Special Cases

Left Bundle Branch Block (Case 1)

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Impression:

  • Fixed reduced uptake in septum (arrows) with all likehood functional and secondary to LBBB.

    Comment:
    Mild reduced uptake in septum (7 to 11 o'clock) and no involvement of apex is the typical pattern of LBBB-induced hypoperfusion.
    Increased intramural pressure caused by the abnormal septum contraction reduces the effective perfusion pressure leading to hypoperfusion.
    A similar pattern can be seen in patients paced form RV (functional LBBB).

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    Atlas of Myocardial Perfusion SPECT
    © Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA
    Comments and errors to atlasspect@yahoo.com
    Contributions and case related information through     Fmannting@bics.bwh.harvard.edu

    Please include URL reference with correspondence
    Initiated: Nov 19, 1995. Last updated: April 26, 1999.