Open AccessFactors Associated with the Increase in Spatial and Frontal QRS-T Angles in Patients with Inferior Myocardial Infarction
Author(s) -
Т А Сахнова,
Е В Блинова,
И. Н. Меркулова,
Р. М. Шахнович,
Н. С. Жукова,
Т. С. Сухинина,
Н. А. Барышева,
I I Staroverov
Publication year - 2020
Publication title -
kardiologiâ
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.159
H-Index - 16
eISSN - 2412-5660
pISSN - 0022-9040
DOI - 10.18087/cardio.2020.11.n1295
Subject(s) - cardiology , ejection fraction , medicine , myocardial infarction , qrs complex , percentile , infarction , heart failure , mathematics , statistics
Aim To identify clinical, echocardiographic, and angiographic factors related with an increase in the frontal QRS-T angle (fQRS-T) and the spatial QRS-T angle (sQRS-T) in patients with inferior myocardial infarction. Material and methods The study included 128 patients aged (median [25 th percentile; 75 th percentile]) 59.5 [51.5; 67.0] years diagnosed with inferior wall acute myocardial infarction. fQRS-T was calculated as a module of difference between the QRS axis and the Т axis in the frontal plane. sQRS-T was calculated by a synthesized vectorcardiogram as a spatial angle between the QRS and Т integral vectors. Results The fQRS-T for the group was 54.0 [18; 80] and sQRS-T was 80.1 [53; 110]. The correlation coefficient for fQRS-T and sQRS-T values was 0.42 (p 80° and sQRS-T >110° compared to their lower values were associated with a higher frequency of history of postinfarction cardiosclerosis (44% and 12 %, respectively; p 80° and 55 [50; 60]% at fQRS-T 110° and 57 [51; 60] % at sQRS-T 110° and 2.6 [1; 4] at sQRS-T <110°; p<0.01). sQRS-T was significantly greater in multivascular damage (87 [68; 121]° than in one- or two-vascular damage (72 [51; 100]°; p<0.05). sQRS-T values were significantly lower with spontaneous reperfusion (66 [29; 79] than without spontaneous reperfusion (77 [55; 115]°; p<0.05). Conclusion In patients after inferior wall acute myocardial infarction, increases in fQRS-T and sQRS-T were associated with more severe damage of coronary vasculature, decreased left ventricular ejection fraction, and more severe course of disease.