Vestibular signs associated with suspected lightning strike in two horses.

The research investigated vestibular symptoms in two horses suspected of being struck by lightning, finding a minor difference in auditory response but no significant changes in radiographic or endoscopic evaluations.

Introduction and Methodology

• This study focused on two 14-year-old horses that developed right-sided unilateral vestibular symptoms, suggestive of balance and orientation issues, potentially due to a lightning strike.
• Methods involved a series of evaluations which included repeated radiographic and endoscopic scans. These methods were used to identify any noticeable changes in the horses’ physical condition following the event.
• They also conducted a brainstem auditory evoked response (BAER) test to analyze the audio response and brain functioning between the two ears.

Findings and Discussion

• The radiographic and endoscopic evaluations did not result in the identification of any significant changes. This implies that the lightning strike, despite causing vestibular symptoms, did not cause appreciable physical damage that could be detected through these methods.
• The BAER test showed a subtle difference in the interaural latency—the time interval it takes for an audio signal to travel from one ear to the other—of waves I, III, and V in the more severely affected horse. This suggests that there may have been a minor impairment or disruption in auditory processing as a result of the suspected lightning strike.
• Despite the latency difference, the central conduction time—or the time taken for signals to pass along nerve fibers in the central nervous system—remained normal for the more severely affected horse. This indicates that overall neural response and signal transmission remained unaffected.

Conclusions

• This study provides insight into the possible vestibular effects of a lightning strike in horses, showcasing subtle changes in auditory processing despite a lack of significant physical changes.
• However, the exact causal relationship between the symptoms and the lightning strike could not be definitively established, as there might be a number of other potential influences or factors at play. More extensive research in this area would be necessary to accurately ascertain the specific effects of lightning strikes on horses’ health and functioning.