作者单位:Oregon Hlth & Sci Univ, Portland, OR 97201 USA[1]VA Portland Med Ctr, Operat Care Div, Sect Crit Care, Portland, OR USA[2]Univ Kansas Hosp, Dept Cardiothorac Surg, Kansas City, MO USA[3]Loma Linda Univ, Loma Linda, CA 92350 USA[4]OneLegacy, Los Angeles, CA USA[5]