Intracoronary infusion of Gd3+ into ischemic region does not suppress phase Ib ventricular arrhythmias after coronary occlusion in swine. Export

@article{citeulike:690906, abstract = {Increased mechanical tension in the ischemic region during acute coronary occlusion might favor the occurrence of phase Ib ventricular arrhythmias. We aimed to investigate whether intracoronary administration of Gd(3+), a stretch-activated channel blocker, into the ischemic zone reduces the incidence of these arrhythmias. In thiopental-anesthetized, open-chest pigs, the left anterior descending coronary artery (LAD) was ligated for 45 or 48 min. Phosphate-free, HEPES-buffered saline bubbled with 100\% N(2) was infused into the ischemic region for 4 min, starting 5 min (series A; n = 16) or 20 min (series B; n = 16) after coronary occlusion, at a rate doubling the baseline blood flow. Animals were blindly allocated to receive 40 muM Gd(3+) or only the buffer during the final 2 min of the infusion. There were no differences between groups with respect to hemodynamic variables, plasma K(+) levels, or size of the ischemic region. In neither series was the number of phase Ib premature ventricular beats reduced by Gd(3+) (46 +/- 20 in untreated vs. 91 +/- 37 in Gd(3+)-treated animals in series A and 19 +/- 7 vs. 22 +/- 13, respectively, in series B; both P = not significant). The occurrence of ventricular tachycardia or fibrillation was significantly associated with the magnitude of early ischemic expansion of the LAD region, as measured by ultrasonic crystals, but was also not prevented by Gd(3+). These results argue against a major role of stretch-activated channels inside the area at risk in the genesis of phase Ib ischemic ventricular arrhythmias.}, address = {Servicio de Cardiolog\'{\i}a, Hospital Universitari Vall d'Hebron, Pg. Vall d'Hebron 119-129, E-08035 Barcelona, Spain.}, author = {Barrab\'{e}s, J. A. and Garcia-Dorado, D. and Agull\'{o}, L. and Rodr\'{\i}guez-Sinovas, A. and Padilla, F. and Trobo, L. and Soler-Soler, J.}, citeulike-article-id = {690906}, citeulike-linkout-0 = {http://dx.doi.org/10.1152/ajpheart.00917.2005}, citeulike-linkout-1 = {http://view.ncbi.nlm.nih.gov/pubmed/16387793}, citeulike-linkout-2 = {http://www.hubmed.org/display.cgi?uids=16387793}, doi = {10.1152/ajpheart.00917.2005}, issn = {0363-6135}, journal = {Am J Physiol Heart Circ Physiol}, keywords = {ib, iks, ischemia}, month = {June}, number = {6}, posted-at = {2006-06-09 10:56:35}, priority = {5}, title = {Intracoronary infusion of Gd3+ into ischemic region does not suppress phase Ib ventricular arrhythmias after coronary occlusion in swine.}, url = {http://dx.doi.org/10.1152/ajpheart.00917.2005}, volume = {290}, year = {2006} }

TY - JOUR ID - citeulike:690906 L3 - citeulike-article-id:690906 N2 - Increased mechanical tension in the ischemic region during acute coronary occlusion might favor the occurrence of phase Ib ventricular arrhythmias. We aimed to investigate whether intracoronary administration of Gd(3+), a stretch-activated channel blocker, into the ischemic zone reduces the incidence of these arrhythmias. In thiopental-anesthetized, open-chest pigs, the left anterior descending coronary artery (LAD) was ligated for 45 or 48 min. Phosphate-free, HEPES-buffered saline bubbled with 100% N(2) was infused into the ischemic region for 4 min, starting 5 min (series A; n = 16) or 20 min (series B; n = 16) after coronary occlusion, at a rate doubling the baseline blood flow. Animals were blindly allocated to receive 40 muM Gd(3+) or only the buffer during the final 2 min of the infusion. There were no differences between groups with respect to hemodynamic variables, plasma K(+) levels, or size of the ischemic region. In neither series was the number of phase Ib premature ventricular beats reduced by Gd(3+) (46 +/- 20 in untreated vs. 91 +/- 37 in Gd(3+)-treated animals in series A and 19 +/- 7 vs. 22 +/- 13, respectively, in series B; both P = not significant). The occurrence of ventricular tachycardia or fibrillation was significantly associated with the magnitude of early ischemic expansion of the LAD region, as measured by ultrasonic crystals, but was also not prevented by Gd(3+). These results argue against a major role of stretch-activated channels inside the area at risk in the genesis of phase Ib ischemic ventricular arrhythmias. IS - 6 JF - Am J Physiol Heart Circ Physiol SN - 0363-6135 AD - Servicio de Cardiología, Hospital Universitari Vall d'Hebron, Pg. Vall d'Hebron 119-129, E-08035 Barcelona, Spain. TI - Intracoronary infusion of Gd3+ into ischemic region does not suppress phase Ib ventricular arrhythmias after coronary occlusion in swine. VL - 290 KW - ib KW - iks KW - ischemia AU - Barrabés, JA AU - Garcia-Dorado, D AU - Agulló, L AU - Rodríguez-Sinovas, A AU - Padilla, F AU - Trobo, L AU - Soler-Soler, J PY - 2006/06// UR - http://dx.doi.org/10.1152/ajpheart.00917.2005 ER -