In the present study, patients with ventricular arrhythmias who were found to have a high risk for hospital cardiac event (ranging from post-MI angina to severe cardiac failure) were those with frequent premature ventricular contraction
and/or ventricular tachycardia, with an event rate of 77% compared to 10% in those without such arrhythmias, and this difference was significant at p=0.0002.
After extracting the features for the ECG signal from the premature ventricular contraction
classification, a method of classifying the normal waveform and the early contraction waveform by using the error back-propagation algorithm was studied.
Five types of heartbeats, namely, normal, premature ventricular contractions
(PVC), atrial premature contractions (APC), left bundle branch block (LBBB), and right bundle branch block (RBBB) were recognized in .
 applied the bispectrum computation in each beat and PCA to create the features that ultimately fed NN and support vector machines (SVMs) algorithms to classify between five types of heartbeats including the normal heartbeats (NBs) and premature ventricular contraction
Cao, "Evaluation of the traditional chinese medicine shensongyangxin capsule on treating premature ventricular contractions
: a randomized, double-blind, controlled multicenter trial," Chinese Medical Journal, vol.
The AAMI convention is used to combine the beats into five classes of interest : normal beat, left bundle branch block (LBBB), right bundle branch block (RBBB), and atrial escape and nodal junction escape beats belong to class N category; class V contains premature ventricular contraction
(PVC) and ventricular escape beats, class S contains atrial premature (AP), aberrated premature (aAP), nodal junction premature (NP), and supraventricular premature (SP) beats, class F contains only fusion of ventricular and normal (f VN) beats, and class Q which is known as unknown beat contains paced beat (P), fusion of paced and normal (fPN) beats, and unclassified beats.
Premature ventricular contraction
with right bundle branch block pattern can originates from mitral annulus.
The incidence of arrhythmias was evaluated in accordance with the Criteria of arrhythmia (Curtis and Walker 1988) as follows: 0 = no arrhythmia; 1 = <10 s premature ventricular contraction
(PVC) and/or ventricular tachycardia (VT); 2 = 11-30 s PVC and/or VT; 3 = 31-90 s PVC and/or VT; 4 = 91-180 s PVC and/or VT, or reversible ventricular fibrillation (VF) of <10 s; 5 = >180 s PVC and/or VT, >10 s reversible VF, 6 = irreversible VF.
Most people experience the occasional heartbeat which originates from the ventricles, known as a premature ventricular contraction
, or PVC.
AV- atrioventricular, LQT- long QT syndrome, LVH- left ventricular hypertrophy, NS- non significant, VA- ventricular arrhythmia (premature ventricular contraction
, couplet, ventricular tachycardia and ventricular fibrillation)
Electrocardiogram (ECG) at the time of presentation showed multiple premature ventricular contractions
In addition to patients with AFib and SVT, I see patients with arrhythmias coming from the ventricles (the lower chambers of the heart) such as premature ventricular contractions
(PVCs) or ventricular tachycardia.