Always a good idea to make a short call with Pan-Pan etc & callsign then....pause.... and wait for an acknowledgement. Appreciate you may be having a bad time up there but you might have caught us in the middle of doing something else and I hate asking emergencies to 'say again'.
That said, last months RT exchange was way too brief!
AC "Mayday C/S engine failure going down"
ATC "Roger S/W is!"