Welcome to the Cerebral Autoregulation Research Network (CARnet). We are a community of researchers working on cerebral autoregulation. Our members come from many different countries around the world and benefit from attending our annual conference and participating in joint projects that enable us to answer research questions together. We welcome you to join us if you are also working in this area - instructions can be found under the Join link at the top of the page.

Stephen Payne (CARNet Chair)



The brain, more than any other organ in the body, requires a constant supply of oxygen and nutrients, as well as the removal of waste products. In healthy humans, this blood flow should stay approximately constant when blood pressure varies, and adapt to changes in energy consumption and carbon dioxide and oxygen levels in the blood, pressure inside the skull and other factors. This regulation of blood flow is achieved primarily by arterioles (small arteries) dilating and contracting, under the influence of multiple complex physiological control systems. Impairment of these systems may occur e.g. following stroke, trauma or anaesthesia, in premature babies or the elderly, and has been implicated in the development of subsequent brain injury. The non-invasive measurement of relevant physiological signals (blood flow, intracranial and blood pressure, CO2 levels, cerebral oxygen consumption etc.) is challenging and the subsequent assessment of the control systems even more so. Much also remains unknown about the physiology of blood flow control and the best clinical interventions to optimize patient outcome.

Mission Statement


Cerebral autoregulation refers to the physiological mechanisms that maintain bloodflow at an appropriate level, especially during changes in blood pressure. Due to the important influences of arterial carbon dioxide levels, cerebral metabolic rate, neural activation, activity of the sympathetic nervous system, posture, as well as other physiological variables, 'cerebral autoregulation' is often interpreted as also encompassing the wider field of cerebral blood flow regulation, including areas such as CO2 reactivity, neurovascular coupling and other aspects of cerebral haemodynamics.

Understanding and measuring autoregulation remains a big challenge, and despite great clinical interest and much research effort, benefit to patients has so far been limited.

CARNet therefore aims to bring the multidisciplinary research community working in this area together in order to promote and accelerate high quality research by:

  • Sharing data
  • Sharing methods, including experimental arrangements and data analysis
  • Share results, experiences and ideas

CARNet aims to create an environment of trust, openness and confidentiality in which free discussion of scientific ideas, data and results can flourish.



The Ninth and Tenth International Conferences on Cerebral Haemodynamic Regulation (CARNet meetings)

Date: 27/12/2018

We are pleased to announce the next two CARNet international conferences. The 9th meeting will be held in Leuven, Belgium, in September 2019, and the 10th meeting will be held in Shenzhen, China, in May 2020. Preliminary details can be found at our meeting pages.

Congratulations to CARNet 2018 prize winners

Date: 20/06/2018

  • Best Presentation:
    Caroline Rickards (University of North Texas Health Science Center)
  • Best Poster:
    Erta Beqiri (University of Cambridge)
  • Best Student Presentation:
    Joel Burma (University of British Columbia)
  • Best Student Poster:
    Michelle Favre (Rutgers New Jersey Medical School)

Registration now open CARNet 2018

Date: 23/03/2018

The conference registration information for CARNet 2018 are now out, details can be found at our meeting pages.

Abstract submission details CARNet 2018

Date: 15/02/2018

The abstract submission details for CARNet 2018 are now out details can be found at our meeting pages.

The Eighth International Conference on Cerebral Haemodynamic Regulation (CARNet meeting)

Date: 10/01/2018

We are pleased to announce the next CARNet international conference. This will be held in Oxford, UK on the 18th and 19th June 2018. Preliminary details can be found at our meeting pages.

Book anouncment: Cerebral Autoregulation Control of Blood Flow in the Brain

Date: 01/11/2016

Prof. S.J. Payne has recently released a new book on cerebral autoregulation published by Springer, further details can be found here: