An important trend shown in the present analysis is that although aortic valve (AV) gradients measured in TTE are still defined as severe AS, the average peak and pressure gradients are in fact lower in recent years than gradients documented in earlier years.
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Temporal Trends in Patient Characteristics and Clinical Outcomes of TAVR: Over a Decade of Practice.
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The sentences
Though valve-in-valve (VIV) procedures became more common, reaching about 6% of procedures in the last quartile, this did not reach statistical significance. 3.3.