The use of mechanical circulatory support (MCS) for pediatric patients undergoing heart surgery was analyzed. Of over 96,000 operations, 2.4% were associated with MCS use. MCS use was associated with younger patients, a greater number of preoperative risk factors, and certain operations (Norwood, complex biventricular repair). Mortality associated with MCS was over 50%. MCS rates differed substantially across participating institutions.
