IJCS | Volume 31, Nº5, September / October 2018

DOI: 10.5935/2359-4802.20180050 513 ORIGINAL ARTICLE International Journal of Cardiovascular Sciences. 2018;31(5)513-519 Mailing Address: Roberto Ramos Barbosa Rua Dr. Jairo de Matos Pereira, 780, apto. 1.001. Postal Code: 29101-310, Praia da Costa, Vila Velha, ES - Brazil. E-mail: roberto.rb@cardiol.br, beto.cardio@yahoo.com.br Acute Myocardial Infarction and Primary Percutaneous Coronary Intervention at Night Time Roberto Ramos Barbosa, Felipe Bortot Cesar, Denis Moulin dos Reis Bayerl, Renato Giestas Serpa, Vinicius Fraga Mauro, Walkimar Ururay Gloria Veloso, Roberto de Almeida Cesar, Pedro Abilio Ribeiro Reseck Instituto de Cardiologia do Espírito Santo, Espírito Santos, ES - Brazil Manuscript received on September 20, 2017, revised manuscript on November 29, 2017, accepted on December 20, 2017. Abstract Background: Primary percutaneous coronary intervention is the preferred treatment in ST-elevation myocardial infarction. At night period, the delay until performing primary percutaneous coronary intervention may be determinant to prognosis worsening. Objective: To analyze the results of primary percutaneous coronary intervention performed at day and night periods. Methods: Cohort study that included patients admitted with ST-elevation myocardial infarction who underwent primary percutaneous coronary intervention fromDecember 2013 until December 2016 in a ST-elevationmyocardial infarction reference hospital of a metropolitan region in Brazil, followed from admission to hospital discharge or death, compared according to time of primary percutaneous coronary intervention (night or day). Statistical analysis comprehended the Chi-square test, the Fisher test, the Student’s t-test and the analysis of variance, with significance level of 5%. Results: 446 patients were submitted to primary percutaneous coronary intervention, 159 (35.6%) at night time and 287 (64.4%) at day time. No differences were found between the two groups concerning clinical baseline characteristics. Door-to-balloon time (101 ± 81 minutes vs. 99 ± 78 minutes; p = 0,59) and onset-to-ballon time (294 ± 158 minutes vs. 278 ± 174 minutes; p = 0,32) did not differ between the groups. The incidence of combined major adverse cardiac events (15.1% vs. 14.3%; p = 0,58) and in-hospital mortality (9.4% vs. 8.0%; p = 0,61) were similar between the groups, as well as length of hospital stay (6.0 ± 4 days vs. 4.9 ± 4 days; p = 0,91). Conclusion: Primary percutaneous coronary intervention at night time showed similar results as the procedure performed at day time, without significant increase of in-hospital adverse events, length of stay or mortality. (Int J Cardiovasc Sci. 2018;31(5)513-519) Keywords: Myocardial Infarction; Percutaneous Coronary Intervention; Cohort Studies; Night Care. Introduction In the treatment of ST-segment elevation myocardial infarction (STEMI), mechanical coronary reperfusion through primary percutaneous coronary intervention (PPCI) has an important position and its efficacy has been demonstrated and proven in large studies. 1-3 In addition to attaining target vessel patency in more than 90% of cases, it is able to increase survival and reduce the rates of reinfarction and cerebrovascular accident (CVA) related to chemical thrombolysis. 3-6 PPCI is a class I indication for treatment of the STEMI within the first 12 hours of evolution, when available in a timely manner and performed in qualified centers. 7-9 Access to PPCI is not always easy to achieve, and its unavailability can lead to severe delays and the ineffective treatment of STEMI, with significantly more severe clinical outcomes. The nocturnal period is particularly complex in this context, and previous studies suggest