The study has a questionable ABC Cardio editorial profile and does not present any novelty. However, its publication decision would be useful for cardiologists in their preoperative control activity. Acute renal insufficiency is always discussed, and sometimes people say it is underestimated or overestimated. Many studies support alternative protocols to prevent contrast-induced nephropathy (CIN) caused by iodine contrasts. It is opportune mentioning the safety of ambulatory protocols for vessels and heart exams carried out on the ambulatory “cath-lab.” […]