Complete left bundle branch block often masks old as well as acute myocardial infarctions. However, a diagnosis of acute myocardial infarction in the presence of complete left bundle branch block can be made when the acute injury current is large enough to modify the secondary repolarization abnormalities of left bundle branch block. Under these circumstances the classical ST-T changes of an ac...

or even complete A-V block. Two cases are reported in which catheter-induced transient high grade Mobitz II A-V block, acute reversible prolongation of infranodal conduction time with probable intra-Hisian conduction delay, and persistent (6 hours duration) complete A-V block occurred in patients with left bundle branch block. The observations made indicate that A-V conduction times and the app...

14. Fisch C, Zipes DP, McHenry PL: Rate dependent aberrancy. Circulation 48: 714, 1973 15. Denes P, Wu D, Dhingra RC, Amat-y-Leon F, Wyndham C, Rosen KM: Electrophysiological observations in patients with rate dependent bundle branch block. Circulation 51: 244, 1975 16. Wu D, Denes P, Dhingra R, Rosen KM: Bundle branch block. Demonstration of the incomplete nature of some "complete" bundle bran...

Critical observation of the onset and course of transient bundle-branch block after acute myocardial ischaemia in 5 patients showed that the block was initially demonstrated both on increasing heart rate (tachycardia-dependent block) and on slowing (bradycardia-dependent block), with normal intraventricular conduction at intermediate heart rates. In some patients normal conduction disappeared w...

A patient with tricuspid atresia and characteristic electrocardiographic features of counterclockwise and superiorly oriented frontal plane QRS loop (left anterior hemiblock) is presented. Operative intervention resulted in a clockwise and inferior rotation of the frontal QRS loop (left posterior hemiblock) without the development of complete left bundle branch block. This observation suggests ...

A cohort of 1,960 white men aged 40 to 56 years without initial apparent heart disease and with 11 years of annual rest electrocardiograms and 20 year mortality data was followed in the Chicago Western Electric Company Study. Incomplete right bundle branch block was found in 134 men (6.8%) at entry. During follow-up, 222 men developed such block, an incidence rate of 13.6%. Left axis deviation ...

Ballstocad(liographic studies were done on 28 subjects with left bundle branch block and on 18 subjects with right bundle branch block. The influence of ventricular as nchronism, and the predominance of left or right ventricular disease, upon the derivation and interpretation of the ballistocar(liograsn, is discussed. The ballistocardiogram was found to be a valuable objective guide in the dete...

or even complete A-V block. Two cases are reported in which catheter-induced transient high grade Mobitz II A-V block, acute reversible prolongation of infranodal conduction time with probable intra-Hisian conduction delay, and persistent (6 hours duration) complete A-V block occurred in patients with left bundle branch block. The observations made indicate that A-V conduction times and the app...

669 September 2015 A the overall pulmonary artery catheter (PAC) use has decreased, it remains a valuable tool in select patients. PAC insertion may result in ventricular or supraventricular dysrhythmias due to contact of the catheter with the cardiac chamber walls. The use of balloon-tipped catheters during insertion serves to increase the catheter tip surface area, thereby mitigating applied ...

Atrioventricular conduction was studied in three patients, each representing a different grade of bilateral bundle-branch block. His bundle activity was recorded by a catheter technic. Two of the three patients had experienced Adams-Stokes attacks. The first patient had right bundle-branch block with left axis deviation at the time of catheterization. Increases in the atrial driving rate result...