Wednesday, 11 May 2016

Cabrera's sign and the diagnosis of old MI in LBBB

In a recent blog we looked at the use of the Sgarbossa criteria in the diagnosis of acute myocardial infarction in the setting of pre-existing left bundle branch block.

In this blog we're going to take a look at another useful diagnostic clue: Cabrera's sign, which can be used in the diagnosis of an old myocardial infarction in LBBB.

Cabrera's sign refers to a notch that occurs within the first 40 msec in the ascending portion of the S wave in lead V3 or V4:

Cabrera's sign (arrowed)

This ECG sign was first described by Cabrera & Friedland in 1953.

Although Cabrera's sign has a high specificity for the diagnosis of an old myocardial infarction in LBBB, it has a poor sensitivity.

More details about the original paper by Cabrera and Friedland can be found here:

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