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Peripheral Arterial Disease II: Clinical Manifestations and Diagnostic Evaluation01:21

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Clinical manifestationsPeripheral Arterial Disease (PAD) manifests through a range of symptoms, from the characteristic intermittent claudication to atypical presentations and severe complications in advanced stages. Intermittent claudication, a hallmark symptom of PAD, presents as exercise-induced muscle pain that typically resolves within minutes of rest. This pain is reproducible and stems from inadequate blood flow, leading to the accumulation of lactic acid produced during anaerobic...
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Related Experiment Video

Updated: Mar 8, 2026

Identification of Disease-related Spatial Covariance Patterns using Neuroimaging Data
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Detection of Impaired Sympathetic Cerebrovascular Control Using Functional Biomarkers Based on Principal Dynamic Mode

Saqib Saleem1, Yu-Chieh Tzeng2, W Bastiaan Kleijn3

  • 1Department of Electrical Engineering, COMSATS Institute of Information Technology Sahiwal, Pakistan.

Frontiers in Physiology
|January 26, 2017
PubMed
Summary

Models analyzing nonlinear cerebral blood flow dynamics can detect sympathetic blockade effects. Very low frequency blood pressure dynamics may serve as biomarkers for neurovascular dysfunction.

Keywords:
biomarkersblood flowblood pressurekernelsprincipal dynamic modes

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Area of Science:

  • Neuroscience
  • Cardiovascular Physiology
  • Biomedical Engineering

Background:

  • Cerebral blood flow (CBF) regulation involves complex nonlinear dynamics.
  • Sympathetic nervous system blockade can impact cerebrovascular function.
  • Existing models may not fully capture these nonlinearities.

Purpose of the Study:

  • To evaluate Laguerre-Volterra kernel models for detecting sympathetic blockade effects on CBF dynamics.
  • To identify potential biomarkers of sympathetic neurovascular dysfunction.

Main Methods:

  • Retrospective analysis of blood pressure, middle cerebral blood velocity, and PETCO2 recordings.
  • Application of Laguerre-Volterra kernels to analyze nonlinear system dynamics and global principal dynamic modes (PDMs).
  • Comparison between placebo and Prazosin (α1-adrenergic receptor blocker) treatment groups.

Main Results:

  • Very low frequency (<0.03 Hz) linear components of BP and PETCO2 kernels were coupled to CBF dynamics, distinguishing between control and blockade conditions.
  • Nonlinear function gains of global PDMs for BP were sensitive to sympathetic blockade.

Conclusions:

  • Very low frequency global PDMs of blood pressure show potential as functional biomarkers for sympathetic neurovascular dysfunction.
  • These findings may aid in understanding conditions like autonomic failure, stroke, and traumatic brain injury.