LR35 Captain hears an unusual amount of engine noise after stowing the reverser's during rollout and is informed by a nurse that the emergency exit has fallen open. The right engine is shut down and the aircraft continues to parking.

Narrative

During landing rollout as I stowed the thrust reverser's; I heard an unusual amount of engine noise. One of the nurses called to the pilot not flying to point out that the emergency exit had fallen open. I shut down the right engine and continued to taxi back to parking as there were no other indications of anything affecting safety of passengers or aircraft. During the incident debrief; the nurses indicated that the exit had actually opened while we were airborne and that there was a significant pressure change at that time. I didn't hear or feel anything unusual during the flight or on approach. My first indication that there was a problem was during the landing rollout. Since the occurrence of a similar incident many years ago; it has been my habit to check the security of the emergency exit during my preflight walk around. The only other thing I might add as a result of this is to check the condition of the safety wire that is normally in place to hold the emergency exit window handle in the closed position.