A 49-year-old man with morbid obesity (6′5′′, 360 lbs), diabetes mellitus, hypercholesterolemia, and a history of systemic arterial hypertension had an aortic valve replacement for severe stenosis (aortic valve area, 0.9 cm2) with exertional dyspnea and left ventricular hypertrophy on echocardiogram. Immediately after operation an electrocardiogram was recorded (Figure 1). The electrocardiogram...

OBJECTIVE Compare in-hospital outcome in patients with ST-elevation myocardial infarction with right versus left bundle branch block. METHODS RENASICA II, a national Mexican registry enrolled 8098 patients with final diagnosis of acute coronary syndrome secondary to ischemic heart disease. In 4555 STEMI patients, 545 had bundle branch block, 318 (58.3%) with right and 225 patients with left (...

Introduction Narrowing of the QRS and overcoming left bundle branch block (LBBB) with His bundle pacing (HBP) has been previously described. We present the first 2 reported cases of left bundle branch (LBB) delay with evidence of a split His electrogram during unipolar mapping from the tip of the His bundle (HB) lead during pacemaker implantation. These findings suggest that the site of LBB del...

or bundle of His. Blockage of both the right and left bundle branches would be tantamount to block at these locations. This is the well-established concept of bilateral bundle-branch block.1-3 It highlights a hazard inherent in catheterization of the ventricle opposite that which is already the site of bundle-branch block. Since the advent of cardiac catheterization, numerous reports have been ...