Apparatus for recording an electrocardiogram including: a portable housing; and an analyzer which acquires, processes and stores electrical signals delivered by electrodes positioned on the housing such that the electrodes may be applied to a patient's thorax, and wherein the housing has a first series of three metallic electrodes positioned for application on the patient's thorax to acquire three precordial signals, a second series of two metallic electrodes positioned on the housing so that the patient's fingers may be applied thereon, to acquire two peripheral signals, and a skin electrode to acquire a third peripheral signal, connected to the housing by a connecting cable.