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  • Title: Laughter-induced left bundle branch block.
    Author: Chow GV, Desai D, Spragg DD, Zakaria S.
    Journal: J Cardiovasc Electrophysiol; 2012 Oct; 23(10):1136-8. PubMed ID: 22494022.
    Abstract:
    We present the case of a patient with ischemic heart disease and intermittent left bundle branch block, reproducibly induced by laughter. Following treatment of ischemia with successful deployment of a drug-eluting stent, no further episodes of inducible LBBB were seen. Transient ischemia, exacerbated by elevated intrathoracic pressure during laughter, may have contributed to onset of this phenomenon.
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