Objective To measure the medical radiation level received by patients during diagnosis and treatment of cardiovascular intervention, and probe into the countermeasures for protection.
Methods A total of 262 cases were divided into 4 groups by the type of cardiovascular interventions they received (Group 1, single coronary angiography; Group 2, coronary angiography + coronary artery pre-expansion and stent implantation; Group 3, pacemaker implantation and replacement; Group 4, electrophysiology examination and radio frequency ablation). Dose-area product (DAP, mGycm2) and air kerma (AK, mGy) were analyzed retrospectively. Effective dose was estimated by Monte-Carlo conversion coefficient from DAP.
Results DAP, AK and effective dose were highest in Group 2, (131941.91& #177;112242.64) mGycm2, (1131.07& #177;635.75) mGy, and (18.47& #177;15.71) mSv, respectively; and were lowest in Group 3, (32045.50& #177;57475.17) mGycm2, (158.98& #177;379.50) mGy, and (4.49& #177;8.05) mSv, respectively. There were significant differences in individual radiation exposure among these four groups. Fluoroscopy time was longest in Group 4, (17.03& #177;3.35) min. Number of radiography frame was most in Group 2 (787.12& #177;316.53) and least in Group 4 (3.55& #177;6.27).
Conclusion There is a great difference in the medical radiation level among patients who receive different cardiovascular interventions. As high doses of radiation are received during interventional diagnosis and treatment, appropriate protective measures are necessary to prevent them from potential risk of ionizing radiation.
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