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Address for reprint requests and other correspondence: Martins, Dept. Received Jan 23; Accepted Sep Abstract Ischemic focal ventricular tachycardia VT Acorp VT-26 in animals and humans.

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Angiotensin-converting Acorp VT-26 inhibitors and receptor blockers reduce sudden death in patients with ischemic heart disease. Focal endocardium excised from ischemic sites was studied in vitro with standard microelectrode.


In contrast, of 11 dogs given losartan, reinduction of either mechanism Acorp VT-26 not blocked. Also, triggered activity was promoted by AGII, losartan, or the combination in 9 of 12 tissues.

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PD, but not losartan, preferentially blocked focal VT, which is likely due to triggered activity due to delayed afterdepolarizations Acorp VT-26 Purkinje. Understanding the mechanisms of ventricular tachycardia VT and ventricular fibrillation VF in the early hours after acute myocardial injury is hampered by the rapidly changing substrate, which is difficult to investigate clinically. Limited reports have implicated focal endocardial 67as well as reentrant mechanisms contributing to VT in humans with coronary artery disease and acute myocardial infarction. Mechanisms demonstrated in animal models may be useful to gain insight into new therapies to prevent VT in patients.

Animal experiments have shown significant contribution of the Purkinje system in the genesis of ischemic focal VT 1. Triggered activity TA due to delayed afterdepolarizations DADs appears to Acorp VT-26 a predominant mechanism underlying these arrhythmias Previous studies have demonstrated that focal ischemic VT can be modulated by upstream therapies, such as adrenergic blockers 2statins 27and free radical scavengers The renin-angiotensin system is activated during myocardial ischemia and injury 1720 — Angiotensin II AGII may have direct electrophysiological effects 1328 and could act as an endogenous arrhythmogenic agent, with mechanisms involving enhanced free radical formation, as well as release of sarcoplasmic calcium in cardiac myocytes via activation of a phosphatidylinositol response.

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Angiotensin-converting enzyme inhibitors and AGII receptor AT blockers reduce sudden cardiac death in patients with coronary artery disease and left ventricular dysfunction 11 Furthermore, angiotensin-converting enzyme inhibitors have been shown to reduce spontaneous ventricular arrhythmias in patients with congestive heart failure The exact role of AT2 receptor is Acorp VT-26 an open question 9. AT2 receptor blockade has been shown to be protective against ischemia-reperfusion injury-mediated VT in rats The purpose of this study Acorp VT-26 to investigate the effects of AGII, AT1 receptor blocker losartan, and the selective, nonpeptide AT2 receptor blocker PD PD in modulation of mechanisms of VT induced during 1—3 h of acute myocardial ischemia in a well-studied dog model showing both focal and reentrant mechanisms.

Surgical preparation.

The animals were Acorp VT-26 and ventilated using a volume-cycled respirator Harvard to maintain a Po2 of 80— Torr and a Pco2 of 35—45 Torr. The femoral vein and artery were cannulated using a cut-down technique, allowing continuous measurement of arterial blood pressure and for administration of fluid and drugs.

Sodium Acorp VT-26 was infused as necessary to maintain arterial pH in the 7. A suture was passed under the left anterior descending coronary artery just distal to the first diagonal branch and was threaded in tubing, creating a snare for coronary artery occlusion CAO.

Warm saline was applied to the heart intermittently to prevent surface drying. Electrophysiological preparation. Surface electrocardiographic leads II and V5R were recorded continuously. The sinus node was clamped to control the Acorp VT-26 rate. The atria were stimulated at ms cycle length Acorp VT-26 a bipolar electrode.

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Constant current output was set at twice diastolic threshold, with a pulse width of 2 ms. As previously reported, twenty-three pole plunge-needle electrodes J.

Kassell, Fayetteville, NC inserted into the myocardium in and surrounding the risk zone of left anterior descending coronary artery recorded transmural signals Bipolar electrograms were recorded from up to six different sites on each pole electrode 1. Noise-free bipolar signals were chosen by sequential recording on a storage oscilloscope of each successive bipole, to maximize the capability of recording from Purkinje fibers. Purkinje, endocardial, midwall, and epicardial electrograms were chosen, as previously described Electrograms were recorded simultaneously on two computers: Data from both acquisition systems were incorporated, and three-dimensional 3D activation maps were constructed, as previously described 126Download Acorp VT driver for Video card software Acorp VT-26.

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