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  • Bivalirudin safer and...

Bivalirudin safer and more effective than heparin for treating MI patients undergoing PCI: Lancet

Written By : Dr. Kamal Kant Kohli Published On 2022-11-14T09:00:09+05:30  |  Updated On 19 Oct 2023 4:45 PM IST
Bivalirudin safer and more effective than heparin for treating MI patients undergoing PCI: Lancet
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Researchers at Icahn School of Medicine at Mount Sinai have found in a new study that Bivalirudin is a safer and more effective anticoagulant than heparin for treating patients with the most serious type of heart attacks who undergo urgent percutaneous coronary intervention (PCI). Further it can lower the risk of death or major bleeding by 31 percent.

This is the first large-scale clinical trial to compare the two anticoagulants most widely used after PCI, and shows bivalirudin given with a two-to four-hour high-dose infusion significantly reduces death, major bleeding, and thrombosis when compared with heparin.

The results were announced Sunday, November 6, in a Late Breaking Clinical Trial presentation at the American Heart Association's Scientific Sessions (AHA 22) in Chicago, and published in The Lancet. This work could have broad implications, changing the treatment course for hundreds of thousands of patients across the world who experience a major blockage of a heart artery, a condition known as ST-segment elevation myocardial infarction or STEMI. It is the most serious kind of heart attack.

"For the first time, this study identifies the best and safest treatment course for patients undergoing stenting to treat a STEMI heart attack," says co-Principal Investigator Gregg W. Stone, MD, Director of Academic Affairs for the Mount Sinai Health System and Professor of Medicine (Cardiology), and Population Health Science and Policy, at Icahn Mount Sinai. "Compared with heparin, bivalirudin plus a short infusion substantially improved the likelihood of surviving a STEMI and reduced the two most feared complications-major bleeding and stent thrombosis."

In the "BRIGHT-4" trial, patients with STEMI heart attacks underwent "primary PCI"-an emergency stenting procedure to preserve heart muscle function. Patients require anticoagulant therapy during this minimally invasive procedure to successfully open the blocked heart artery and prevent future blood clots from forming and causing another heart attack.

The most common anticoagulant used during primary PCI is heparin. However, its effects can be somewhat unpredictable, leading to higher-than-desirable rates of bleeding and blood clots. Bivalirudin is a newer anticoagulant that has more predictable "blood thinning" effects. Heparin and bivalirudin have been compared in six prior large randomized trials in patients with STEMI, but in those studies, they were administered with varying regimens and background therapies. This new research evaluates the two most widely used regimens of heparin and bivalirudin, which have never been directly compared with each other in an adequately sized trial.

Dr. Stone along with Yaling Han, MD, PhD, of Shenyang Northern Hospital in Shenyang, China led a team of researchers to analyze 6,106 patients enrolled in the study across 87 sites in China between February 2019 and April 2022. All underwent primary PCI for STEMI treatment, nearly all with a procedure that used the radial artery in the wrist to target the blocked heart artery. Patients were randomized to receive the two most widely used regimens of heparin and bivalirudin, which prior studies have shown to be the safest and most effective. One group received heparin alone, administered through an IV. The other group received bivalirudin through an IV, followed by a high-dose IV infusion for two to four hours after the procedure.

Investigators followed patients for 30 days following the procedure, the timeframe in which STEMI patients are at highest risk for adverse events. The primary goal of the study was to compare the occurrence of all-cause mortality or major bleeding. Researchers found that 4.4 percent of patients treated with heparin died or had a major bleed within 30 days, compared to 3.1 percent of patients treated with bivalirudin. Overall, the bivalirudin group had a 31 percent reduction in the rate of death or major bleeding compared with patients in the heparin group-a highly statistically significant reduction.

Then researchers then looked at the specific incidence of death alone and major bleeding alone between the groups. They found that deaths were reduced from 3.9 percent in heparin-treated patients to 3.0 percent in bivalirudin-treated patients. Severe bleeding also was reduced from 0.8 percent in the heparin group to 0.2 percent in the bivalirudin group. Both of these differences were statistically significant.

They also analyzed the rate of stent thrombosis-a complication that happens when the vessel abruptly closes as the result of a blood clot that typically leads to a second heart attack or death. This was also lower in the bivalirudin group at 0.4 percent compared with 1.1 in the heparin group, again a statistically significant reduction.

"These results are dramatic," Dr. Stone said. "The simple decision to use bivalirudin during primary PCI in patients with heart attacks, which is now generic and thus inexpensive, can save hundreds of thousands of lives per year and prevent major bleeding and stent thrombosis compared with heparin."

The BRIGHT-4 trial was an investigator sponsored and organized trial. The trial was funded by the Chinese Society of Cardiology Foundation (CSCF2019A01) with a research grant from Jiangsu Hengrui Pharmaceuticals Co., Ltd.

Reference:

Yi Li, Zhenyang Liang, Lei Qin, Prof Mian Wang, Xianzhao Wang, Huanyi Zhang, Yin Liu, Prof Yan Li, Zhisheng Jia, Prof Limin Liu, Prof Hongyan Zhang, Jun Luo, Songwu Dong, Prof Jincheng Guo, Hengqing Zhu, Shengli Li, Haijun Zheng, Prof Lijun Liu, Prof Yanqing Wu, Prof Yiming Zhong, Miaohan Qiu, Prof Yaling Han, Prof Gregg W Stone, Published:November 06, 2022 DOI:https://doi.org/10.1016/S0140-6736(22)01999-7

The LancetBivalirudinheparinheart attackpercutaneous coronary interventionPCImyocardial infarctionSTEMIanticoagulant therapyblood clots
Source : The Lancet
Dr. Kamal Kant Kohli
Dr. Kamal Kant Kohli

Dr Kamal Kant Kohli-MBBS, DTCD- a chest specialist with more than 30 years of practice and a flair for writing clinical articles, Dr Kamal Kant Kohli joined Medical Dialogues as a Chief Editor of Medical News. Besides writing articles, as an editor, he proofreads and verifies all the medical content published on Medical Dialogues including those coming from journals, studies,medical conferences,guidelines etc. Email: drkohli@medicaldialogues.in. Contact no. 011-43720751

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