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Related Concept Videos

Assessment of Respiration01:23

Assessment of Respiration

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The respiratory system's basic structures and primary functions lay the foundation for nurses' comprehensive respiratory assessments. This assessment includes subjective and objective data to gauge the patient's respiratory health.
Subjective Assessment: Nurses interview the patient to gather information directly during the subjective assessment. It includes questions about the individual's medical history, medications, and symptoms, focusing on past respiratory conditions like...
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Serum Laboratory Studies, Stool Test, Breath Test01:30

Serum Laboratory Studies, Stool Test, Breath Test

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Gastrointestinal (GI) diagnostic studies are pivotal in confirming, ruling out, diagnosing, or staging various diseases, including cancers. Following diagnosis, allocating time for discussions with the patient and providing informational resources is crucial. Diagnostic assessments of the GI tract often occur in outpatient settings like endoscopy suites or GI labs. Preparation for these tests may include dietary restrictions, fasting, liquid bowel preparations, laxatives, enemas, and the...
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Respiratory Assessment: Purpose and Indications01:19

Respiratory Assessment: Purpose and Indications

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Respiratory assessment is a cornerstone of nursing assessments, crucial for the early detection of patient deterioration. This evaluation transcends routine procedures, representing a critical skill nurses must master to ensure optimal patient care.
Objectives and Importance:
The primary goal of respiratory assessment is to evaluate patients at early risk of clinical deterioration. Since respiratory distress often precedes other signs of declining health, breathing patterns and sounds become a...
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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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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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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: Oct 17, 2025

Breath Collection from Children for Disease Biomarker Discovery
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COVID-19 screening using breath-borne volatile organic compounds.

Haoxuan Chen1, Xiao Qi2, Lu Zhang1

  • 1State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing, People's Republic of China.

Journal of Breath Research
|October 8, 2021
PubMed
Summary

A new breath test using volatile organic compounds (VOCs) and machine learning can rapidly screen for COVID-19. This non-invasive method identifies specific VOC biomarkers in exhaled breath for quick point-of-care diagnosis.

Keywords:
COVID-19acetonebiomarkersexhaled breathmachine learningpropanolvolatile organic compounds (VOCs)

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Real-time Breath Analysis by Using Secondary Nanoelectrospray Ionization Coupled to High Resolution Mass Spectrometry
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Area of Science:

  • Biochemistry
  • Medical Diagnostics
  • Computational Biology

Background:

  • Rapid screening of COVID-19 is crucial for pandemic control.
  • Current methods like nucleic acid amplification tests are time-consuming and invasive.
  • There is a need for faster, non-invasive diagnostic tools.

Purpose of the Study:

  • To identify volatile organic compound (VOC) biomarkers in breath for COVID-19 screening.
  • To develop a machine learning model for rapid point-of-care diagnosis of COVID-19 using breath VOCs.
  • To evaluate the efficacy of breath VOC analysis in detecting COVID-19, including cases with false-negative PCR tests.

Main Methods:

  • Utilized a commercial gas chromatograph-ion mobility spectrometer to analyze exhaled breath.
  • Measured levels of specific VOCs, including propanol and acetone, in different subject groups.
  • Applied supervised machine learning models (SVM, GBM, Random Forests) to discriminate between COVID-19 patients, respiratory infection patients, and controls.
  • Validated the models' precision in identifying COVID-19 and other respiratory infections.

Main Results:

  • Elevated propanol levels were detected in COVID-19 and respiratory infection patients compared to controls.
  • Lower acetone levels were observed in COVID-19 patients.
  • Machine learning models accurately discriminated COVID-19 from controls (91-100% precision) and respiratory infections (91-100% precision).
  • Models could identify a COVID-19 patient with a false-negative PCR test.
  • The entire breath test and analysis process takes 10 minutes.

Conclusions:

  • Breath-borne VOCs, analyzed by machine learning, offer a novel approach for non-invasive, rapid COVID-19 screening.
  • This technology enables point-of-care testing in diverse settings.
  • The method shows potential for early detection and management of respiratory infections.