@echomadame: Complete heart block (third-degree AV block) is a serious, potentially life-threatening condition where electrical signals fail to pass from the heart's upper to lower chambers, leading to independent, slow rhythms. It causes severe bradycardia (slow heart rate), syncope (fainting), dizziness, and shortness of breath. Treatment typically requires a permanent pacemaker.#cardiology #echo #ultrasound #heart #sonographer