BRENTWOOD, Tenn. & TULSA, Okla.–(BUSINESS WIRE)–Oklahoma Heart Institute (OHI), part of Hillcrest HealthCare System and Ardent Health (NYSE: ARDT), is now the only site in Oklahoma and the surrounding region participating in several leading national cardiovascular trials – and recently became the first in the United States to use the next-generation Supira percutaneous left ventricular assist device (pVAD) as part of the SUPPORT II clinical trial. Through this research, OHI is expanding acces