Document Detail


Atrial natriuretic peptides during experimental atrial tachycardia: role of developing tachycardiomyopathy.
MedLine Citation:
PMID:  15333089     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
INTRODUCTION: Atrial tachycardia and chronic heart failure (CHF) are associated with elevated levels of atrial natriuretic peptide (ANP) and its amino terminal part NT-ANP. Chronic high atrial rates may cause CHF due to a rapid ventricular response. The aim of this study was to establish the contribution of elevated atrial rate and of high ventricular rate, resulting in CHF, on ANP and NT-ANP levels during chronic atrial tachycardia. METHODS AND RESULTS: Thirteen goats (AV-paced group) were subjected to 4 weeks of rapid AV pacing with an atrial and ventricular rate of 240 beats/min. Another five goats (A-paced group) were subjected to 4 weeks of atrial pacing at 240 beats/min while the ventricular rate was kept low and regular at 80 beats/min. Pacing was interrupted only for measurement of right atrial (RA) and left ventricular (LV) diameter and sampling for ANP, NT-ANP, and renin. In the AV-paced group, RA and LV diameter reached 152% and 109% of baseline values, respectively. Both ANP and NT-ANP (8.3 +/- 9.2 pmol/L and 0.5 +/- 0.4 nmol/L at baseline, respectively) increased progressively (53.1 +/- 37.9 pmol/L and 2.0 +/- 0.9 nmol/L, respectively, after 4 weeks). There was a significant correlation between the magnitude of atrial dilation and natriuretic peptide levels after 3 days. In A-paced goats, however, RA and LV diameters did not change. Furthermore, ANP and NT-ANP levels (9.1 +/- 6.0 pmol/L and 0.8 +/- 0.2 nmol/L at baseline, respectively) were unchanged after 4 weeks (5.3 +/- 3.4 pmol/L and 0.6 +/- 0.2 nmol/L, respectively). CONCLUSION: Elevated levels of ANPs during chronic atrial tachycardia are related to a high ventricular rate rather than a high atrial rate alone. Rather than atrial tachycardia, the atrial hemodynamic burden is an important determinant of the sustained ANP response.
Authors:
Bas A Schoonderwoerd; Harry J G M Crijns; Dirk J van Veldhuisen; Frans Boomsma; Maarten P van den Berg; Klaas J Bel; Isabelle C van Gelder
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of cardiovascular electrophysiology     Volume:  15     ISSN:  1045-3873     ISO Abbreviation:  J. Cardiovasc. Electrophysiol.     Publication Date:  2004 Aug 
Date Detail:
Created Date:  2004-08-30     Completed Date:  2004-12-02     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  9010756     Medline TA:  J Cardiovasc Electrophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  927-32     Citation Subset:  IM    
Affiliation:
Department of Cardiology, Thoraxcenter, University Hospital Groningen, Groningen, The Netherlands. B.A.Schoonderwoerd@thorax.azg.nl
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MeSH Terms
Descriptor/Qualifier:
Animals
Atrial Natriuretic Factor / blood*
Female
Goats
Heart Failure / blood*,  diagnosis,  etiology,  physiopathology*
Tachycardia, Ectopic Atrial / blood*,  complications,  diagnosis,  physiopathology*
Tachycardia, Ventricular / blood*,  complications,  physiopathology*
Chemical
Reg. No./Substance:
85637-73-6/Atrial Natriuretic Factor
Comments/Corrections
Comment In:
J Cardiovasc Electrophysiol. 2004 Aug;15(8):933-5   [PMID:  15333090 ]

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