A 61 year old man developed acute pulmonary embolism while in hospital. His previous and admission electrocardiograms (ECGs) showed a typical left ***bundle branch block (LBBB) pattern***. Immediately after the onset of acute pulmonary embolism, LBBB disappeared from his body surface ECG with sinus bradycardia, normalisation of QRS duration, prolonged QT interval, and marked T abnormalities to the right precordial leads. Recovery from pulmonary embolism resulted in reappearance of his left bundle branch pattern. Delayed conduction of the previously unaffected right bundle branch resulting in roughly equivalent onset of ventricular activation is the most likely reason. Rate dependent LBBB is also discussed.
http://pmj.bmj.com/cgi/content/abstract/78/923/555

Emergency Medicine Clinics of North America : Intraventricular ...
Although bundle branch blocks are not an independent predictor of mortality, the presence of transient or persistent bundle branch block with acute MI is a ...
http://linkinghub.elsevier.com/retrieve/pii/S073386270500075...

[PDF]
Endocardial Abscesses in Children: Case Report and Review of the ...
File Format: PDF/Adobe Acrobat
The findings of new persistent bundle branch block or com-. plete heart block on an electrocardiograph are considered. highly specific for the presence of a ...
www.journals.uchicago.edu/cgi-bin/resolve?CID990055PDF

Second-degree Mobitz II heart block and third-degree AV block usually require temporary and/or permanent cardiac pacing. Type II second-degree AV block and a wide QRS complex indicate diffuse conduction system disease and constitute an indication for pacing even in the absence of symptoms. Mobitz II with a wide QRS may degenerate into third-degree heart block and is another reason to consider permanent pacing. In the setting of acute anterior myocardial infarction, transcutaneous pacing initially and transvenous pacing subsequently are warranted. With inferior myocardial infarction, the block usually resolves spontaneously within several days, and only a small percentage of patients require temporary or permanent pacing. Patients with ***persistent bundle branch block*** and transient third-degree AV block may benefit from permanent pacing therapy, especially after anterior myocardial infarction. Nonrandomized studies strongly suggest that permanent pacing does improve survival in patients with third-degree AV block, especially if syncope has occurred.
http://www.emedicine.com/med/topic189.htm

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Note added at 1 day30 mins (2007-06-22 20:04:34 GMT)
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Hier noch zusätzliche Info zum Linksschenkelblock:

Linksschenkelblock nach Roche:
vollständige Leitungsunterbrechung im Verlauf des li. Tawara-Schenkels oder seiner Hauptäste, mit verspäteter, vom – rechtzeitig depolarisierten – re. Ventrikel her erfolgender Erregung des li. Ventrikels über intakte Leitungssysteme oder auf myokardialem Wege (s.a. Schenkelblock); im EKG sind das QRS stark linkstypisch u. verbreitert (> 0,12 Sek.), R plump, oft gesplittert, ST-T gegensinnig zu R, S tief, R parasternal häufig fehlend, in V5–6 verspätete Ankunft des neg. Potentials. S.a. Linksverspätung.

Langenscheidt Wörterbuch Medizin deutsch-englisch:
Schenkelblockbild (Kard) = bundle-branch block pattern
Linksschenkelblock (Kard) = left bundle-branch block, LBBB