Document Detail


"Irregular" ventricular parasystole: the influence of sinus rhythm on a parasystolic focus.
MedLine Citation:
PMID:  3336967     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Fifteen cases of ventricular parasystole were analyzed to determine whether the interectopic intervals were regular, as expressed by long intervals being exact multiples of the short ones, or not. The regularity of the interectopic intervals was assessed by means of the variation index: the ratio of the maximal difference between various measurements of the parasystolic cycle length and the mean parasystolic cycle length. Three out of 15 cases had a variation index less than 5, and were classified as "regular parasystole." Twelve cases were associated with a variation index greater than 7.5, and were classified as "irregular parasystole." The cases of irregular parasystole were then analyzed to determine whether the variability of the interectopic intervals was casual or dependent on action of the sinus beats. A parasystolic resetting by critically timed sinus impulses (a form of intermittent parasystole) was evident in three cases. The irregularity in the remaining nine cases was due to modulation (viz., due to electrotonic influence exerted by the sinus beats on the parasystolic focus). In every case of modulated parasystole a phase-response curve was constructed, which enabled an analysis of all the interectopic intervals on the basis of a time-dependent effect exerted by the sinus impulses on an otherwise rhythmic parasystolic focus.
Authors:
G Oreto; G Satullo; F Luzza; A Donato; C M Saccá; F Arrigo; F Consolo; L Schamroth
Related Documents :
18155937 - Community-acquired methicillin-resistant staphylococcus aureus orbital cellulitis in a ...
20963677 - [idiopathic orbital inflammation syndrome in childhood--case report and literature revi...
2404907 - Hemangiopericytoma of the maxillary sinus and skull base.
3340947 - Bacterial aneurysm of the intracavernous carotid artery secondary to suppurative otitis...
2479167 - Duodenal gangliocytic paraganglioma. report of a case and review of the literature.
9065707 - Extensive facial strawberry mark associated with cerebellar hypoplasia and vascular abn...
Publication Detail:
Type:  Case Reports; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American heart journal     Volume:  115     ISSN:  0002-8703     ISO Abbreviation:  Am. Heart J.     Publication Date:  1988 Jan 
Date Detail:
Created Date:  1988-01-28     Completed Date:  1988-01-28     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0370465     Medline TA:  Am Heart J     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  121-33     Citation Subset:  AIM; IM    
Affiliation:
Istituto Pluridisciplinare di Clinica Medica e Terapia Medica Generale e Speciale dell'Universitá degli Studi di Messina, Italy.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Aged
Arrhythmias, Cardiac / physiopathology*
Child
Child, Preschool
Electrocardiography*
Female
Heart Ventricles / physiopathology
Humans
Infant
Male
Middle Aged
Sinoatrial Node / physiopathology*
Systole

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Prevalence and clinical correlates of non-Wenckebach, narrow-complex second-degree atrioventricular ...
Next Document:  Evaluation of Björk-Shiley prosthetic valves by real-time two-dimensional Doppler echocardiographic...