Atlantis sr pro2

IVUS was performed with a 40‐MHz mechanical transducer ultrasound catheter (Atlantis SR Pro2, Boston Scientific, Natick, MA) in the LAD. An automated and manual pullback at 0.5 mm/s was performed, and the IVUS images were stored onto DVD for offline analysis. Standard 2- and 3-dimensional measurements were performed as previously described.^{18 (link)} All measurements were performed by the Stanford Cardiovascular Core Analysis Laboratory, blinded to clinical, physiologic, and angiographic information.
The presence of a myocardial bridge (MB) was defined by IVUS, by either the presence of an echo-lucent halo and/or ≥10% systolic compression during the cardiac cycle.^{19 (link)}

In all patients, a commercially available 40 MHz IVUS catheter (Atlantis SR Pro 2^® or OptiCross^®; Boston scientific, Natick, Massachusetts) was advanced over the coronary guidewire to the mid to distal LAD. A recording was performed using an automated motorized pullback (0.5 mm/s) of the IVUS catheter. IVUS imaging was analyzed offline by an independent core laboratory (Cardiovascular Core Analysis Laboratory, Stanford, California) blinded to the patient’s clinical and randomization information, using commercially available 3-dimensional reconstruction software (echoPlaque 4.0^®; INDEC Medical Systems, Santa Clara, California). Lumen and vessel contours were traced with 1 mm axial intervals for the first 50 mm from the ostium of the LAD. For volumetric analyses, lumen and vessel volumes were calculated using Simpson’s rule and divided by the axial analyzed length (mm³) to adjust for any differences of analyzed longitudinal lengths among the cases. Plaque volume was defined as vessel volume – lumen volume; percent plaque volume (%) was defined as 100 x plaque volume/vessel volume. Maximal intimal thickness (MIT) was also obtained from the interpolated data set as a 2-dimensional IVUS index.