Follow CBSDFW.COM: Facebook | Twitter

FORT WORTH (CBS11) – MedStar paramedic and a supervisor, Heath Stone knows on blazing hot days like this, heat-related calls can begin early.

“Even the low to high 90s you start to see a lot of heat exhaustion calls before they lead into the more severe heat stroke related calls,” Stone said.

When Stone responded to a heat-related call Friday, it was different than when temperatures are cooler. He used his lights and siren. Heat exhaustion can quickly turn into a very serious heat stroke.

“We don’t want them to get any kind of effects that may not be reversible as far as loss of motor function, a facial droop or or even more so — death,” he said.

Heath was first on the scene in his supervisor’s SUV. He grabbed his bag and hurried toward a man sitting slumped forward on a curb, legs outstretched in front of him and chin in his chest. The man in his late 30’s was almost motionless.

“Do you have any allergies to medicine?” Heath asked as he began removing medical gear from his bag.

The patient was not responsive.

Heath leaned in close to the man’s ear.

“Are you allergic to any medication?” he asked again.

“No,” the patient softly replied.

Firefighters and other paramedics quickly arrived to help.

“He’s pretty dehydrated,” Heath said as they began attaching an IV bag.

The man’s heart was racing but his blood pressure was low. A bad sign.

The patient was taken to a waiting ambulance with all the signs of having narrowly avoided a stroke — perhaps saved by those precious moments gained navigating traffic with lights and a siren.

(©2016 CBS Local Media, a division of CBS Radio Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)