title: Differences in echocardiographic indices between patients with partial and advanced interatrial conduction delay.
abstract: Partial interatrial block (IAB) (P wave > or =110 ms) is a marker of left atrial abnormality. A similar association among patients with advanced IAB (biphasic P waves > or =110 ms in leads II, III, and aVF) is unknown. The authors screened 27 consecutive patients for advanced IAB with transthoracic echocardiograms (TTEs). Of those, 19 who had repeat TTEs after 2 years formed our study cohort. The authors used 44 consecutive controls with partial IAB who had been similarly screened and had follow-up TTEs 2 years apart. TTE parameters were comparable at baseline between groups but were expectedly different on follow-up. When change (delta value) in these indices was compared, however, only left atrial dimension remained significant (advanced 0.07+/-0.06 mm vs partial IAB 0.03+/-0.06 mm; P=.03). Further study over a longer duration is warranted to ascertain if advanced IAB patients would benefit from follow-up noninvasive cardiac imaging for appropriate risk stratification.
authors.affiliation: Department of Medicine, Division of Cardiology, St Boniface General Hospital/University of Manitoba, Winnipeg, Manitoba, Canada. vignendra@hotmail.com
authors.forename: Vignendra
authors.initials: V
authors.lastname: Ariyarajah
authors.forename: Jaxon
authors.initials: J
authors.lastname: Fernandes
authors.forename: Sirin
authors.initials: S
authors.lastname: Apiyasawat
authors.forename: David H
authors.initials: DH
authors.lastname: Spodick
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001281:Atrial Fibrillation; D016279:Atrial Function, Left; D004452:Echocardiography; D004562:Electrocardiography; D005260:Female; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D007297:Inpatients; D008297:Male; D008404:Massachusetts; D008485:Medical Audit