Seventy five years after Lewis documented aberrant intraventricular conduction, this phenomenon continues to intrigue the clinician and investigator alike. Differentiation of ventricular tachycardia and aberration with all its diagnostic and therapeutic implications is often elusive and continues to challenge the clinician and electrocardiographer. Similarly, the basic electrophysiological mech...

The activities of autonomic nervous system can be accessed using information on heart rate modulation mechanism. HRV analysis is a well-known non-invasive tool that gives information on heart rate modulation mechanism. This paper presents a work on HRV analysis to distinguish normal sinus rhythm from atrial fibrillation, supra-ventricular arrhythmia and premature ventricular contraction. Basica...

A patient with myelocytic leukemia who showed electrical alternans of the T-U wave with no change in the QRS complex following chemotherapy is described. Electrocardiogram taken 4 days later showed ventricular quadrigeminy in which the T-U wave of the first sinus beat after the ventricular premature contraction was markedly less prominent compared to the successive two sinus beats which showed ...

A 43-year-old man from a rural area in Brazil presented to his physician with complaints of palpitations and lightheadedness, mainly on exertion. An electrocardiogram (ECG) showed right bundle-branch block (RBBB), left anterior fascicular block (LAFB), and a premature ventricular contraction (PVC) (Figure 1A). Echocardiography revealed a mildly depressed left ventricular (LV) ejection fraction ...

A prototype CAIS (cardiac arrhythmia interpretation syst/em) based on blackboard model is presented. The issue of automatic electrocardiogram analysis is addressed firstly. The idea ofbi-directional interaction is led into CAIS, which makes the system run in a kind ofway rather close to human mode of thinking. The process of PVC (premature ventricular contraction) diagnosis in CAIS is described...