Study limitations
CIN
CIN
The present study had some limitations. Firstly, it was a single-center, single-blinded study. Only the patients were aware of the inclusion group because we didn’t use a placebo for patients in the NR group. Nevertheless, the two doctors who performed the coronary intervention and ensured the follow-up were blinded to the patient’s group. This limitation seems not to have impacted the results since the data of the study did not depend on the psychological state of the patient. Secondly, given that the patients were followed for only 72 hours after the procedure to diagnose CIN, we didn’t evaluate the morbidity associated with CIN.