Objectives: To ascertain the effect of age on outcomes after culprit-only and complete revascularization after Primary PCI (PPCI) for ST-elevation myocardial infarction (STEMI).
Background: The numbers of older patients being treated with PPCI are increasing. The optimal management of nonculprit stenoses in such patients is unclear.
Methods: We conducted an analysis of patients aged ≥75 years randomized in the DANAMI-3-PRIMULTI study to either culprit-only or complete FFR-guided revascularization. The primary endpoint was a composite of all-cause mortality, nonfatal reinfarction, and ischaemia-driven revascularization of lesions in noninfarct-related arteries after a median of 27 months of follow-up.
Results: One hundred and ten of six hundred and twenty seven patients in the DANAMI-3-PRIMULTI trial were aged ≥75 years. These patients were more likely female (p < .001), hypertensive (p < .001), had lower hemoglobin levels (p < .001), and higher serum creatinine levels (p < .001) than the younger patients in the trial. Other than less use of drug-eluting stents (96.6 versus 88.0%: p = .02), there were no significant differences in procedural technique and success between patients aged <75 years and those ≥75 years of age. There was no significant difference in the incidence of the primary endpoint in patients ≥75 years randomized to culprit-only or FFR-guided complete revascularization (HR 1.49 [95% CI 0.57-4.65]; log-rank p = .19; p for interaction versus patients <75 years <.001). There was a significant interaction between age as a continuous variable, treatment assignment, and the primary outcome (p < .001); beyond the age of about 75 years, there may be no prognostic advantage to complete revascularization.
Conclusions: In patients ≥75 years, after treatment of the culprit lesion in STEMI, there is no significant prognostic benefit to prophylactic complete revascularization of nonculprit stenoses. Pending further study, data would support a symptom-guided approach to further invasive treatment.
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