102 causes of heart arythmia were treated at Kien An General Hospital - Hai Phong from January 2002 to October 2002. There was no difference between male and female subjects in the prevalence of heart arythmia. Its predominance was at the age group above 51 years old. Sinusal tachyarythmia and atrial fibrillation were prevailed among all types. Rheumatism valvular disease, blood hypertension were the most common condition and primary causes of atrial fibrillation and combines arythmia. Chronical cardio-pulmonary diseases and diverse shocks were the second rank of leading causes. Left branch blockade and ventricle tachyrythmia of patients with IV degree of heart failure were nearly severe prognostic factors. Mortality was very high with ventricle failure.
Arrhythmias, Cardiac/etiology ; Diagnosis ; Epidemiology ; Therapeutics

Humans ; Endoplasmic Reticulum Stress ; Heart Failure ; Arrhythmias, Cardiac/etiology* ; Apoptosis

Arrhythmias, Cardiac ; etiology ; prevention & control ; Cardiac Pacing, Artificial ; adverse effects ; methods ; Humans

Arrhythmias, Cardiac ; etiology ; Birth Weight ; Electrocardiography ; Female ; Humans ; Hypocalcemia ; complications ; Infant, Newborn ; Male

Arrhythmias, Cardiac ; etiology ; therapy ; Gap Junctions ; Stem Cell Transplantation ; adverse effects

Arrhythmias, Cardiac ; etiology ; physiopathology ; Humans ; Myocardial Infarction ; physiopathology ; Sympathetic Nervous System ; physiopathology

An algorithm of detecting the TWA (T-wave alternans) based on the maximum of T waves transformed by FFT (Fast Fourier Transform) is described in the paper. By using the method we can reduce the sampling rate, which means "smaller amount of calculation", and solve the problem "the sampling point of T wave changes with the rate of heart beat". The 128 maximum values of T wave in series normal ST-T complex are used to carry out FFT transforms. The TWA is detected by using the frequency of power spectrum.
Algorithms ; Arrhythmias, Cardiac ; diagnosis ; etiology ; physiopathology ; Electrocardiography ; Fourier Analysis ; Heart Rate ; Humans

OBJECTIVETo evaluate the effects of antiarrhythmic peptide (AAP10) on ventricular arrhythmias in rabbits with healed myocardial infarction (OMI).

METHODSThirty rabbits were randomly divided into three groups (n = 10 each): Sham group, left thoracotomy was performed without coronary ligation; OMI group and OMI + AAP10 group, the circumflex coronaries were ligated. Three months post operation, the electrophysiological and antiarrhythmic effects of AAP10 were assessed in the arterially perfused rabbit left ventricular wedge preparation. Sham and OMI group were perfused with Tyrode's solution and OMI + AAP10 group was perfused with Tyrode's solution + AAP10 (80 nmol/L). Transmembrane action potentials were recorded simultaneously from endocardium and epicardium together with a transmural ECG by use of 2 separate intracellular floating microelectrodes. The stimulus-response-interval (SRI) of the epicardium and the incidence of ventricular tachycardia (VT) were observed. Whole heart and left ventricular weights, the left ventricular thickness at infarct border zone were measured.

RESULTSWhole heart and left ventricular weights as well as the left ventricular thickness at the infarct border zone significantly increased post infarction. VT was induced in 8 out of 10 rabbits in OMI group and in 2 out of 10 rabbits in OMI + AAP10 group (P < 0.05). SRI was also significantly shortened in OMI + AAP10 group compared to OMI group [SRI-1: (20.59 +/- 0.79) ms vs. (28.71 +/- 0.55) ms; SRI-2: (30.42 +/- 0.74) ms vs. (38.67 +/- 0.49) ms, all P < 0.01]. However, the action potential morphology and duration were similar between OMI and OMI + AAP10 groups.

CONCLUSIONThe antiarrhythmic peptide (AAP10) can increase gap junctional intercellular conductance without affecting the action potential morphology and duration and decrease the incidence of inducible ventricular tachycardia.

Animals ; Arrhythmias, Cardiac ; etiology ; prevention & control ; Male ; Myocardial Infarction ; complications ; physiopathology ; Oligopeptides ; pharmacology ; Rabbits ; Random Allocation

We invented an efficiently approach to building whole-heart electrophysiological model with cellular automata style massive parallel computing. In this paper, we introduce the simulation facilities of a model we built and the potential application of such model. The first use is to solve the forward problem of electrocardiogram. Simulating arrhythmia ECG and accurately interpreting the significance of various irregular waveforms will be the key goal. Investigating the dynamic property of cardioelectrical activity at cellular and channel levels is the second application, aiming at revealing the mechanism of the generation and sustentation of arrhythmia. Third, the model can be used to research the impacts of artificial interventions on cardioelectrical activity. Electrical defibrillation and pace-making as well as the use of channel block agents are all cases.
Arrhythmias, Cardiac ; etiology ; physiopathology ; Computer Simulation ; Electrocardiography ; methods ; Electrophysiology ; Heart ; physiology ; Humans ; Models, Cardiovascular

Arrhythmias, Cardiac ; etiology ; Coronary Vessels ; pathology ; Humans ; Male ; Mediastinal Cyst ; pathology ; Young Adult