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Objective The aim of this study was to investigate whether the use of low frame rate fluoroscopy at 7.5 frames per second during coronary intervention could reduce radiation exposure in Japanese patients. Methods From December 10, 2014 to March 20, 2015, 84 consecutive patients with coronary artery disease who underwent coronary intervention in our institution were retrospectively collected and then divided into two groups: the LR group (fluoroscopy at 7.5 frames per second) and the OR group (fluoroscopy at 15 frames per second), according to the frame rate of fluoroscopy that was used in their treatment. Results There were no differences in the patient backgrounds or the procedural characteristics of the two groups. Although there were no differences in the contrast volume or fluoroscopy time, the total air kerma at the interventional reference point, which is used to monitor the patient's radiation dose, was significantly lower in the LR group than in the OR group (701.4±427.9 vs. 936.8±623.9 mGy, p=0.02). Conclusion Low frame rate fluoroscopy at 7.5 frames per second is safe and feasible for use during coronary interventions and an easy and useful strategy for reducing the radiation to which patients are exposed during coronary intervention.

The Effect of Low Frame Rate Fluoroscopy on the X-ray Dose during Coronary Intervention