To study the clinical effect of low-dose digital subtraction angiography (DSA) technique in obese patients with coronary heart disease undergoing percutaneous coronary intervention (PCI) surgery.

From May 2019 to April 2020, 90 obese patients with coronary heart disease (BMI>30 kg/m²) who met the criteria for PCI surgery were selected and randomly divided into DSA low-dose group and conventional-dose group. The two groups of patients underwent PCI operations under different radiation doses, and recorded the image quality, cumulative radiation dose (CD) and dose area product (DAP) under different body positions respectively; cardiac function was measured before and after the operation by echocardiography (LVEF, LVESD, LVEDD) changes; SF-36, SAQ scales were used to evaluate the postoperative quality of life of patients; postoperative serum inflammatory factors (hs-CRP, TNF-α, IL-6) index values were measured.

The images obtained by the DSA low-dose group and the conventional dose group can clearly display the three-level branches of the blood vessels, have good blood vessel edge sharpness, and have no significant difference in image noise, which can meet the clinical diagnosis and treatment requirements. The CD value and DAP value of the DSA low-dose group were significantly lower than those of the conventional dose group (P<0.05), and the SF-36 health questionnaire showed that the low-dose group was better than the conventional dose group (P<0.05). The cardiac function performance and blood inflammatory factor content of the two groups were similar after operation, and there was no statistical difference (P>0.05).

The DSA low-dose group can ensure smooth PCI surgery for obese patients with coronary heart disease within the low radiation dose range that meets the requirements of clinical diagnosis and treatment. The postoperative rehabilitation effect is better, and patients and medical staff receive less radiation, which is worthy of clinical promotion.