Electrocardiographic signs of acute myocardial infarction in left bundle branch block
. Med Pregl.
Left bundle branch block
(LBBB) is an abnormality of cardiac conduction system which causes delayed activation of left ventricle leading to delayed left ventricular contraction compared to the right ventricle.1 LBBB in children is associated with cardiovascular disease or surgery and is not observed in the general population.
Thus, it was observed that arrhythmias were more common in patients of acute myocardial infarction presenting with bundle branch block
than in patients of acute myocardial infarction without bundle branch block
and was statistically significant (p= 0.05).
Verapamil administration did decrease the severity of ST segment elevation and the induction of a bundle branch block
(6,7) It is also common to find tachycardia, ST and T wave changes, bundle branch block
, extrasystoles and prolongation of QT interval.
These observed irregularities in the cardiac rhythm took various forms 8 ECGs displayed PVCs, 3 had PACs, 2 had atrial fibrillation, 1 had missed beats and 1 had a bundle branch block
. A PVC results from ectopic foci in the ventricles leading to premature depolarization that therefore propagates along an abnormal and often lengthened pathway.
Based on results from randomized clinical trials, the international guidelines for treatment of patients with acute ST-elevation myocardial infarction (STEMI) recommend immediate reperfusion therapy, preferably primary percutaneous coronary intervention (PCI) in patients with chest pain and suspected new-onset left bundle branch block
. (Kushner et al 2009)
Clinical features of unstable angina with left bundle branch block
. In the Proceedings of the IV International Congress "Cardiology at the crossroads of the sciences", Abstracts, Tyumen, pp: 36.
"We gave the greatest strength of recommendation for patients with a wide QRS interval and left bundle branch block
, a modest recommendation for patients with a less wide interval, and an equivocal recommendation for those without left bundle branch block
The syndrome of right bundle branch block
, ST segment elevation in V1 to V3 and sudden death is a clinical-electrocardiographic diagnosis based on syncopal or sudden death episodes in patients with a structurally normal heart with a characteristic electrocardiographic pattern.
Electrocardiography showed a sinus rhythm with a complete right bundle branch block
. Two-dimensional transthoracic echocardiography revealed dilated right heart chambers, a closure device and a defect at the interatrial septum.
any kind of atrioventricular or intraventricular conditions or blocks such as complete left or right bundle branch block
, AV node block, QTc or PR prolongation, premature atrial contractions or other atrial arrhythmia, sustained ventricular arrhythmia, two premature ventricular contractions in a row, ST elevation consistent with ischemia)