unipolar chest lead or V (vector) lead the active electrode is placed on 6 places over chest V1: 4th right intercostal space near sternum. V2: 4th left ICS near to sternum. V3: Between V2 and V4. V4: 5th left ICS (mid clavicular line). V5: 5th left ICS (anterior axillary line). V6: 5th left ICs (mid axillary line) Target Norcet 9🎯 KNO📕