In this investigator-initiated study, which was conducted without industry support, 11 sites participated. Most were relatively low-volume centers with fewer than 150 TAVR procedures performed annually, according to Dr. Waksman. The choice of TAVR device was left to the discretion of the operator.
Reflecting a lower-risk population, the mean age of 74.6 years is younger than that of participants in previous TAVR trials. The mean left ventricular ejection fraction was 62.9%. Only 4.8% had a prior MI and 19.2% had a prior coronary artery bypass graft. Most procedures were performed under conscious sedation with fewer than 20% receiving general anesthesia. The mean fluoroscopy time was 16 minutes.
The degree of improvement in hemodynamics following TAVR in this population was called “excellent,” but Dr. Waksman did report a 12.5% incidence of hypo-attenuating leaflet thickening (HALT), an 11% incidence of reduced leaflet motion, and a 9.3% incidence of hypo-attenuation affecting motion. All were subclinical effects.
In a closer analysis of HALT, the rate was 14.4% in the 80.8% of patients who received antiplatelet therapy versus 4.8% in the 17.5% who received oral anticoagulation (some received neither). Dr. Waksman called the greater association of HALT with antiplatelet therapy “a potential signal” that deserves further study.