Kaylah Bennett-Martincevic suffered a cardiac arrest in the car and again on the way to hospital.

Kaylah Bennett-Martincevic, 21, from Cooloola Cove, remains in hospital in a critical condition after suffering a cardiac arrest following the incident on Tuesday.

She had been travelling with a man and two young children when another man produced a knife and started to damage their car, police allege.

Kaylah Bennett-Martincevic.Source:Supplied

.Source:Supplied

A Rainbow Beach man, Graham Michael Hughes, 22, has been charged with threatening violence and wilful damage and will appear in the Gympie Magistrates Court for a bail hearing tomorrow..

Police will allege the two men involved are known to each other.

Earlier, a woman has been left in a critical condition after an alleged road rage attack.

7 News reports the woman, 21, was allegedly tailgated by a man at Rainbow Beach, east of Gympie, about 11.30am, before she slowed down as she headed into a roundabout.

At that point, the man allegedly tailgating the woman pulled out a knife and started stabbing the car.

After the man drove off the woman went into cardiac arrest.

The passenger of the car then called emergency services to revive her but en route to the RBWH the woman suffered another heart attack.

Kaylah Bennett-Martincevic suffered a cardiac arrest in the car and again on the way to hospital.Source:Supplied

The woman remains in a critical condition.

The man has been arrested and is currently assisting police with inquiries.