Intermittent left anterior hemiblock. A rare case report.

: The Authors report a rare case of intermittent left anterior hemiblock in a 86-year-old man admitted to Department of Emergency Medicine for progressive impoverishment of intellectual functions and episodes of chest pain. They present this rare case of intermittent left anterior hemiblock where the intermittence was not linked to heart rate variations preceding the beginning of the hemiblock being present on the same ECG two different QRS complexes with no modification in frequency or A-V conduction: this finding suggesting a vascular origin of the disturbance. They also stress the importance of a prompt diagnosis in a Department of Emergency Medicine.