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Observations of Interatrial Conduction in Healthy Individuals Using Signal-averaged P-wave ECG: A Clinical Perspective

Havmöller, Rasmus LU (2009) In Lund University Faculty of Medicine Doctoral Dissertation Series 2009:54.
Abstract
Disturbances of interatrial conduction are linked to supraventricular arrhythmias. Previous studies have shown that these disturbances can be detected non-invasively as distinctive appearances of the orthogonal P wave using signal-averaged P-wave analysis (PSAECG). Orthogonal recordings (VCG) are however scarce in clinical practice for practical reasons. The aim of the presented study was to explore the possibility of mathematically transforming conventional 12-lead ECGs into orthogonal P-wave data with preserved information content regarding P-wave morphology. If feasible, the method would then be used to analyse P-wave data from healthy adult men and women of all ages in order to provide a first reference material of the “normal” P wave... (More)
Disturbances of interatrial conduction are linked to supraventricular arrhythmias. Previous studies have shown that these disturbances can be detected non-invasively as distinctive appearances of the orthogonal P wave using signal-averaged P-wave analysis (PSAECG). Orthogonal recordings (VCG) are however scarce in clinical practice for practical reasons. The aim of the presented study was to explore the possibility of mathematically transforming conventional 12-lead ECGs into orthogonal P-wave data with preserved information content regarding P-wave morphology. If feasible, the method would then be used to analyse P-wave data from healthy adult men and women of all ages in order to provide a first reference material of the “normal” P wave for future studies.

Study I evaluated the feasibility of lead conversion (ECG into VCG) in both healthy individuals and arrhythmia patients. The study compared P waves from recorded and derived VCG and it was found that information of interatrial conduction disturbances is preserved. Study II further evaluated this method in a similar material. Different variations of ECG data mimicking true clinical conditions were explored regarding the preservation of P-wave data. It was found that PSAECG is a robust analysis method also in a proposed clinical setting.

Study III and IV were devoted to the analysis of P-wave data retrieved from a large material of healthy individuals using the previously validated method. The main finding of Study III was that P-wave morphologies previously observed in arrhythmia patients were commonly observed also in this normal population. The changes were, however, mostly found in the higher age groups, which is in keeping with the known fact that many arrhythmias are more common with increasing age. In Study IV, a long-term follow-up of the “normal” P-wave morphology was conducted, where it was found that P-wave morphology is mostly unaltered after three years. However, in a small number of individuals, discrete changes were observed that support the theory that age-related changes influence interatrial conduction and may implore susceptibility for developing arrhythmias.

The presented study adds to the increasing knowledge about interatrial conduction. It provides a validated method for non-invasive exploration of he impulse propagation and also a reference material of the “normal” signal-averaged P-wave morphology. (Less)
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author
supervisor
opponent
  • Prof Bergfeldt, Lennart, Dept of Cardiology, Sahlgrenska University Hospital, Gothenburg, Sweden
organization
publishing date
type
Thesis
publication status
published
subject
keywords
signal-averaged, interatrial conduction, orthogonal, P-wave, ECG, healthy
in
Lund University Faculty of Medicine Doctoral Dissertation Series
volume
2009:54
pages
152 pages
publisher
Faculty of Medicine, Lund University
defense location
Lecture room 1, Lund University Hospital
defense date
2009-05-27 09:00
ISSN
1652-8220
ISBN
978-91-86253-42-4
language
English
LU publication?
yes
id
99692420-8362-4d20-8fea-9f0b5e66391a (old id 1391665)
date added to LUP
2009-05-05 13:08:32
date last changed
2016-09-19 08:44:47
@phdthesis{99692420-8362-4d20-8fea-9f0b5e66391a,
  abstract     = {Disturbances of interatrial conduction are linked to supraventricular arrhythmias. Previous studies have shown that these disturbances can be detected non-invasively as distinctive appearances of the orthogonal P wave using signal-averaged P-wave analysis (PSAECG). Orthogonal recordings (VCG) are however scarce in clinical practice for practical reasons. The aim of the presented study was to explore the possibility of mathematically transforming conventional 12-lead ECGs into orthogonal P-wave data with preserved information content regarding P-wave morphology. If feasible, the method would then be used to analyse P-wave data from healthy adult men and women of all ages in order to provide a first reference material of the “normal” P wave for future studies.<br/><br>
Study I evaluated the feasibility of lead conversion (ECG into VCG) in both healthy individuals and arrhythmia patients. The study compared P waves from recorded and derived VCG and it was found that information of interatrial conduction disturbances is preserved. Study II further evaluated this method in a similar material. Different variations of ECG data mimicking true clinical conditions were explored regarding the preservation of P-wave data. It was found that PSAECG is a robust analysis method also in a proposed clinical setting. <br/><br>
Study III and IV were devoted to the analysis of P-wave data retrieved from a large material of healthy individuals using the previously validated method. The main finding of Study III was that P-wave morphologies previously observed in arrhythmia patients were commonly observed also in this normal population. The changes were, however, mostly found in the higher age groups, which is in keeping with the known fact that many arrhythmias are more common with increasing age. In Study IV, a long-term follow-up of the “normal” P-wave morphology was conducted, where it was found that P-wave morphology is mostly unaltered after three years. However, in a small number of individuals, discrete changes were observed that support the theory that age-related changes influence interatrial conduction and may implore susceptibility for developing arrhythmias.<br/><br>
The presented study adds to the increasing knowledge about interatrial conduction. It provides a validated method for non-invasive exploration of he impulse propagation and also a reference material of the “normal” signal-averaged P-wave morphology.},
  author       = {Havmöller, Rasmus},
  isbn         = {978-91-86253-42-4},
  issn         = {1652-8220},
  keyword      = {signal-averaged,interatrial conduction,orthogonal,P-wave,ECG,healthy},
  language     = {eng},
  pages        = {152},
  publisher    = {Faculty of Medicine, Lund University},
  school       = {Lund University},
  series       = {Lund University Faculty of Medicine Doctoral Dissertation Series},
  title        = {Observations of Interatrial Conduction in Healthy Individuals Using Signal-averaged P-wave ECG: A Clinical Perspective},
  volume       = {2009:54},
  year         = {2009},
}