Background: Acute coronary syndromes (ACS) include ST-segment elevation myocardial infarction (STEMI), non-ST-segment elevation myocardial infarction (NSTEMI), and unstable angina (UA). The leading cause of mortality in Guatemala is acute myocardial infarction (AMI) and there is no established national policy nor current standard of care.Objective: Describe the factors that influence ACS outcome, evaluating the national healthcare system's quality of care based on the Donabedian health model. Methods:The ACS-Gt study is an observational, multicentre, and prospective national registry. A total of 109 ACS adult patients admitted at six hospitals from Guatemala's National Healthcare System were included. These represent six out of the country's eight geographic regions. Data enrolment took place from February 2020 to January 2021. Data was assessed using chi-square test, Student's t-test, or Mann-Whitney U test, whichever applied. A p-value < 0.05 was considered statistically significant.Results: One hundred and nine patients met inclusion criteria (80.7% STEMI, 19.3% NSTEMI/UA). The population was predominantly male, (68%) hypertensive (49.5%), and diabetic (45.9%). Fifty-nine percent of STEMI patients received fibrinolysis (alteplase 65.4%) and none for primary Percutaneous Coronary Intervention (pPCI). Reperfusion success rate was 65%, and none were taken to PCI afterwards in the recommended time period (2-24 hours). Prognostic delays in STEMI were significantly prolonged in Cornejo-Guerra et al.

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The presence of fragmented QRS represents distortion of signal conduction and depolarisation, which is related to myocardial scar or myocardial fibrosis.