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Tinnitus is recognized as a potential side effect of antiarrhythmic medications such as Lidocaine. This condition is characterized by ringing or buzzing sounds in the ears, which can occur due to the drug's effects on the central nervous system. Lidocaine, while primarily used for its anesthetic and antiarrhythmic properties, can impact neurological pathways, potentially leading to auditory disturbances.

Understanding the mechanism by which Lidocaine acts helps clarify this side effect. Lidocaine blocks sodium channels in cardiac cells, and while it is effective in managing arrhythmias, it can also influence sensory pathways, possibly resulting in symptoms like tinnitus. Monitoring patients for such side effects is important, especially in a clinical setting, where alterations in auditory perception can affect a patient's quality of life and signal the need for a reassessment of their medication regimen.

In relation to the other options, while chest pain, severe bradycardia, and fluid overload may be associated with other medical conditions or different medications, they are not commonly recognized side effects of Lidocaine specifically. Thus, tinnitus stands out as the correct association with this particular antiarrhythmic agent.