Source of Support: None, Conflict of Interest: None
Blocked cardiac vessels pose a major clinical problem in modern world. Dilating blocked vessels by balloon angioplasty results in restenosis, mainly due to the excessive tissue repair. Use of radiation after angioplasty may help in arresting or preventing restenosis. Novoste BetaCath device uses 90Sr beta source train to deliver radiation dose to the injury site. A series of tests have to be carried out when a new device is received in the department and also just before and immediately after each treatment. The dose delivered at the prescription point depends upon the vessel diameter and the presence or absence of a stent. 57 patients were treated at the Royal Prince Alfred Hospital (RPAH) between July 1999 and November 2002. Of these, 14 (25%) patients had reference vessel diameter (RVD) between 2.7 and 3.3 mm, while 43 (75%) had RVD between 3.3 and 4 mm. The follow-up results for all of these patients have been very good. Only one radiation incident has been experienced at RPAH with no noticeable radiation exposure to the staff involved.