reset nodus sinuatrialis
re·set no·dus si·nu·a·tri·a·lis(rē'set nō'dŭs sī'nū-ā'trē-ā'lis),
Reset of the sinoatrial node produced by premature depolarization (usually atrial) when the sum of the duration of the premature cycle and the return cycle is less than twice the spontaneous cycle length. Compare: nonreset nodus sinuatrialis.
Synonym(s): sinus node reset