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Challenging neurovascular coupling through complex and variable duration cognitive paradigms: A subcomponent

Kannaphob Ladthavorlaphatt1, Farhaana B S Surti2, Lucy C Beishon3

  • 1Department of Cardiovascular Sciences, College of Life Sciences, Leicester Royal Infirmary, University of Leicester, Level 4, Robert Kilpatrick Clinical Sciences Building, Leicester LE2 7LX, United Kingdom; Medical Diagnostics Unit, Thammasat University Hospital, Thammasat University, Pathumthani, Thailand.

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Summary
This summary is machine-generated.

Cognitive tasks impact cerebral blood velocity (CBv) through arterial blood pressure (BP) and resistance changes, with metabolic factors playing a smaller role. Understanding these neurovascular coupling (NVC) components is key for accurate assessment.

Keywords:
Cerebral blood flowCognitive tasksNeurovascular couplingObjective criteriaSubcomponent analysisTranscranial doppler ultrasonography

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Area of Science:

  • Neuroscience
  • Physiology
  • Medical Imaging

Background:

  • Assessing neurovascular coupling (NVC) using cerebral blood velocity (CBv) response to cognitive tasks is confounded by simultaneous changes in arterial blood pressure (BP) and PaCO2.
  • Existing methods lack specificity, potentially misinterpreting NVC integrity due to these confounding factors.

Purpose of the Study:

  • To investigate the specific contributions of arterial blood pressure (BP), critical closing pressure (CrCP), and resistance area product (RAP) to cerebral blood velocity (CBv) changes during cognitive tasks.
  • To differentiate the neurogenic, metabolic, and myogenic components influencing CBv responses under varying task complexity and duration.

Main Methods:

  • 16 healthy participants underwent continuous recordings of bilateral CBv, end-tidal CO2 (EtCO2), BP, and heart rate (HR) at rest and during cognitive tasks.
  • Tasks included word naming (NW) and serial subtractions (SS) of varying complexity and durations (5, 30, 60s).
  • CBv responses were decomposed into BP (VBP), CrCP (VCrCP), and RAP (VRAP) subcomponents to analyze their relative contributions.

Main Results:

  • A temporal effect was observed in bilateral VBP and VRAP during all tasks, with VBP increasing early and VRAP decreasing later.
  • VCrCP demonstrated variability based on task complexity and duration (p<0.046).
  • VBP and VRAP were the primary contributors to CBv responses, with VCrCP showing a smaller, yet significant, contribution, indicating metabolic sensitivity.

Conclusions:

  • CBv responses to cognitive tasks are mainly driven by neurogenic (VBP) and myogenic (VRAP) mechanisms, with metabolic influences (VCrCP) being less dominant.
  • The findings highlight the importance of disentangling these components for a more precise assessment of NVC.
  • Further research is needed to explore paradigm effects, aging, and cerebrovascular conditions on these NVC components.