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Related Concept Videos

Exercise Stress Test01:26

Exercise Stress Test

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Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
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Physical Assessment of the Respiratory Tract II: Inspection01:27

Physical Assessment of the Respiratory Tract II: Inspection

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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 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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Assessment of the Cardiovascular System II: Inspection01:29

Assessment of the Cardiovascular System II: Inspection

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Inspection is the initial step in assessing the cardiovascular system. It involves a detailed visual examination that provides crucial information about a patient's circulatory and cardiac health. This systematic process, conducted from head to toe, helps identify signs of cardiovascular conditions by observing physical appearance, skin and mucous membranes, jugular and carotid pulsations, chest symmetry, and the condition of the extremities.
Head and Neck
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Assessment of the Cardiovascular System III: Palpation01:27

Assessment of the Cardiovascular System III: Palpation

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Palpation involves feeling the body to evaluate texture, size, consistency, and tenderness for assessing cardiovascular health. The following steps are organized in a head-to-toe order:
Jugular Venous Pressure (JVP) Measurement
Position the patient at a thirty- to forty-five-degree angle or in a semi-fowler's position. Look for the highest point of pulsation in the internal jugular vein and measure the vertical distance to the angle of Loius or sternal angle. A normal JVP is 3-4 cm above...
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Assessment of Airway, Skin Color, and Use of Accessory Muscles01:30

Assessment of Airway, Skin Color, and Use of Accessory Muscles

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A thorough assessment of respiratory health is paramount in clinical settings to identify and manage respiratory distress and ensure adequate oxygenation. This article elaborates on the critical aspects of respiratory evaluation, including airway assessment, skin color examination, and the observation of accessory muscle use, which are integral to effectively diagnosing and managing patients with respiratory conditions.
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The initial evaluation of a patient's respiratory system...
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Related Experiment Video

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Integration of Brain Tissue Saturation Monitoring in Cardiopulmonary Exercise Testing in Patients with Heart Failure
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An objective method to detect sighs during cardio-pulmonary exercise testing.

Léon Genecand1,2, Thomas Nibler3, Ivan Guerreiro4,5

  • 1Service de Pneumologie, Département de Médecine, Hôpitaux Universitaires de Genève, Genève, Switzerland. leon.genecand@hug.ch.

Scientific Reports
|October 21, 2025
PubMed
Summary

Researchers developed an automated method to objectively quantify excessive sighs during cardiopulmonary exercise testing (CPET). This breakthrough aids in diagnosing dysfunctional breathing (DB) and understanding its link to persistent dyspnea after COVID-19.

Keywords:
Abnormal breathing patternCardio-pulmonary exercise testingDysfunctional breathingSighs

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Area of Science:

  • Pulmonary Medicine
  • Respiratory Physiology
  • Medical Technology

Background:

  • Excessive sighing is a recognized form of dysfunctional breathing (DB).
  • Cardiopulmonary exercise testing (CPET) subjectively assesses sighs but lacks automated quantification.
  • There is a need for objective methods to measure sighs during CPET.

Purpose of the Study:

  • To develop and validate an automated method for quantifying sighs during CPET.
  • To enable objective assessment of dysfunctional breathing patterns.

Main Methods:

  • Utilized two Swiss cohorts (n=48 derivation, n=77 validation) of patients with post-COVID-19 dyspnea undergoing CPET.
  • Developed an automated detection algorithm using a rolling median filter and tidal volume (VT) spike analysis.
  • Validated automated sigh detection against visual analysis by experienced raters using high-resolution data.

Main Results:

  • The automated method demonstrated high accuracy, with 199 out of 203 detected spikes (98%) corresponding to sighs in the validation cohort.
  • High inter-rater reliability was achieved (Cohen's Kappa = 0.89).
  • The developed method effectively quantifies sighs during CPET.

Conclusions:

  • A simple, automated method for objective sigh quantification during CPET has been successfully developed.
  • This tool can facilitate establishing normative sigh values and exploring sigh-symptom associations in DB patients.
  • The method holds potential for improved diagnosis and management of dysfunctional breathing.