[Coronary artery bypass grafting in myocardial infarction and unstable angina pectoris: in-hospital outcomes. Part 2].

Aim: To assess in-hospital outcomes of coronary artery bypass grafting in patients with acute coronary syndrome, depending on the presence or absence of myocardial infarction.

Patients And Methods: Over the period from 2017 to 2018 within the framework of a single-centre register, the study enrolled a total of 166 consecutive patients admitted with non-ST segment elevation acute coronary syndrome and subjected to coronary artery bypass grafting. Depending on the outcome of acute coronary syndrome, the patients were divided into 2 groups: Group One included 98 (59%) patients with unstable angina pectoris and Group Two comprised 68 (41%) patients with myocardial infarction, who underwent surgery at an average of 16 (11; 20) days after manifestation of the clinical signs of myocardial infarction. The endpoints of the study were major adverse cardiovascular events during the in-hospital period: death, myocardial infarction, acute cerebral circulation impairment/transitory ischaemic attack, repeat revascularization, septic complications, multiple organ failure syndrome, wound infectious complications, requirement for repeated surgical debridement, remediastinotomy due to haemorrhage, the frequency of extracorporeal membrane oxygenation and renal replacement therapy.

Results: The mortality rate in the compared groups was similar: 3% (n=3) and 3% (n=2), respectively. Perioperative myocardial infarction occurred in 1 (1%) patient of the first group, with no cases of this complication observed in the second group. The frequency of reoperations due to haemorrhage in the early postoperative period in the group of unstable angina pectoris amounted to 3% (n=3) and was associated with administration of dual antithrombotic therapy, with no cases of this complication in the group of myocardial infarction. Wound complication in the second group were observed in 7.6% (n=5) and in the first group in 4% (n=4) (p=0.33). The differences turned out to be statistically insignificant for such postoperative complications as multiple organ failure syndrome, requirement for repeated surgical debridement, renal replacement therapy, and extracorporeal membrane oxygenation. The residual SYNTAX Score in the group of myocardial infarction amounted to 2.3±2.8, whereas in the group of unstable angina pectoris to 2.3±3, thus suggesting complete revascularization in the total sample of patients with acute coronary syndrome. The average length of hospital stay (including the postoperative period) in the first group amounted to 26.3±6.6 days and in the second group to 27.4±7.2 days (p=0.53). The postoperative bed-day in the group with unstable angina pectoris was 12.6±3.2 and in the myocardial infarction group - 14.9±5.3 (p=0.06).

Conclusion: The obtained in-hospital outcomes suggest that coronary artery bypass grafting may be an efficient and safe method of complete revascularization for patients with non-ST-elevation acute coronary syndrome, including that resulting in myocardial infarction, performed averagely on day 16 (11; 20) after the onset of clinical manifestations of myocardial infarction.