Intermittent left bundle branch
block: an overlooked cause of electrocardiographic changes that mimic high-grade stenosis of the left anterior descending coronary artery.
The fQRS on a 12-lead resting ECG was defined by the presence of various RSR' patterns (QRS duration <120 ms) with or without Q wave, which include an additional R wave (R' prime) or notching of the R wave or S wave, or the presence of more than one R prime (fragmentation) (>1 R' or notching of S wave or R wave) without typical bundle branch
block in two contiguous leads corresponding to a major lead set for major coronary artery territory (6) (Fig.
Indications for myocardial perfusion imaging with exercise treadmill testing are a high pretest probability for CAD, an abnormal baseline ECG such as left bundle branch
block, previous myocardial damage or coronary revascularization, or a previous equivocal or unexpected exercise ECG result.
ECG before electrophysiological study: sinus rhythm, 70 bpm, new right bundle branch
block, isolated PVCs with morphology of left bundle branch
block with severe intracardiac conduction
Simultaneous pacing of both ventricles (biventricular or BiV pacing) or of one ventricle in patients with bundle branch
block, benefits some patients with Heart Failure.
Caption: Figure 1: EKG showing borderline AV conduction delay and right bundle branch
block (RBBB) pattern.
In a previous study atrioventricular blocks and bundle branch
blocks in acute myocardial infarction males have an incidence of 62.5% and 65.5% respectively.
(3) The wide QRS complexes (> 0.12 s) with broad S waves in leads I, aVL, and the lateral precordial leads and broad R or R' waves in leads aVR and V1 indicate right bundle branch
Multivariate Cox hazards regression analysis identified New York Heart Association Class (NYHA) III/IV at entry (hazard ratio [HR]: 1.99; 95% confidence interval [CI]: 1.05-3.80; P = 0.036), left bundle branch
block (LBBB) (HR: 2.80; 95% CI: 1.47-5.31; P = 0.002), and an abnormal Q wave (HR: 2.21; 95% CI: 1.16-4.23; P = 0.016) as independent predictors of cardiovascular death, in accordance with all-cause death and heart failure-related death.
ECG showed normal sinus rhythm with left bundle branch
block and wide QRS [Figure 2].
In the current case report, we present a patient who was diagnosed with subarachnoid hemorrhage and had left bundle branch
The ECG recordings of the groups were compared based on the frequencies of the right bundle branch
block, left bundle branch
block, left anterior hemi block (LAH), left posterior hemi block (LPH), first-degree atrioventricular (AV) block, unifascicular block, bifascicular block, trifascicular block, and fragmented QRS.
Electrocardiography (Figure 1) revealed atrial fibrillation, right bundle branch
block and a deep S wave in V6, suggesting right ventricular enlargement (as indicated by the arrow in Figure 1).
The European Society of Cardiology (ESC) Guidelines for the management of acute MI in patients with ST segment elevation  recognized atypical ECG presentations in patients with ongoing symptoms consistent with myocardial ischemia that should be performed in pPCI: bundle branch
block, ventricular paced rhythm, isolated posterior infarction, and ischemia due to left main coronary artery occlusion in the presence of ST depression [greater than or equal to] 1 mm in eight or more surface leads (inferolateral ST depression), coupled with ST segment elevation in augmented vector right (aVR) and/or V1.
Objective: To determine the frequency of intraventricular dyssynchrony among patients with left bundle branch