| Reassessment of Q waves in left bundle branch block. | |
| | |
MedLine Citation:
|
PMID: 1262769 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
This study disputes a number of recent reports claiming that abnormal Q waves or a QS configuration in inferior leads (II, III and AVF) coexisting with left bundle branch block is highly suggestive of, and indeed specific for, myocardial infarction. Five patients reported herein demonstrate disappearance of Q waves in inferior leads on spontaneous reversal of LBBB to normal conduction. This necessitates the conclusion that these Q waves represent a postdivisional conduction variant most closely equivalent to left anterior fascicular block coexisting with predivisional LBBB. Absence of inferior R waves in the five patients demonstrating LBBB is explicable by as little as a 20 msec conduction delay in the posterior fascicle coexisting with a higher grade conduction defect in the anterior fascicle. It is concluded that LBBB with a QS configuration in II, III and AVF cannot be considered diagnostic of inferior wall infarction since it regularly results from impaired conduction of the left anterior and possibly the left posterior fascicle (to a lesser extent), which may be reversible. |
| | |
Authors:
|
G C Timmis; V Gangadharan; R G Ramos; S Gordon |
Related Documents
:
|
8903999 - Noninvasive recording of his bundle activity with an analog delay device in normal subj... 6650949 - Left bundle branch block associated with propoxyphene hydrochloride poisoning. 14684169 - H2s generated by heart in rat and its effects on cardiac function. 15860389 - Effects of right bundle branch block during atrioventricular nodal reentrant tachycardia. 6204289 - His bundle recordings using epicardial pacing wires: a new technique. 3652079 - Chronic chagas' heart disease in the elderly: a clinicopathologic study. 19632519 - Impact of intravenous immunoglobulin infusion on longitudinal left ventricular performa... 307979 - Hypothermic coronary perfusion for myocardial protection during aortocoronary bypass. 19317299 - Assessment of local atrial repolarization in a porcine acetylcholine model of atrial fl... |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: Journal of electrocardiology Volume: 9 ISSN: 0022-0736 ISO Abbreviation: J Electrocardiol Publication Date: 1976 Apr |
Date Detail:
|
Created Date: 1976-07-06 Completed Date: 1976-07-06 Revised Date: 2009-11-11 |
Medline Journal Info:
|
Nlm Unique ID: 0153605 Medline TA: J Electrocardiol Country: UNITED STATES |
Other Details:
|
Languages: eng Pagination: 109-14 Citation Subset: IM |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Aged Bundle-Branch Block / complications, diagnosis* Coronary Disease / diagnosis Diagnosis, Differential Electrocardiography* Female Humans Male Middle Aged Myocardial Infarction / complications, diagnosis |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: An enzymatic assay for chloramphenicol with partially purified chloramphenicol acetyltransferase.
Next Document: Computer characterization of sinus rhythm.