The car ferry has docked at the East Cowes terminal and paramedics from the Isle of Wight Ambulance Service have boarded the vessel.
An Ambulance, a rapid response paramedic and Bembridge Coastguard Rescue Team are on scene.
Red Falcon, which left Southampton as the 19:00 sailing, is currently having to stand by off Cowes Parade as it is unable to dock.
UPDATE @ 20:40 – The patient has been transferred into the awaiting ambulance and rushed to St Mary’s Hospital under blue lights, bringing the incident to a close.
Red Osprey is now preparing to depart for Southampton, allowing Red Falcon to dock.
Ventnor Coastguard Rescue Team were also mobilised to the ferry terminal at Dover Road, but were stood down.
UPDATE @ 21:45 – Island Echo has heard from passengers on board the ferry that a male suffered a cardiac arrest.
Coastguard and paramedics stretchered the individual off the boat for onward conveyance to hospital. Although an air ambulance had been requested, it was unavailable.