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- Negative concordance in electrocardiography refers to the situation where all precordial leads (V1 – V6) show a negative QRS complex1234. It is suggestive of ventricular tachycardia (VT) originating from the apical area23. The presence of negative concordance is almost diagnostic of VT, but it is only present in 20% of VTs4.
Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.It means that ALL the precordial leads (V1 – V6) have MONOMORPHIC QRS complexes on the same side of the baseline (in this case, all MONOMORPHIC R’s). “Negative concordance” means all MONOMORPHIC QS waves. There is NO allowance for tiny q waves or tiny s waves. Nor does it mean that at least four of the leads are upright or inverted.medicusofhouston.com/wp-content/uploads/2021/1…A negative concordance is present when all precordial leads show a negative QRS complex and is suggestive of VT originating from the apical area.johnsonfrancis.org/professional/diagnosis-of-ventric…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.en.wikipedia.org/wiki/Precordial_concordanceThe presence of negative chest lead concordance (i.e. when all QRS complexes in leads V1–V6 are negative) is almost diagnostic of VT, with a specificity of >90%, but is only present in 20% of VTs (Figure 1). Positive concordance can be indicative of VT or an antidromic tachycardia utilising a left posterior or left lateral accessory pathway. 10www.aerjournal.com/articles/differential-diagnosis-… - People also ask
VT versus SVT • LITFL Medical Blog • ECG Library Basics
WEBMar 19, 2023 — Negative concordance in VT: Leads V1-6 show entirely negative (QS) complexes, with no rS complexes seen. RSR’ complexes with a taller left rabbit ear: This is the most specific finding in favour of VT. This is in contrast to RBBB, where the right …
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WEBNegative concordance (all QRS complexes being negative) strongly suggest ventricular tachycardia). Positive concordance (all QRS complexes being positive) are mostly due to ventricular tachycardia but may be …
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WEBMay 23, 2023 — Precordial concordance (a lack of RS complex in V1-6) is 97% specific for VT. Positive concordance (left) refers to entirely positive complexes in lead V1-6, with …
- Studies of negative concordance vt
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WEBMar 19, 2023 — Below are some examples of positive and negative concordance, and Brugada’s and Josephson’s sign. For more examples of the other suggestive features, …
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WEBMay 19, 2020 — In general, WCTs demonstrating positive concordance most often arise from VT originating from the posterobasal left ventricle. On the other hand, WCTs demonstrating negative concordance are practically …
Brugada's algorithm for distinguishing ventricular tachycardia (VT ...
WEBBrugada’s algorithm is the most used algorithm for distinguishing ventricular tachycardia (VT) and supraventricular tachycardia (SVT) with wide QRS complex. The algorithm …
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WEBMar 19, 2023 — Negative concordance: At least 90% likelihood of VT. Absence of any precordial RS pattern: almost 100% specific for VT. therapy for wide-complex …
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WEBPrecordial lead concordance: both positive and negative concordance in the precordial leads are suggestive of VT. Concordance describes uniform polarity of the QRS …
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WEBMar 11, 2005 — Negative concordance is seen during VT that arises from the anteriormost regions of the ventricle, typically in anterior apical infarction. Positive concordance is …
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WEBSep 23, 2013 — Negative QRS deflection in V6 favours VT. So our patient has some features that superficially resemble VT, that too VT of epicardial origin. (Such as pseudo …
WEBConversely, negative concordance is seen only in VTs originating near the apical septum, such that all electrical activity moves away from the chest wall. The latter is seen most …
Negative precordial concordance: Is it a ... - Heart Rhythm
WEBFeb 28, 2008 — The QRS complexes recorded in leads V 1 to V 6 exhibited a negative concordance during the wide QRS complex tachycardia, which is known to be a specific …
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WEBMar 24, 2022 — A negative concordance is present when all precordial leads show a negative QRS complex and is suggestive of VT originating from the apical area. Positive …
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WEBSep 28, 2020 — The presence of negative chest lead concordance (i.e. when all QRS complexes in leads V1–V6 are negative) is almost diagnostic of VT, with a specificity of …
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WEBNov 27, 2015 — With VT, there is often positive or negative concordance in the chest leads, with entirely positive (R) or entirely negative (QS) waves in leads V1–V6, thus …
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WEBNegative concordance is considered diagnostic of a ventricular tachycardia arising from the apical area of the left ventricle. 1 However, rare exceptions to this rule have been …
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WEBJan 12, 2024 — VT is more common generally (80%, but up to 95% in IHD). VT is more likely with extreme right axis, minor rate variation and chest lead concordance. SVT is more …
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WEBMar 3, 2002 — Positive concordance probably indicates that the origin of the tachycardia lies on the posterior ventricular wall; the wave of depolarisation moves towards all the …
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WEBAug 18, 2007 — Therefore, positive precordial concordance does not discriminate between VT and SVT with aberrant conduction. Negative precordial concordance is nearly always …
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WEBJan 12, 2024 — Positive or negative concordance throughout the chest leads, i.e. leads V1-6 show entirely positive (R) or entirely negative (QS) complexes, with no RS complexes …
Examples of positive and negative chest lead concordance in VT.
WEBContext 1. ... presence of negative chest lead concordance (all QRS complexes negative V1ÀV6) ( Figure 3) is almost diagnostic of VT, with a specificity >90%, but is only present …
Discrimination of ventricular tachycardia and localization of its exit ...
WEBDifferential diagnosis of supraventricular tachycardia (SVT) and ventricular tachycardia (VT) is of paramount importance for appropriate patient management. Several diagnostic …
Current Algorithms for the Diagnosis of wide QRS Complex …
WEBNegative concordance, when strictly defined (QRS complexes are negative i. e. QS complexes are present in all precordial leads), nearly always caused by VT.
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