Antiarrhythmic effects of vasostatin-1 in a canine model of atrial fibrillation.
J Cardiovasc Electrophysiol
; 23(7): 771-7, 2012 Jul.
Article
em En
| MEDLINE
| ID: mdl-22487376
ABSTRACT
BACKGROUND:
We examined the antiarrhythmic effects of vasostatin-1, a recently identified cardioregulatory peptide, in canine models of atrial fibrillation (AF). METHODS ANDRESULTS:
In 13 pentobarbital-anesthetized dogs bilateral thoracotomies allowed the attachment of multielectrode catheters to superior and inferior pulmonary veins and atrial appendages (AA). Rapid atrial pacing (RAP) was maintained for 6 hours. Each hour, programmed stimulation was performed to determine the window of vulnerability (WOV), a measure of AF inducibility, at all sites. During the last 3 hours, vasostatin-1, 33 nM, was injected into the anterior right (AR) ganglionated plexus (GP) and inferior right (IR) GP every 30 minutes (n = 6). Seven dogs underwent 6 hours of RAP only (controls). At baseline, acetylcholine, 100 mM, was applied on the right AA and AF duration was recorded before and after injection of vasostatin-1, 33 nM, into the ARGP and IRGP. In separate experiments (n = 8), voltage-sinus rate response curves (surrogate for GP function) were constructed by applying high-frequency stimulation to the ARGP with incremental voltages with or without vasostatin-1. Vasostatin-1 significantly decreased the duration of acetylcholine-induced AF (11.0 ± 4.1 vs 5.5 ± 2.6 min, P = 0.02). The cumulative WOV (the sum of individual WOVs) significantly increased (P < 0.0001) during the first 3 hours and decreased toward baseline in the presence of vasostatin-1 (P < 0.0001). Cumulative WOV in controls steadily increased. Vasostatin-1 blunted the slowing of sinus rate with increasing stimulation voltage of ARGP.CONCLUSIONS:
Vasostatin-1 suppresses AF inducibility, likely by inhibiting GP function. These data may provide new insights into the role of peptide neuromodulators for AF therapy.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Fragmentos de Peptídeos
/
Fibrilação Atrial
/
Cromogranina A
/
Antiarrítmicos
Tipo de estudo:
Etiology_studies
/
Prognostic_studies
Idioma:
En
Revista:
J Cardiovasc Electrophysiol
Ano de publicação:
2012
Tipo de documento:
Article
País de afiliação:
Estados Unidos