, transcutaneous aortic valve replacement
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Copyright © 2021, Choudhary et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
DOI of Published Version
Choudhary KV, Kakouros N, Aurigemma GP, Parker MW, Fitzgibbons T. Differentiating Pseudo Versus True Aortic Stenosis in Patients Without Contractile Reserve: A Diagnostic Dilemma. Cureus. 2021 Mar 24;13(3):e14086. doi: 10.7759/cureus.14086. PMID: 33903843; PMCID: PMC8064426. Link to article on publisher's site
Choudhary KV, Kakouros N, Aurigemma GP, Parker M, Fitzgibbons TP. (2021). Differentiating Pseudo Versus True Aortic Stenosis in Patients Without Contractile Reserve: A Diagnostic Dilemma. Open Access Publications by UMMS Authors. https://doi.org/10.7759/cureus.14086. Retrieved from https://escholarship.umassmed.edu/oapubs/4630
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