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Beyond life: Exploring hemodynamic patterns in postmortem mice brains.

Anton Sdobnov1, Vassiliy Tsytsarev2, Gennadi Piavchenko3

  • 1Optoelectronics and Measurement Techniques, University of Oulu, Oulu, Finland.

Journal of Biophotonics
|May 7, 2024
PubMed
Summary
This summary is machine-generated.

This study visualizes postmortem cerebral blood flow in mice using Laser Speckle Contrast Imaging (LSCI). It reveals blood flow decay and relocation patterns, offering insights into brain activity after cardiac arrest.

Keywords:
blood flowbrain microcirculationcontinuous wavelet transformlaser speckle contrastnon‐negative matrix factorizationpostmortem

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Area of Science:

  • Neuroscience
  • Physiology
  • Medical Imaging

Background:

  • Cerebral blood flow dynamics postmortem are not fully understood.
  • Understanding these dynamics may offer insights into consciousness and perception.
  • Cardiac arrest leads to complex physiological changes in the brain.

Purpose of the Study:

  • To visualize and analyze cerebral blood flow changes in mice after cardiac arrest.
  • To investigate temporal blood flow variations and microcirculation decay postmortem.
  • To explore potential hemodynamic synchronization patterns in the dying brain.

Main Methods:

  • Laser Speckle Contrast Imaging (LSCI) for real-time blood flow visualization.
  • Fast Fourier Transform (FFT) for analyzing blood flow decay.
  • Continuous Wavelet Transform (CWT) for identifying hemodynamic synchronization.
  • Non-negative Matrix Factorization (NMF) for image segmentation and analysis.

Main Results:

  • Temporal blood flow variations were observed across the brain surface for hours postmortem.
  • FFT analysis showed a decay in blood flow and microcirculation after death.
  • CWT identified potential cerebral hemodynamic synchronization patterns.
  • NMF revealed structural subcomponent alterations in blood flow over time.
  • Primary postmortem activity was noted in olfactory bulbs, with subsequent microflow relocation to cortical regions via the superior sagittal sinus.

Conclusions:

  • The integrated approach of LSCI, FFT, CWT, and NMF provides a comprehensive tool for studying postmortem cerebral blood flow.
  • This methodology opens new avenues for exploring phenomena related to consciousness and perception at the end of life.
  • Findings highlight specific patterns of cerebral hemodynamic activity and blood flow redistribution following cardiac arrest.