Abstract: Objective To construct a risk prediction model for iatrogenic femoral pseudoaneurysm （IPA） after transcatheter radiofrequency ablation，and to explore the effect of the model. Methods The clinical data of patients with arrhythmia who underwent transcatheter radiofrequency ablation from August 1，2018 to February 28，2023 in the cardiovascular department of a tertiary grade-A hospital in Zhejiang Province were retrospectively collected. 50 patients with postoperative IPA were selected as the case group，while 204 patients without IPA were randomly selected as the control group. Risk factors were analyzed and a nomogram prediction model was constructed. Independent risk factors were determined by multiple Logistic regression analysis（stepwise forward method）. Hosmer-Lemeshow test was used for goodness of fit of the model. Results Logistic regression analysis showed that age（OR =1.061），catheter type≥（OR =9.716），and postoperative international standardized ratio （OR =8.982） were independent risk factors for IPA. Local compression time（OR=0.051），compression dressing time（OR=0.846） and limb immobilization time（OR=0.605） were protective factors. The area under ROC curve of the nomogram model was 0.906（95%CI=0.848~0.964，P<0.001），the sensitivity was 0.860，and the specificity was 0.759. The area under ROC curve of the externally validated model was 0.868（95%CI=0.760~0.976，P<0.001）. Conclusion The iatrogenic femoral pseudoaneurysm nomogram model established in this study has good predictive efficacy，which can provide a basis for clinical staff to formulate hierarchical management strategies and reduce the risk of its occurrence.

Key words: Arrhythmia, Sinus； Radiofrequency Ablation； Aneurysm, False； Prediction Model； Critical Care Nursing