Los Angelesl, Mar 28 : The heart’s ability to use oxygen efficiently is a critical indicator of its health, but tests to measure this function have drawbacks that can limit their use. A new Cedars-Sinai Health Sciences University study found that a new MRI system developed at Cedars-Sinai might overcome this challenge.
The findings, published in Science Translational Medicine, could one day improve management of heart failure, in which the heart fails to pump enough blood to meet the body’s need for blood and oxygen. Poor use of oxygen by the heart is an early indicator of heart failure, which affects nearly 7 million people in the U.S.
“Our study shows how MRI could be used to quickly and noninvasively determine heart oxygen use in the clinic,” said Hsin-Jung Yang, PhD, director of Cardiac Imaging Research in the Biomedical Research Imaging Institute and corresponding author of the study. “With further research and development, this advance could unlock new frontiers in early diagnosis, personalized therapy and next-generation treatments for heart failure.”
The current gold standard for measuring heart oxygen use, coronary sinus catheterization, requires threading a thin, flexible tube called a catheter from a patient’s neck or groin into the heart’s main vein. The procedure, which takes 30 to 60 minutes and involves injection of a contrast dye to guide the catheter, is too invasive for routine heart oxygen monitoring.
MRI uses radio waves, a strong magnet and a computer to create detailed images of areas inside the body. Standard MRI can only produce clear images of the heart, which moves with every beat and every breath, if patients hold their breath at points during the exam. And in order to use these images to measure oxygen, doctors have to take multiple MRI scans—a process that takes several minutes—and draw blood at the same time.
“The system we designed addresses the motion of the heart,” Yang said. “Patients do not need to hold their breath, and it can give precise numbers within three minutes.”
The team proved the accuracy of its MRI method by using it to measure heart oxygen use in patients with and without heart failure, and comparing its readings to readings obtained by heart catheterization.
“Noninvasive testing that detects issues in the heart’s use of oxygen can provide an early warning that heart failure is developing,” Yang said. “Now that we have promising cardiometabolic therapies lined up, earlier detection may allow us to take steps to prevent and treat the condition.”
David Underhill, PhD, chair of the Department of Biomedical Sciences, said the study makes a major contribution toward improving healthcare for heart disease, the No. 1 cause of death.
“Along with its potential for saving lives through early intervention for heart failure, this accessible tool could offer new avenues for cardiac research,” Underhill said. “It could allow us to study patients who have risk for, but no symptoms of, heart failure without exposing them to catheterization, contrast or radiation.”
Additional Cedars-Sinai authors include Li-Ting Huang, Chia-Chi Yang, Archana Malagi, Xinqi Li, Ghazal Yoosefian, Xinheng Zhang, Ziyang Long, Xiaoming Bi, Janet Wei, Alan C. Kwan, C. Noel Bairey Merz and Debiao Li.
Other authors include Guan Wang, Henghui Zhang, Ranran Zhang, Hao Ho, Yuheng Huang, Michael D. Nelson, Anthony Christodoulou and Rohan Dharmakumar.
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