ELECTROCARDIOGRAPHIC DYNAMICS OF THE ST SEGMENT AND T WAVE IN NON–ST-SEGMENT ELEVATION MYOCARDIAL INFARCTION

Authors:

Abstract:

To assess the characteristics and dynamics of ST-segment and T-wave changes in non–ST-segment elevation myocardial infarction, 200 patients were examined, including 164 men and 36 women; the mean age was 62.21±9.38 years. Based on coronary angiography findings, patients were divided into two groups: Group I included 94 patients with non–ST-segment elevation myocardial infarction and non-obstructive coronary artery lesions (stenosis <50 %); Group II included 106 patients with non–ST-segment elevation myocardial infarction and obstructive coronary artery lesions (stenosis≥50 %). In Group I, predominantly transient electrocardiographic changes were observed. During the acute phase, ST-segment depression in leads V4–V6 was most common (62.8 % of patients), and less frequent in leads II, III, and aVF (21.3 %). In Group II, ST-segment depression was deeper and more persistent; ST depression≥1 mm was recorded in 79.2 % of patients, predominantly in leads V4–V6 and II, III, aVF, which was significantly more frequent than in Group I (p=0.016). No significant intergroup differences were found for isolated T-wave inversion or for the combined ST↓+T pattern. ST-segment normalization on days 5–7 occurred significantly more often in Group I (p<0.001). Progression to transmural myocardial infarction (ST-segment elevation myocardial infarction) was observed only in Group II (p=0.019).

Keywords:

non-ST-segment elevation myocardial infarction electrocardiogram ischemic heart disease obstructive and non-obstructive coronary artery lesions

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Publication:

«World of Medicine and Biology» Vol. 21 No. 94 (2025) , с. 131-134
УДК 616.127-005.8-073.7

DOI:

https://doi.org/10.26724/2079-8334-2025-4-94-131-134