Effects of the Selective Stretch-Activated Channel Blocker GsMtx4 on Stretch-Induced Changes in Refractoriness in Isolated Rat Hearts and on Ventricular Premature Beats and Arrhythmias after Coronary Occlusion in Swine
Barrabés, José A.. (Hospital Universitari Vall d'Hebron. Institut de Recerca)
Inserte, Javier (Hospital Universitari Vall d'Hebron. Institut de Recerca)
Agulló, Luis (Hospital Universitari Vall d'Hebron. Institut de Recerca)
Rodríguez-Sinovas, Antonio (Hospital Universitari Vall d'Hebron. Institut de Recerca)
Alburquerque-Béjar, Juan Jos. (Hospital Universitari Vall d'Hebron. Institut de Recerca)
García-Dorado, David (Hospital Universitari Vall d'Hebron. Institut de Recerca)
Universitat Autònoma de Barcelona

Date:	2015
Abstract:	Mechanical factors may contribute to ischemic ventricular arrhythmias. GsMtx4 peptide, a selective stretch-activated channel blocker, inhibits stretch-induced atrial arrhythmias. We aimed to assess whether GsMtx4 protects against ventricular ectopy and arrhythmias following coronary occlusion in swine. First, the effects of 170-nM GsMtx4 on the changes in the effective refractory period (ERP) induced by left ventricular (LV) dilatation were assessed in 8 isolated rat hearts. Then, 44 anesthetized, open-chest pigs subjected to 50-min left anterior descending artery occlusion and 2-h reperfusion were blindly allocated to GsMtx4 (57 μg/kg iv. bolus and 3. 8 μg/kg/min infusion, calculated to attain the above concentration in plasma) or saline, starting 5-min before occlusion and continuing until after reflow. In rat hearts, LV distension induced progressive reductions in ERP (35±2, 32±2, and 29±2 ms at 0, 20, and 40 mmHg of LV end-diastolic pressure, respectively, P<0. 001) that were prevented by GsMTx4 (33±2, 33±2, and 32±2 ms, respectively, P=0. 002 for the interaction with LV end-diastolic pressure). Pigs receiving GsMtx4 had similar number of ventricular premature beats during the ischemic period as control pigs (110±28 vs. 103±21, respectively, P=0. 842). There were not significant differences among treated and untreated animals in the incidence of ventricular fibrillation (13. 6 vs. 22. 7%, respectively, P=0. 696) or tachycardia (36. 4 vs. 50. 0%, P=0. 361) or in the number of ventricular tachycardia episodes during the occlusion period (1. 8±0. 7 vs. 5. 5±2. 6, P=0. 323). Thus, GsMtx4 administered under these conditions does not suppress ventricular ectopy following coronary occlusion in swine. Whether it might protect against malignant arrhythmias should be tested in studies powered for these outcomes.
Grants:	Ministerio de Economía y Competitividad PI12/01844 Ministerio de Economía y Competitividad SAF 2008-3067
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	PloS one, Vol. 10 (may 2015) , ISSN 1932-6203

DOI: 10.1371/journal.pone.0125753
PMID: 25938516

15 p, 2.0 MB

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