Inclusion Criteria: According to the Holter examination results and Lown's grading of premature ventricular contraction
(PVC), only Grade 3 and above patients were selected in this study.
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.
Most people experience the occasional heartbeat which originates from the ventricles, known as a premature ventricular contraction
, or PVC.
Depending on where they happen, these extra or early beats are called premature ventricular contractions
(PVCs) or premature atrial contractions (PACs).
5 Taking into account the variations in ECG, frequent premature ventricular contractions
(PVCs) defined as more than 30 times in any 1 hour during the study or multifocal/polymorphic PVCs were considered abnormal for ventricular complexes.
The electrical storm develops when a vulnerable anatomic substrate (such as a structural heart disease or scarring after an MI) is affected by a triggering event, like premature ventricular contractions
(PVCs), or an electrolyte imbalance--in the absence of some vulnerable substrate, these other events possibly being of little clinical consequence.
The patients were grouped according to the number of premature ventricular contractions
and presence of complex ventricular arhythmia in the 24-hour rhythm Holter monitor test.
The study, published in the Journal of the American Heart Association, found no significant associations between the intake of coffee, tea or chocolate (which contains varying amounts of caffeine) and the hourly rate of premature atrial contractions or premature ventricular contractions