SEE PAGE 774 T he mechanism of ventricular tachycardia (VT) in patients with structural heart disease is primarily scar-related reentry (1). Although any disease process that results in the formation of myocardial scar can predispose to reentrant VT, the best characterized substrate is post-myocardial infarction VT. After myocardial infarction, ventricular tissue can be classified into 3 types:...

OBJECTIVES The objective of this study was to assess the role of Purkinje fibers in monomorphic, post-infarction ventricular tachycardia (VT). BACKGROUND Ventricular fibrillation and polymorphic VT in the setting of acute myocardial infarction (MI) may be triggered by ectopy arising from Purkinje fibers. METHODS From among a group of 81 consecutive patients with post-infarction monomorphic ...

Small, high-frequency electrocardiographic signals were recorded from the body surface in 39 patients with and 27 patients without ventricular tachycardia (VT). All patients were in normal sinus rhythm, had a previous myocardial infarction, were not taking antiarrhythmic drugs, and did not have bundle branch block. Bipolar X, Y, Z leads were signal averaged and processed by a bidirectional digi...

Non-invasive recording of the late potential (LP) by signal-averaging technique is useful in predicting ventricular tachycardia (VT), especially in patients with myocardial infarction (MI). However, the rate of positive LP is LOW in anterior or anteroseptal MI, since the LP is masked by QRS complex. The purpose of the present study is first, to detect local conduction delay in initial portion o...

At its core, the polyvagal theory proposes that peptides affect simple social behaviors through influences on hindbrain autonomic processes. To test this mechanism, we compared the effects of fore- and hindbrain infusions of vasotocin (VT) on social approach behavior in goldfish. VT infusions into the 4th ventricle, which ink infusions verified did not move rostrally to the forebrain, inhibited...

the aim of this study is to evaluate how far lempel-ziv complexity (lzc) of the binary symbolic sequences resulting from static or dynamic transformation (partitioning first-order difference) of the short-term electrocardiogram (ecg) signals (only 2 seconds duration) has the  potential in discriminating normal and ventricular tachycardia/ventricular fibrillation (vt/vf) subjects. the statistica...

OBJECTIVE To determine the outcome of Radiofrequency Catheter Ablation (RFCA) as a non-pharmacological curative therapy for idiopathic Ventricular Tachycardia (VT) and to identify procedure-related complications. STUDY DESIGN Descriptive study. PLACE AND DURATION OF STUDY The Armed Forces Institute of Cardiology and National Institute of Heart Diseases, Rawalpindi, from February 2001 to Oct...

We have measured total vocal-tract (VT) length, lip-tube length and glottal height during vowels on X-ray film data of short French utterances [1]. VT midpoints are determined by progressively fitting circles along the VT-length from the glottis to lip opening. The VT-length is obtained by summing up the distance between adjacent midpoints. Lip-tube length is defined as the distance between the...

BACKGROUND Invasive and non-invasive tests have been used to identify the risk of ventricular tachycardia (VT) in patients with chronic Chagas' heart disease (CCHD). Cardiac magnetic resonance imaging (CMRI) using the delayed enhancement (DE) technique can be useful to select patients with global or segmentary ventricular dysfunction, with high degree of fibrosis and at higher risk for clinical...

Herein we determined the contribution of mechanical ventilation, hyperoxia and inflammation, individually or combined, to the cytokine/chemokine response of the neonatal lung. Eight day old rats were ventilated for 8 hours with low (~3.5 ml.kg-1), moderate (~12.5 ml.kg-1) or high (~25 ml.kg-1) tidal volumes (VT) and the cytokine/ chemokine response was measured. Next, we tested whether low VT v...