A prominent Perth man is in a critical condition after crashing his BMW near Sir Charles Gairdner Hospital.

The crash happened on Hospital Avenue in Nedlands at about 9.40pm on Tuesday.

7 News Perth believes the 56-year-old Perth identity suffered a medical episode on his way to the emergency department.

The BMW crashed into the back of a hospital car, a pole, some bollards and a tree.

Paramedics were called and took the man to SCGH, where he is in a critical but stable condition.