Objective To compare patient radiation dose during implantation of the second generation wireless pacemaker(Micra AV)and traditional dual-chamber pacemaker.Methods Data of 74 patients who received pacemaker implantation for bradycardia were retrospectively analyzed.According to the kind of pacemaker,the patients were divided into AV group(n=30)and traditional group(n=44).The perspective time,air kerma(AK),dose area product(DAP),number of movie sequences and total movie frames were compared between groups.Results AK,movie DAP,number of movie sequence and total movie frames in AV group were all higher than those in traditional group(all P＜0.05).No significant difference of the perspective time nor perspective DAP was found between groups(both P＞0.05).Patients'X-ray radiation projection range were essentially the same in both groups,most distributing on the left side of the bodies.Conclusion Compared with implantation of traditional dual-chamber pacemaker,implantation of Micra AV brought patient greater radiation dose from movie acquisition,while radiation dose from fluoroscopy were not significantly different.

Objective: To compare the radiation dose of direct aspiration first-pass thrombectomy (ADAPT) and conventional stent thrombectomy in treatment of acute middle cerebral artery occlusion. Methods: Totally 54 middle cerebral artery occlusion patients were retrospectively analyzed. The patients were divided into ADAPT group (n=29) and stent group (conventional stent removal, n=25) according to interventional treatment method. The intraoperative fluoroscopy time, air kerma (AK), dose area product (DAP), the number of photographic sequences and photographic frames were recorded and compared between 2 groups, and the correlations of the above indicators were analyzed. Results: The fluoroscopy time, AK, DAP, the number of photographic sequences and photographic frames in ADAPT group were all lower than those in stent group (all P<0.05). There were 25 cases (25/29, 86.21%) in ADAPT group and 13 cases (13/25, 52.00%) in stent group AK value <1.0 Gy, and the rate of patients with DAP value <1.0 Gy in ADAPT group was higher than that in stent group (P<0.01). There were 22 cases (22/29, 75.86%) in ADAPT group and 11 cases (11/25, 44.00%) in stent group DAP value <100 Gy•cm2, and the rate of patients with DAP value <100 Gy•cm2 in ADAPT group was higher than that in stent group (P=0.01). The fluoroscopy time was positively correlated with DAP (r=0.60, P<0.01) and AK (r=0.69, P<0.01), so was DAP and AK (r=0.81, P<0.01). Conclusion: The radiation dose of ADAPT technology was lower than conventional stent removal for treatment of acute middle cerebral artery occlusion.