a2v vsp intervals at the faster rates in cases where there are very few vsp paces detection will work with the longer vsp in these cases an algorithm that switched to a vsp like that of fig5 below at high pacing rates would decrease the number of vsp events if multiple vsp events occurred in a specified amount of time the device would switch to the vsp method described in fig4 fig5 illustrates a ventricular safety pacing method having a short trigger zone the ventricular safety pacing method of fig5 includes an a2v vsp timing interval 50 having a length of 110 ms terminating at a vsp pace point 58 where a vsp pace is delivered if a ventricular event is sensed by the device within the trigger zone a blanking interval of 30 ms is indicated at 52 followed by a 40 ms long trigger zone indicated at 54 the blanking interval begins with atrial pacing event 56 as before one method according to the present invention may be briefly described with reference to fig6 if a high rate pacing is not desired at step 60 then the ventricular safety pacing method 61 of fig3 is used if a high rate of pacing is desired at step 60 then it must be determined at step 62 whether n vsp paces have occurred in the last m seconds in other words determine whether a limit number n of paces occurred within.