The safety of magnetic resonance imaging (MRI) scans in patients undergoing dual-chamber pacemaker (Medtronic's EnRhythm MRI SureScan IPG (implantable pulse generator) and CapSureFix MRI pacing electrodes) implantation were evaluated. A total of 86 patients undergoing this pacemaker implantation who were admitted to Huanggang Hospital from June 2006 to March 2017 were continuously selected. On average 6.8±2.3 months after the implantation, the first MRI scan was conducted. The mean scan time was 2.2±0.9 and mean duration was 45.6±12.3 min; mean follow-up visit period was 40.5±15.6 months, and after follow-up, all the abnormal symptoms of patients and pacemaker abnormalities after scans were recorded. Causes of receiving MRI scans included neurological diseases (27%), spinal diseases (14%), cancers (26%), joint injuries (25%) and visceral systems (8%). A total of 12 cases (14.0%) showed significant discomfort symptoms, 10 cases (11.6%) showed pacemaker abnormalities, and the incidence rate was 25.6%. Multivariate logistic regression analysis showed that the basic types of cardiovascular diseases, dependence on pacemakers, duration of education, pacing threshold, impedance and MRI scan time were related to the occurrence of adverse scan results (p<0.05). In conclusion, MRI scans show that MRI-compatible dual-chamber pacemaker was relatively safe.
Background: To explore the diagnostic and therapeutic effects of multi-dimensional conformal radiotherapy (MD-CRT) combined with functional imaging in tumor bioimaging.Methods: A total of 150 cases of patients with brain metastases in First Affiliated Hospital of Xi'an Jiaotong University between December 2020 and December 2021 were retrospectively selected as the research cohort. Participants underwent whole brain imaging guided by MD-CRT combined with volume assessment to assess the patient's recent treatment effect, statistically acceptable dose irradiation treatment, and the incidence of adverse reactions. All patients were followed up to evaluate the long-term efficacy.Results: Among the 150 patients, 24 cases were in complete remission, 72 cases were in partial remission, 36 cases were in a stable condition, 18 cases were in deterioration, and the treatment of 96 cases (64.00%) was deemed effective. All participants were followed up, the mean survival was (62.37±1.24) months, 96 cases (64.00%) survived, and 54 cases (36.00%) had died. The average dose was (62.09±3.94) Gy. In terms of adverse reactions: brain edema occurred in 57 patients, accounting for 38.00%. Conclusions:The MD-CRT and functional imaging techniques for patients with metastatic tumor have high therapeutic accuracy, are associated with improved local control rate, prolonged survival, and cause little damage to normal tissues, with significant therapeutic effect, and can be widely used in clinical practice.
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