For cardiac emergencies, St. John's Regional Medical Center is available 24/7 with highly specialized cardiac caregivers and staff experienced in the diagnoses and treatment in complex heart procedures. St. John’s Regional Medical Center is a designated STEMI Receiving Center (SRC). A STEMI, also known as a heart attack, occurs when plaque in an artery blocks blood flow to the heart. SJRMC meets stringent standards set by Ventura County Emergency Services (EMS). As an SRC, when emergency medical personnel confirm a heart attack/STEMI diagnosis, the patient is transported to SJRMC for treatment. A STEMI usually requires aggressive treatment in a timely manner to prevent permanent heart damage.