Minimizing liver uptake of cationic ~(99m)Tc radiotracers with ether and crown ether functional groups

• 作者: Young-Seung Kim
• 来源期刊: 世界肝病学杂志：英文版（电子版）
• 学科: 医学
• 关键词: Myocardial PERFUSION imaging CATIONIC 99mTc RADIOTRACERS Single PHOTON emission computed tomography
• 年，卷（期）: 2010,（1）
• 页码范围: 21-31
• 页数: 11页
• 分类号: R541

摘要

Ischemia-related diseases,particularly coronary artery disease(CAD),account for the majority of deaths worldwide.Myocardial ischemia is a serious condition and the delay in reperfusion of ischemic tissues can be life-threatening.This is particular true in the aged population.Rapid and accurate early detection of myocardial ischemia is highly desirable so that various therapeutic regiments can be given before irreversible myocardial damage occurs.Myocardial perfusion imaging with radiotracers is an integral component in evaluations of patients with known or suspected CAD. 99m Tc-Sestamibi and 99m Tc-Tetrofosmin are commercial radiopharmaceuticals currently available for myocardial perfusion imaging.Despite their widespread clinical applications,both 99m Tc-Sestamibi and 99m Tc-Tetrofosmin do not meet the requirements of an ideal perfusion imaging agent,largely due to their high liver uptake.The intense liver uptake makes it difficultto interpret the heart activity in the inferior and left ventricular wall.Photon scattering from the high liver radioactivity accumulation remains a significant challenge for diagnosis of heart diseases.This review will summarize the most recent research efforts to minimize the liver uptake of cationic 99m Tc radiotracers by using ether and crown ether-containing chelators. Fast liver clearance will shorten the duration of imaging protocols(【30 min post-injection) ,and allow for early acquisition of heart images with high quality. Improvement of heart/liver ratio may permit better detection of the presence and extent of coronary artery disease.Identification of such a new radiotracer that allows for the improved noninvasive assessment of myocardial perfusion would be of considerable benefit in treatment of patients with suspected CAD.