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Factors Influencing Total X-rays Beaming Duration of Digital Subtraction
Angiography Machine in Percutaneous Coronary Intervention for Chronic
Total Occlusion

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F. Liu, J. Wang, H. Qin, H. Wen, W. Li, L. Liao, and W. Suthakorn 1
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1 International PhD program, Faculty of Nursing, Chiang Mai University, Thailand, Occupational health
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department, Hengyang Traditional Chinese Medicine Hospital, China, School of Nursing, University
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of South China, China, and Interventional Cardiac Imaging Center, The First Affiliated Hospital of
University of South China, China
Background: Clinically, percutaneous coronary intervention for chronic total occlusion (CTO-PCI), based
on radiographic interventional technology, has maximum radiation then other interventional procedures
which can lead to seriously adverse outcome of occupational radiation exposure of nurses. time
minimization is one of the basic principles of occupational radiation protection. However, the factors
influencing X-rays beaming duration in CTO-PCI is not clear based on new CTO consensus.

Objective: This study aims to identify the patient and treatment-related factors influencing total
X-rays beaming duration during CTO-PCI.

Methods: A retrospective study was conducted on 224 CTO-PCI patients admitted to the Cardiac
Intervention Imaging Center of the First Affiliated Hospital of University of South China. According to
the median value of X-ray beaming duration (50.55 min), 112 patients with longer exposure time were
assigned to the longer beaming duration group, while 112 patients with shorter exposure time were
assigned to the shorter beaming duration group. A case-control study was used to analyze the
differential risk factors between two groups, and risk factors with P ≤ 0.2 were included in a binary
logistic regression model to identify factors related to longer beaming duration (> 50.55 min).
Oral Presentation Abstracts
Results: EF <50%, J-CTO score, radial artery puncture only, wire passage through lesion, and number of
guide wires can significantly influence X-rays beaming duration during CTO-PCI (OR: 0.467, 1.471, 2.159,
0.345, and 1.397, respectively; P < 0.05).

Conclusion: Five factors can be used to predict larger X-ray beaming duration (> 50.55 min) during
CTO-PCI, consequently preparing for the model of occupational radiation exposure and occupational
safety among Cath-lab nurses.

Keywords: beam duration, CTO, coronary stenting, occupational exposure, risk factors

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Correspondence: Weeraporn Suthakorn, International PhD program, Faculty of Nursing, Chiang Mai
University, Thailand
E-mail: weeraporn.s@cmu.ac.th

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