Imperial College London

DrZacharyWhinnett

Faculty of MedicineNational Heart & Lung Institute

Reader in Cardiac Electrophysiology
 
 
 
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Contact

 

z.whinnett

 
 
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Location

 

South- NHLI Cardiovascular ScienceBlock B Hammersmith HospitalHammersmith Campus

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Summary

 

Publications

Citation

BibTex format

@article{Leong:2017:10.1161/CIRCEP.117.005107,
author = {Leong, KMW and Ng, FS and yao, C and Roney, C and Linton, N and Whinnett, Z and lefroy, D and Davies, DW and Lim, PB and Harding, S and Peters, N and Kanagaratnam, P and Varnava, A},
doi = {10.1161/CIRCEP.117.005107},
journal = {Circulation: Arrhythmia and Electrophysiology},
title = {ST-Elevation Magnitude Correlates With Right Ventricular Outflow Tract Conduction Delay in Type I Brugada ECG},
url = {http://dx.doi.org/10.1161/CIRCEP.117.005107},
volume = {10},
year = {2017}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Background: The substrate location and underlying electrophysiological mechanisms that contribute to the characteristic ECG pattern of Brugada syndrome (BrS) are still debated. Using noninvasive electrocardiographical imaging, we studied whole heart conduction and repolarization patterns during ajmaline challenge in BrS individuals.Methods and Results: A total of 13 participants (mean age, 44±12 years; 8 men), 11 concealed patients with type I BrS and 2 healthy controls, underwent an ajmaline infusion with electrocardiographical imaging and ECG recordings. Electrocardiographical imaging activation recovery intervals and activation timings across the right ventricle (RV) body, outflow tract (RVOT), and left ventricle were calculated and analyzed at baseline and when type I BrS pattern manifested after ajmaline infusion. Peak J-ST point elevation was calculated from the surface ECG and compared with the electrocardiographical imaging–derived parameters at the same time point. After ajmaline infusion, the RVOT had the greatest increase in conduction delay (5.4±2.8 versus 2.0±2.8 versus 1.1±1.6 ms; P=0.007) and activation recovery intervals prolongation (69±32 versus 39±29 versus 21±12 ms; P=0.0005) compared with RV or left ventricle. In controls, there was minimal change in J-ST point elevation, conduction delay, or activation recovery intervals at all sites with ajmaline. In patients with BrS, conduction delay in RVOT, but not RV or left ventricle, correlated to the degree of J-ST point elevation (Pearson R, 0.81; P<0.001). No correlation was found between J-ST point elevation and activation recovery intervals prolongation in the RVOT, RV, or left ventricle.Conclusions: Magnitude of ST (J point) elevation in the type I BrS pattern is attributed to degree of conduction delay in the RVOT and not prolongation in repolarization time.
AU - Leong,KMW
AU - Ng,FS
AU - yao,C
AU - Roney,C
AU - Linton,N
AU - Whinnett,Z
AU - lefroy,D
AU - Davies,DW
AU - Lim,PB
AU - Harding,S
AU - Peters,N
AU - Kanagaratnam,P
AU - Varnava,A
DO - 10.1161/CIRCEP.117.005107
PY - 2017///
SN - 1941-3084
TI - ST-Elevation Magnitude Correlates With Right Ventricular Outflow Tract Conduction Delay in Type I Brugada ECG
T2 - Circulation: Arrhythmia and Electrophysiology
UR - http://dx.doi.org/10.1161/CIRCEP.117.005107
UR - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000413093000003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR - http://hdl.handle.net/10044/1/53934
VL - 10
ER -