Which symptom might suggest syncope is due to an arrhythmia?

Repeated episodes of unexplained syncope can suggest that an underlying arrhythmia is present. This is because arrhythmias can cause intermittent disruptions in the heart's rhythm, which may lead to episodes of syncope as the brain temporarily does not receive adequate blood flow. When an individual experiences unexplained syncope multiple times, it raises suspicion for a cardiogenic cause, such as an arrhythmia, particularly if there are no other identifiable triggers.

In contrast, other contexts, such as syncope following eating, may be linked to different physiological responses like postprandial hypotension, which is less likely related to arrhythmias. Syncope accompanying physical exertion may suggest other cardiac issues or responses, and recovery that is immediate after syncope can indicate a non-cardiac cause, such as vasovagal syncope. Therefore, the occurrence of multiple unexplained syncopal episodes is a significant indicator that warrants investigation for potential arrhythmias.