Prevalence of Non-ST-Segment Elevation Myocardial Infarction in Acute Coronary Syndrome With Unremarkable Electrocardiogram: A Cross-Sectional Study From Lady Reading Hospital, Medical Teaching Institute, Peshawar.

Introduction Patients admitted to the cardiac care unit with non-ST-segment elevation myocardial infarction frequently have inconclusive electrocardiogram results. In individuals presenting with sudden central chest discomfort, non-ST-segment elevation myocardial infarction should be suspected until confirmed or ruled out by a cardiac biomarker analysis. This study aims to determine the prevalence of non-ST-elevation myocardial infarction among acute coronary syndrome patients who present with normal electrocardiogram findings. Materials and methods This study was conducted from October 24, 2022, to April 24, 2023, and involved 120 patients who came to the cardiac emergency department at Lady Reading Hospital, Peshawar. These patients experienced chest pain and symptoms of acute coronary syndrome, all within 24 hours of the onset of their symptoms. Demographic data and clinical histories were recorded for each patient. Electrocardiograms were performed, and non-ST-segment elevation was observed. The diagnosis of non-ST-segment elevation myocardial infarction was confirmed by measuring cardiac troponin T levels. A threshold value greater than 0.5 ng/mL was considered diagnostic. Data analysis was performed using the Statistical Package for the Social Sciences (SPSS) (IBM SPSS Statistics for Windows, Version 23, Armonk, NY), and grammar was checked using the Grammarly software (Grammarly, Inc., San Francisco, CA). Results The study participants had an average age of 53.96 years, with a standard deviation of 8.57. Most participants were male, comprising 65.83% of the total population, while 34.17% were female. Among the participants, 26.66% were diagnosed with non-ST-segment elevation myocardial infarction, affecting 32 individuals. The results showed a significant correlation between the occurrence of non-ST-segment elevation myocardial infarction and male gender, as well as with individuals who had pre-existing comorbidities. The p-values for these associations were 0.032 and 0.043, respectively, indicating statistically significant relationships. Conclusion In conclusion, a significant proportion of patients who presented to the emergency department with acute coronary syndrome symptoms and a normal electrocardiogram were diagnosed with non-ST-segment elevation myocardial infarction. This highlights the need for special attention to male patients and those with comorbidities.