Carbon monoxide (CO) is a known, potent poisonous gas that causes hypoxaemia because of its high affinity for haemoglobin. It also induces inflammatory responses that cause tissue injury, particularly to the nervous and cardiovascular systems. Here we present a case of late-onset sick sinus syndrome (SSS) after CO poisoning. Arrhythmia during the acute phase has been recorded in the literature, but to the best of our knowledge, this is the first report of late-onset SSS. Late-onset neuropathy after CO poisoning is well known, and it seems that a similar mechanism develops in cardiac conduction after CO poisoning. This report highlights the importance of follow-up for arrhythmia after CO poisoning.

Key words: sick sinus syndrome, carbon monoxide poisoning, arrhythmia, neurologic injury, cardiac injury

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