The experience with bundle branch block at the USAF School of Aerospace Medicine was reviewed. The clinical and follow-up status was evaluated in 394 subjects with right bundle branch block (RBBB) and 125 subjects with left bundle branch block (LBBB). The majority of subjects were asymptomatic at the time of bundle branch block diagnosis. The subjects were divided into subfroups based on electr...

OBJECTIVES The goals of this study were to compare patterns of mechanical activation in patients with chronic right ventricular (RV) pacing with those with left bundle branch block (LBBB) using 2-dimensional and novel 3-dimensional speckle tracking, and to compare ejection fraction (EF) response and long-term survival after cardiac resynchronization therapy (CRT). BACKGROUND Several randomize...

PURPOSE OF STUDY Left bundle branch (LBBB) is common ECG finding. Common causes of LBBB are coronary artery disease (CAD), hypertension and dilated cardiomyopathy (DCM). Purpose of the study was to find out the etiology and left ventricular function in patients coming to a territory care hospital. MATERIAL AND METHODS All consecutive patients coming to our hospital as indoor or outdoor patien...

BACKGROUND In contrast to patients with left bundle branch block (LBBB), heart failure patients with narrow QRS and nonspecific intraventricular conduction delay (NICD) display a relatively limited response to cardiac resynchronization therapy. We sought to compare left ventricular (LV) activation patterns in heart failure patients with narrow QRS and NICD to patients with LBBB using high-densi...

INTRODUCTION Guidelines derived from patients in clinical trials indicate that emergency department patients with likely myocardial infarction (MI) who have new left bundle-branch block (LBBB) should undergo rapid reperfusion therapy. Whether this pertains to lower risk emergency department patients with LBBB is unclear. METHODS A total of 401 consecutive patients with LBBB undergoing an MI r...

Background—Ventricular activation is often abnormal in patients with dilated cardiomyopathy, but its specific eVects on timing remain undetermined. Objective—To investigate the use of the ratio of the sum of left ventricular ejection and filling times to the total RR interval (Z ratio) to dissociate the eVects of abnormal activation from those of cavity dilatation. Methods—Subjects were 20 norm...

The electrocardiographic features associated with acute myocardial infarction (AMI) are often easily recognised. However, interpretation is made more difficult in the presence of confounding patterns such as a left bundle branch block (LBBB). This may result in missed cases which may otherwise have benefited from acute revascularisation therapy. Though not straightforward, the diagnosis of AMI ...

It has previously been reported that the length of the left main coronary artery is short in patients with left bundle branch block (LBBB) and that an unexpectedly large number of LBBB patients had dominant left coronary arterial distribution. The present coronary arteriographic study of 13 patients with LBBB revealed a mean length of the left main coronary artery (+ 1 SD) of 10.9 + 6.0 mm, a m...

Many investigators have dealt with the aspects of this problem. Both historical and contemporary registries and randomized clinical trials (RCTs) help us to understand the clinical relevance of BBB in the presence of an acute MI. The prevalence of BBB on arrival in patients with MI varies between 1.6 and 10.9%, without marked difference between RBBB and LBBB. The true incidence of BBBs of new o...

The controversy about the sex distribution in Left Bundie Branch Block (LBBB) led us to study what occurred in 56 hospitalized patient~s affected by LBBB and ischemic heart disease (IHD). In the group of acute myocardial infarction (AMI), 26 patients, with a high incidence of pump faiture (73%) an a mortality of 33%, the male/female (M/F) ratio was clearly reduced in relation to the global AMI ...