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Related Concept Videos

Assessment of Ventilation I: Respiratory Rate01:20

Assessment of Ventilation I: Respiratory Rate

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Assessment of Ventilation
A Ventilation assessment is critical for monitoring a patient's health status. Respiration, one of the most accessible vital signs, provides insights into the function of numerous body systems and can indicate serious health issues, such as brainstem injuries from head trauma.
Critical Guidelines for Assessing Ventilation:
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Pressure Relationships in Thoracic Cavity01:24

Pressure Relationships in Thoracic Cavity

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Breathing, otherwise known as pulmonary ventilation, is the process of air movement into and out of the lungs. The main mechanisms propelling pulmonary ventilation are atmospheric pressure (Patm), intra-pulmonary (Ppul ) or intra-alveolar pressure (Palv) within the alveoli, and intrapleural pressure (Pip) within the pleural cavity.
Breathing Mechanisms
Both intra-alveolar and intrapleural pressures rely on specific lung properties. The ability to breathe—allowing air to enter the lungs...
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Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

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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.
The Role of Diffusion in Respiration
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...
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Special considerations while measuring oxygen saturation01:19

Special considerations while measuring oxygen saturation

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Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention.
Ensuring accuracy in vital sign recordings while prioritizing patient comfort and minimizing anxiety is...
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Physical Assessment of the Respiratory Tract II: Inspection01:27

Physical Assessment of the Respiratory Tract II: Inspection

1.3K
Physical assessment of the respiratory tract through inspection is a crucial step in understanding the patient's respiratory health. It provides insights into the functioning of the respiratory system, the musculoskeletal structure, and even the patient's nutritional status. This comprehensive approach involves observing several vital aspects: chest configuration, breathing patterns, respiratory rates, skin color, and use of accessory muscles.
Chest Configuration
The chest configuration...
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Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

Assessment of Ventilation II: Respiratory Depth and Rhythm

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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.
To assess respiratory depth, observe the degree of chest excursion or movement:
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Related Experiment Video

Updated: Apr 11, 2026

Monitoring Lung Function with Electrical Impedance Tomography in the Intensive Care Unit
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Monitoring Lung Function with Electrical Impedance Tomography in the Intensive Care Unit

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Chest compression rate feedback based on transthoracic impedance.

Digna M González-Otero1, Sofía Ruiz de Gauna1, Jesus Ruiz1

  • 1Department of Communications Engineering, University of the Basque Country, UPV/EHU, 48013 Bilbao, Spain.

Resuscitation
|June 9, 2015
PubMed
Summary

A new algorithm accurately estimates chest compression (CC) rate using transthoracic impedance (TTI) signals from defibrillator pads. This technology can enhance cardiopulmonary resuscitation (CPR) quality in emergency settings.

Keywords:
Automated external defibrillatorBasic life supportCPR qualityChest compressionTransthoracic impedance

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Area of Science:

  • Cardiology
  • Emergency Medicine
  • Biomedical Engineering

Background:

  • Cardiopulmonary resuscitation (CPR) quality is crucial for cardiac arrest survival.
  • Feedback devices are recommended to improve CPR performance during resuscitation.

Purpose of the Study:

  • To assess a generic algorithm's feasibility for chest compression (CC) rate feedback.
  • To utilize transthoracic impedance (TTI) signals from defibrillation pads for CC rate analysis.

Main Methods:

  • Analyzed 180 episodes from three emergency services with different defibrillator models.
  • Developed an algorithm to compute CC-rate every 2s by analyzing TTI signals in the frequency domain.
  • Compared algorithm-derived CC-rate with a gold standard (compression force or ECG/TTI signals).

Main Results:

  • High mean sensitivity (96.3%) and positive predictive value (97.0%) for detecting CC intervals.
  • Estimated CC-rate error below 10% in 95.8% of episodes.
  • Accurate alarm generation for inadequate CC-rate (mean 98.2%) with no statistical difference from the gold standard.

Conclusions:

  • An accurate algorithm for CC-rate calculation and feedback using TTI signals was developed.
  • Potential integration into automated external defibrillators (AEDs) to improve basic-life-support CPR quality.