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Related Concept Videos

Neural Control of Respiration01:18

Neural Control of Respiration

The neural regulation of respiration is a meticulously coordinated process primarily controlled by the respiratory centers located within the brainstem. These centers, composed of specialized neurons, transmit nerve impulses that control the contraction and relaxation of our respiratory muscles.
Respiratory Centers in the Brainstem
Two primary areas comprise the respiratory center: the medullary respiratory center in the medulla oblongata and the pontine respiratory group in the pons. The...
Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
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Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this principle...
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Pulse Oximetry

Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
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Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

Assessment of Ventilation II: Respiratory Depth and Rhythm

Respiratory Depth
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
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Stages of General Anesthesia01:22

Stages of General Anesthesia

Various sedation levels offer significant advantages in facilitating procedural interventions for patients undergoing medical or invasive surgical procedures. These levels span from anxiolysis to general anesthesia, providing a spectrum of sedative effects to cater to specific patient needs. Anxiolysis reduces anxiety and is achieved through minimal sedation, enabling patients to remain awake and responsive while feeling more at ease during the procedure. This level can benefit minor...
Respiratory System Abnormal Finding II: Palpation and Auscultation01:31

Respiratory System Abnormal Finding II: Palpation and Auscultation

In assessing respiratory abnormalities, palpation and auscultation are critical tools for detecting and interpreting various pathophysiological changes. These techniques provide insight into underlying disorders by evaluating tactile sensations and sounds produced by the respiratory system.
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Related Experiment Video

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Using Wavelet Entropy to Demonstrate how Mindfulness Practice Increases Coordination between Irregular Cerebral and Cardiac Activities
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Wavelet transform cardiorespiratory coherence detects patient movement during general anesthesia.

Christopher J Brouse1, Walter Karlen, Dorothy Myers

  • 1Department of Electrical & Computer Engineering, University of British Columbia, Vancouver, BC, Canada. chrisb@ece.ubc.ca

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|January 19, 2012
PubMed
Summary

A new wavelet transform cardiorespiratory coherence (WTCRC) algorithm shows promise for monitoring pain (nociception) during anesthesia. This noninvasive tool effectively detected patient movement, indicating potential for improved anesthesia monitoring.

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Published on: September 3, 2021

Area of Science:

  • Anesthesiology and Perioperative Medicine
  • Biomedical Engineering
  • Physiological Monitoring

Background:

  • Heart rate variability (HRV) offers a potential noninvasive method for assessing nociception during general anesthesia.
  • Current monitoring methods may not fully capture nociceptive processing.
  • A novel algorithm, wavelet transform cardiorespiratory coherence (WTCRC), has been developed to quantify heart rate and respiration coupling.

Purpose of the Study:

  • To evaluate the efficacy of the WTCRC algorithm in detecting nociception, indicated by movement events, in pediatric patients under general anesthesia.
  • To assess the sensitivity of WTCRC in identifying patient responses to noxious stimuli during surgery.

Main Methods:

  • A novel WTCRC algorithm was used to estimate linear coupling between heart rate and respiration.
  • WTCRC values, ranging from 0 (strong nociception) to 1 (no nociception), were analyzed.
  • Sixty movement events in 39 pediatric patients were analyzed using WTCRC in a 30-second window, with a 95% significance level (0.7) determined via Monte Carlo simulations.

Main Results:

  • The WTCRC algorithm demonstrated the ability to detect movement events indicative of nociception.
  • Sensitivity for movement detection ranged from 95% using minimum WTCRC to 65% using average WTCRC.
  • The algorithm successfully identified nociception below the 0.7 significance threshold.

Conclusions:

  • The WTCRC algorithm shows significant promise as a noninvasive tool for monitoring nociception during general anesthesia.
  • Utilizing only heart rate and respiration data, WTCRC offers a novel approach to perioperative patient monitoring.
  • Further research may validate WTCRC for real-time nociception assessment in clinical settings.