The city is testing out a new ambulance for stroke victims.
The FDNY unveiled its "Mobile Stroke Unit" at New York-Presbyterian Hospital.
It will be staffed by a neurologist and paramedics to diagnose and treat stroke victims.
CT scans will also be on board to monitor patients' brains.
Officials say it can save lives in just minutes.
"If you're having symptoms of a stroke and you call 911 or you think you're having symptoms of a stroke, call 911 and you're triaged to this ambulance," said Steven Corwin CEO, New York-Presbyterian Hospital. "We can treat you right then and there. We can do a CT scan and treat you with a clot-buster, shaving minutes off the time it would take to treat. Which could be live saving."
"The quicker you address the clot, the quicker you get reperfusion of the brain, the better the outcome for the patient," said FDNY Chief of EMS James Booth.
The hospital says the Mobile Stroke Unit is the first of its kind on the East Coast, and just the sixth in the country.