Cabrera’s sign is a notched QRS greater than 50 ms on the ascending limb of the S-wave in V3, V4 or V5 in the presence of a LBBB. It suggests acute myocardial infarction.See also: QRS complex
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This ECG is from a very elderly woman who presented with shortness of breath, chest and back pain intermittently for several nights. It was relieved by isosorbide, but when she lost this medication she became worse. She had a background of CAD, ischemic cardiomyopathy and heart failure with an ICD in situ for primary prevention. On arrival she was hypoxic (SpO2 88%) with a good BP and HR 90, but improved on CPAP then BIPAP. This was her initial ECG.