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Very early blood pressure control confers both benefits and harms in acute stroke

Study indicates the rapid identification of stroke type is key to improving outcomes

Date:
May 16, 2024
Source:
George Institute for Global Health
Summary:
Early identification of stroke type could be key to harnessing the benefits of very early in-ambulance blood pressure lowering treatment in patients with suspected acute stroke, according to new research.
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Early identification of stroke type could be key to harnessing the benefits of very early in-ambulance blood pressure lowering treatment in patients with suspected acute stroke, according to new research.

The findings were presented at the 10th European Stroke Organisation Conference in Basel, Switzerland and simultaneously published in the New England Journal of Medicine.1

Professor Craig Anderson, Director of Global Brain Health at The George Institute for Global Health and lead investigator on the study, said that although more research was needed, the results provided a potential pathway to improving outcomes in patients with the most deadly type of stroke.

"Our study shows clear benefits from administering early blood pressure lowering treatment to patients with intracerebral haemorrhage in the ambulance, although overall there was no difference in outcome from this early intervention for all patients with suspected stroke.

"In fact, in patients with a final diagnosis of ischaemic stroke, it actually worsened their outcome, so the ability to make a reliable diagnosis at this early stage is key to harnessing the benefits of very early blood pressure treatment."

The Intensive ambulance-delivered blood pressure reduction in hyper-acute stroke trial (INTERACT4) was a multicentre, randomised, open-label, blinded-outcome study conducted across dozens of ambulance services in China.

2404 ambulance-assessed patients with suspected acute stroke causing a motor deficit within two hours of onset and elevated systolic blood pressure (≥150mmHg) were randomly assigned to immediate blood pressure-lowering (target 130-140mmHg) or usual blood pressure (BP) management in hospital.

The pre-hospital ambulance-initiated BP reduction group with haemorrhagic stroke had a 30% lower likelihood of a poor functional outcome whereas the group with cerebral ischaemia had an equivalent 30% higher likelihood of a poor functional outcome, when compared to patients with these stroke types who received usual care BP management upon arrival at the hospital.

Overall, the effects of pre-hospital BP reduction had a balanced benefit and harm effect so that there was no overall difference in the functional outcome between those who received the usual care in all the stroke patients. Between-group rates of serious adverse events were similar.

Around 80 percent of strokes worldwide are ischaemic, caused by the loss of blood flow to an area of the brain due to a blockage in a blood vessel, leading to a loss of neurological function.1

Intracerebral haemorrhage (ICH) represents over a quarter of all cases of stroke and occurs when blood leaks out of a blood vessel into the brain tissue. ICH is the most deadly type of stroke, with up to one third of patients dying in 30 days, and it is more common in China where the study was conducted.2

"All treatments for acute stroke are highly time dependent -- brain cells die rapidly when deprived of oxygen. But knowing the best treatment approach to take before being able to identify the type of stroke a patient has experienced, is difficult without brain imaging," Professor Anderson said.

"The results do not support in-ambulance administration of blood pressure lowering treatment in patients with suspected acute stroke -- that is clear.

"But in the last few years, we've seen the introduction of mobile stroke ambulances equipped with a CT scanner and other diagnostic tools that aim to identify cases of ischaemic stroke for early administration of clot-busting treatment.

"But our results do support the case for in-ambulance treatment to be administered to patients with haemorrhagic stroke as well.

"In the meantime, while acute stroke treatment happens in the hospital, quicker diagnosis and swift action as soon as the patient arrives at the emergency department is critical to preserving brain function."

References

  1. GBD 2019 Stroke Collaborators. Global, regional, and national burden of stroke and its risk factors, 1990-2019: a systematic analysis for the Global Burden of Disease Study 2019. The Lancet Neurology 2021;20:795-820
  2. Wu S, et al. Stroke in China: advances and challenges in epidemiology, prevention and management. The Lancet Neurology 2019;18:394-405

Story Source:

Materials provided by George Institute for Global Health. Note: Content may be edited for style and length.


Journal Reference:

  1. Gang Li, Yapeng Lin, Jie Yang, Craig S. Anderson, Chen Chen, Feifeng Liu, Laurent Billot, Qiang Li, Xiaoying Chen, Xiaoqiu Liu, Xinwen Ren, Chunfang Zhang, Ping Xu, Lijun Wu, Feng Wang, Daijun Qiu, Mei Jiang, Yiqian Peng, Chaohui Li, Yiyang Huang, Xiaohui Zhao, Jiye Liang, Yao Wang, Xiangjun Wu, Xiaoyun Xu, Guofang Chen, Dongya Huang, Yue Zhang, Lian Zuo, Guozhao Ma, Yumei Yang, Junjie Hao, Xiahong Xu, Xinli Xiong, Yueyu Tang, Yijia Guo, Jianping Yu, Shuping Li, Song He, Fengkai Mao, Quandan Tan, Song Tan, Nengwei Yu, Ruxiang Xu, Mingwei Sun, Binghu Li, Jiang Guo, Leibo Liu, Hueiming Liu, Menglu Ouyang, Lei Si, Hisatomi Arima, Philip M. Bath, Gary A. Ford, Thompson Robinson, Else Charlotte Sandset, Jeffrey L. Saver, Nikola Sprigg, H. Bart van der Worp, Lili Song. Intensive Ambulance-Delivered Blood-Pressure Reduction in Hyperacute Stroke. New England Journal of Medicine, 2024; DOI: 10.1056/NEJMoa2314741

Cite This Page:

George Institute for Global Health. "Very early blood pressure control confers both benefits and harms in acute stroke." ScienceDaily. ScienceDaily, 16 May 2024. <www.sciencedaily.com/releases/2024/05/240516122553.htm>.
George Institute for Global Health. (2024, May 16). Very early blood pressure control confers both benefits and harms in acute stroke. ScienceDaily. Retrieved June 24, 2024 from www.sciencedaily.com/releases/2024/05/240516122553.htm
George Institute for Global Health. "Very early blood pressure control confers both benefits and harms in acute stroke." ScienceDaily. www.sciencedaily.com/releases/2024/05/240516122553.htm (accessed June 24, 2024).

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