Abstract: Some epileptic patients may have potentially fatal cardiac rhythm disorders during seizures, and inversely, some cardiac arrhythmias may induce seizures. We present the case of a 71-year-old man diagnosed with primary generalized epilepsy who had a permanent pacemaker because of a trifascicular block. He developed generalized seizures coinciding with intermittent dysfunction of the cardiac device, which we observed while performing an electrocardiogram (ECG). Clinicians should keep in mind that, although it is uncommon, a pacemaker dysfunction may be the cause of seizures. In these patients, a normal ECG may not be enough to rule out this dysfunction, and if there is a high clinical suspicion, a standard pacemaker revision should be performed. © 2009 Elsevier España, S.L. y SEMERGEN.

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