What a Bystander was Taught Saves a Teacher’s Life
Written by Tom SirmonsUpdated October 2026 with current CPR and AED guidance. When paramedics arrived at Sarah Zumwalt Middle School in Dallas, they found a teacher in cardiac arrest. His heart was in ventricular fibrillation, or VF, a dangerous rhythm that can cause the heart to stop pumping blood effectively. But something important had already […]














