If the worst happens, and you or someone you're with is struck by lightning, the first concern is sudden cardiac arrest.
"Lightning can immediately stop your heart," Walsh said. "CPR needs to be started right away." If you happen to be where there's a portable automated external defibrillator, Jensenius said, use it if the person's heart has stopped.
"If someone is moving around, or if you know they have a heartbeat, take care of others who don't," Walsh advised.
Other problems that could occur from a lightning strike are fractures, ruptured ear drums and concussions, according to Walsh. "People don't always come back to where they were before the lightning strike," she said. "Some people have problems that last the rest of their lives. They may have trouble sleeping or headaches."
Jensenius added that some people experience burns, and others have trouble concentrating, are more forgetful, get easily distracted or have personality changes after being hit by lightning. Treatment, he said, depends on the particular injury, though it begins with getting immediate medical help for anyone who's been struck.
And, before that, it starts with a plan.
The National Oceanic and Atmospheric Administration has more about lightning safety.
A companion article details the experience of a lightning strike survivor.
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