Open AccessThe Lewis Lead for Detection of Ventriculoatrial Conduction Type
Author(s) -
Huemer Martin,
Meloh Henning,
Attanasio Philipp,
Wutzler Alexander,
Parwani Abdul S.,
Matsuda Hisao,
Blaschke Florian,
Boldt LeifHendrik,
Haverkamp Wilhelm
Publication year - 2016
Publication title -
clinical cardiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.263
H-Index - 72
eISSN - 1932-8737
pISSN - 0160-9289
DOI - 10.1002/clc.22505
Subject(s) - medicine , cardiology , qrs complex , intracardiac injection , lead (geology) , ventricle , tachycardia , orthodromic , ventricular tachycardia , electrocardiography , electrophysiology , geomorphology , geology
Background Identification of a possible ventriculoatrial ( VA ) dissociation in wide QRS complex tachycardias is one of the most reliable criteria for differentiation of tachycardia origin. The Lewis lead has been proposed for detection of atrial activity during ventricular tachycardias. Hypothesis A modified Lewis‐lead‐ECG will be superior to the standard‐lead ECG for detection of ventriculoatrial conduction during ventricular tachycardia. Methods Forty‐seven patients underwent electrophysiological study, stimulated with a fixed cycle length of 400 ms in the ventricle. During stimulation, a standard‐lead ECG and a modified Lewis‐lead ECG were recorded. Simultaneously, VA conduction was documented by intracardiac electrograms. Surface ECGs were presented to 6 blinded examiners for VA conduction assessment. Results Type of VA conduction was correctly diagnosed in significantly more ECGs in the Lewis‐lead ECG group (mean, 35.0 [75%]) than in the standard‐lead ECG group (mean, 29.2 [62%]; P = 0.045). Ventriculoatrial dissociation also was significantly more often correctly diagnosed in the Lewis‐lead ECG group (mean, 17.7 [71%]) than in the standard‐lead ECG group (mean, 12.7 [49%]; P = 0.014). Interobserver agreement was moderate in both groups (κ = 0.45 and κ = 0.49, respectively). Conclusions Compared with standard‐lead ECG , modified Lewis‐lead ECG is associated with significantly improved detection of VA conduction type during fast ventricular pacing and thus may help improve ECG diagnosis.