Precordial concordance

{{Orphan|date=July 2019}}

{{context|date=November 2018}}

{{short description|Electrocardiogram status and indicator of heart health}}

Precordial concordance, also known as QRS concordance is when all precordial leads on an electrocardiogram are either positive (positive concordance) or negative (negative concordance).{{cite book |last1=Kusumoto |first1=Fred M. |title=ECG Interpretation: From Pathophysiology to Clinical Application |date=2009 |publisher=Springer Science & Business Media |isbn=9780387888804 |page=192 |url=https://books.google.com/books?id=wQ6Ivvhvy-AC&pg=PA192 |language=en}} When there is a negative concordance, it almost always represents a life-threatening condition called ventricular tachycardia because there is no other condition that suggests any abnormal conduction from the apex of the heart to the upper parts. However, in positive concordance another rare conditions such as left side accessory pathways or blocks are also possible.{{cite book |last1=Issa |first1=Ziad F. |last2=Miller |first2=John Michael |last3=Zipes |first3=Douglas P. |title=Clinical Arrhythmology and Electrophysiology: A Companion to Braunwald's Heart Disease |date=2009 |publisher=Elsevier Health Sciences |isbn=978-1416059981 |page=395 |url=https://books.google.com/books?id=a8s8nd2JAiwC&pg=PA395 |language=en}}