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Systolic luminal narrowing and morphologic characteristics of myocardial bridging of the mid-left anterior descending coronary artery by dual-source computed tomography

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Abstract

To identify factors that can affect systolic compression of myocardial bridging (MB) of the mid-left anterior descending (LAD) coronary artery with dual-source computed tomography (DSCT). Patients with mid-LAD MB (n = 198) detected by DSCT were studied. MB was classified as incomplete superficial (IS), complete superficial (CS), and deep (D) type. The depth and length of the mid-LAD MB segment in diastole, luminal reduction of the tunneled LAD segment in systole, and degree of systolic left ventricular (LV) wall thickening were all analyzed. Correlation between the depth, length, degree of systolic LV wall thickening, and luminal narrowing in the systolic phase was evaluated. Eighty-one (40.9%) MB were IS, 37 (18.7%) were CS, and 80 (40.4%) were D type. Significant differences in the degree of luminal narrowing in the systolic phase were found among the three MB types (IS, 19.9 ± 10.1%; CS, 26.9 ± 12.1%; D, 36.6 ± 13.8%; P < 0.0001). The luminal narrowing in the systolic phase correlated with the depth (r = 0.56) and percentage of systolic LV wall thickening (r = 0.44), but was not related to length (r = 0.28). In addition to the degree of LV systolic wall thickening and depth of MB, the types of MB also affect luminal narrowing in the systolic phase.

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Abbreviations

CCTA:

Cardiac computed tomography angiography

DSCT:

Dual-source computed tomography

ECG:

Electrocardiography

ICA:

Invasive coronary angiography

LAD:

Left anterior descending

LV:

Left ventricular

MDCT:

Multi-detector computed tomography

MB:

Myocardial bridging

VHD:

Valvular heart disease

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Authors and Affiliations

  1. Department of Radiology, Chungnam National University Hospital, Chungnam National University School of Medicine, Daejeon, Korea

    Song Soo Kim

  2. Department of Radiology, Konkuk University Hospital, Konkuk University School of Medicine, 4-12 Hwayang-dong, Gwangjin-gu, Seoul, 143-729, Korea

    Sung Min Ko

  3. Department of Thoracic Surgery, Konkuk University Hospital, Konkuk University School of Medicine, Seoul, Korea

    Meong Gun Song

  4. Department of Cardiology, Konkuk University Hospital, Konkuk University School of Medicine, Seoul, Korea

    Heung Gon Hwang

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  1. Song Soo Kim
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  2. Sung Min Ko
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  4. Heung Gon Hwang
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Correspondence to Sung Min Ko.

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Kim, S.S., Ko, S.M., Song, M.G. et al. Systolic luminal narrowing and morphologic characteristics of myocardial bridging of the mid-left anterior descending coronary artery by dual-source computed tomography. Int J Cardiovasc Imaging 27 (Suppl 1), 73–83 (2011). https://doi.org/10.1007/s10554-011-9959-2

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  • DOI: https://doi.org/10.1007/s10554-011-9959-2

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