The sound of a siren is sometimes the soundtrack of a neighborhood.
Engine House 10 in the Ville Neighborhood is one of the busiest companies in the country.
"In a 12-hour shift we'll run anywhere between low end nine, high 19 runs," explains Matt Zoia of the St. Louis Fire Dept.
From breathing problems to drug overdoses to gunshots, these paramedics respond every time someone calls 911. But the most stressful calls are the ones involving children.
"A medic much wiser than I once said that calls a pediatric, there's two patients," Zoia said. "The first patient is obviously the child and the second patient is the parents."
And it becomes even more taxing when the emergency involves a child with special needs, like little Carly Jackson.
"She's been in and out of the hospital since she was born," Briana Jones said of her daughter Carly.