Atrial ectopics in MI patient age 59 years, 2 prior MI's with stent placements 1st in 2000 next in 2004 norma?

pt developd emotional anxiety and few hrs later suffered from rhythmic heart irregularities was rushed to emergency ecg showed p-wave disturbance, irregularly irregular rhythm,heart raate 70- 80 (normal 65-68) diabetic pt since 25 years. doctors diagnosed ectopic atrial beats. whats the significance of it in prior mi patient. and wats the pathophysiology and management? pt happens 2 b my father