Health Ultrasound tracks down misfiring heart sites Share: Science Highlights March 19, 2021 New technique improves diagnosis and treatment of abnormal heart rhythms Abnormal heart rhythms—cardiac arrhythmias—are a major worldwide health problem. Now scientists are using ultrasound for more accurate maps of arrhythmic sites in the heart for improved success of ablation procedures. Common and often life-threatening, arrythmias can develop when regions of the heart send aberrant electrical signals that disrupt the normal beating of the heart. An effective procedure for fixing this problem involves stealth-like killing of the misfiring regions, known as catheter ablation. The procedure involves feeding into the heart a catheter that uses radiofrequency energy (similar to microwave heat) to destroy the areas causing the irregular heartbe