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Cerebral Haemodynamics in Transient Ischaemic Attack

NCT03886129 · Status: TERMINATED · Type: OBSERVATIONAL · Enrollment: 2

Last updated 2021-05-28

No results posted yet for this study

Summary

Adequate brain blood flow is essential for brain survival and function. Brain blood flow is kept relatively constant by a process called cerebral autoregulation (CA). CA is impaired in various diseases including head injury, diabetes, Alzheimer's, pre-eclampsia and stroke. In stroke, impaired CA is associated with poor outcomes. A transient ischaemic attack (TIA) is the same as a stroke, except the symptoms only last for a short amount of time and resolve spontaneously. TIAs are sometimes called mini-strokes and are a major warning sign of strokes. There have been lots of studies of CA in stroke, but very few studies of CA in TIA. Brain blood flow and CA can be studied non-invasively with Transcranial Doppler ultrasound (TCD).

Study aim: To investigate whether CA is impaired in patients with TIA

20 patients with acute TIA (within 7 days), and 20 healthy controls will be recruited from the specialist TIA clinic at University Hospitals of Leicester NHS Trust. Participants will be eligible if they are aged over 18 and can consent to participate. They won't be able to participate if they have severe heart failure, an irregular heartbeat, blocked neck blood vessels, severe breathing problems, or if they are pregnant.

Participants will undergo an assessment of brain blood flow using TCD, during which their heart rate, breathing and blood pressure will also be monitored. During the assessment participants will sit quietly before being asked to stand and then complete a squat-stand manoeuvre in time with a computer sequence. The research visit will take approximately 90 minutes, the assessment itself will take approximately 1 hour and participants only need to attend once.

Conditions

  • Transient Ischemic Attack

Interventions

DIAGNOSTIC_TEST

Transcranial Doppler Ultrasound (TCD)

Participants will undergo an assessment of brain blood flow using TCD, with two small ultrasound probes held in place on the temples with a customised headframe. During the assessment, heart rate, breathing and blood pressure will also be monitored using a 3 lead ECG, nasal capnography and Finometer® respectively. The assessment will comprise three recordings. Firstly, participants will sit quietly for 5 minutes. Next, they will be asked to sit quietly for one minute before standing and remaining standing for 5 minutes. Lastly, they will be asked to stand and then complete a squat-stand manoeuvre in time with a computer sequence. A tilt sensor attached to the thigh will measure the efficiency and angle of the squatting motion. The squat-stand manoeuvre will consist of 15 squats and participants will be informed that they should try and complete all 15 squats if possible.

Sponsors & Collaborators

  • University of Leicester

    lead OTHER

Principal Investigators

  • Thompson G Robinson, MD · University of Leicester

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2019-04-16
Primary Completion
2021-03-31
Completion
2021-03-31

Countries

  • United Kingdom

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT03886129 on ClinicalTrials.gov