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Sick sinus syndrome

group of abnormal heart rhythms (arrhythmias) presumably caused by a malfunction of the sinus node, the heart's primary pacemaker

Pronunciation
/sɪk ˈsʌɪnəs ˈsɪndrəʊm/
/sɪk ˈsaɪnəs ˈsɪnˌdroʊm/