May 12, 2021 Though they’re called resuscitated sudden cardiac arrests, many such events do not, in fact, have an underlying cardiac cause, which has implications for both patient care and clinical research, investigators have found. Of patients who suffered an out-of-hospital cardiac arrest (OHCA) and survived long enough to be hospitalized in San Francisco County over a roughly 4-year span, most (69.1%) had an underlying arrhythmic cause, but a sizeable minority (27.1%) had noncardiac conditions to blame. Another 3.8% were classified as “nonarrhythmic/cardiac.” The distinction mattere...