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Related Concept Videos

Pulmonary Cycle: Exhalation01:17

Pulmonary Cycle: Exhalation

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In terms of human respiration, the act of expelling air, known as exhalation (or expiration), operates on the principle of pressure gradients. During expiration, the pressure within the lungs exceeds that of the surrounding atmosphere. Under normal conditions, quiet breathing involves passive exhalation and is free of muscular contractions. This is because the exhalation process is driven by the natural elastic recoil of the lungs and chest wall, both of which have an inherent tendency to...
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Acute Respiratory Failure-II01:21

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Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
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Pneumonia III: Complications and Assessment01:30

Pneumonia III: Complications and Assessment

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Pneumonia poses the potential for numerous complications that warrant consideration. These complications include the following:
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Acute Respiratory Failure-I01:21

Acute Respiratory Failure-I

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Acute respiratory failure is a condition characterized by the inability of the lungs to perform their primary function: gas exchange. This failure leads to insufficient oxygen levels (hypoxemia) in the blood, elevated carbon dioxide levels (hypercapnia), or both, causing critical impairment in organ function.
Definition: It is defined by specific criteria based on blood gas measurements. Hypoxemia happens when the partial pressure of oxygen (PaO2) falls below 60 mmHg. At the same time,...
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Acute Respiratory Failure-V01:29

Acute Respiratory Failure-V

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The treatment for acute respiratory failure varies based on factors like the underlying cause, overall health, and severity. A collaborative healthcare team is essential for early detection, often through arterial blood gas analysis. Identifying the cause is the primary goal, with treatment strategies adjusted for ventilation/perfusion (V/Q) mismatch, shunting, or diffusion impairment.
Ensure that patients are monitored continuously for their response to therapy, including changes in...
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Pneumonia II: Pathophysiology01:29

Pneumonia II: Pathophysiology

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The pathophysiology of pneumonia involves the following steps:
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Related Experiment Video

Updated: Jun 22, 2025

An Improved and High Throughput Respiratory Syncytial Virus RSV Micro-neutralization Assay
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An Improved and High Throughput Respiratory Syncytial Virus RSV Micro-neutralization Assay

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SARS-CoV-2 and RSV bronchiolitis outcomes.

Donna R Mendez1, Krishna Paul1, Joan Richardson2

  • 1University of Texas Medical Branch: Galveston - Department of Emergency Medicine, 301 University Blvd, Galveston, TX 77555-1173, United States.

Heart & Lung : the Journal of Critical Care
|July 2, 2024
PubMed
Summary

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) bronchiolitis is associated with higher ICU admission risk compared to Respiratory Syncytial Virus (RSV). SARS-CoV-2 bronchiolitis outcomes were more severe during a second delayed RSV season.

Keywords:
BronchiolitisChildrenOutcomesRSVSARS-CoV-2

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Area of Science:

  • Virology
  • Infectious Diseases
  • Pulmonology

Background:

  • The COVID-19 pandemic introduced Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) bronchiolitis, a condition with limited existing literature.
  • Understanding SARS-CoV-2 bronchiolitis is crucial for managing respiratory infections during the pandemic.

Purpose of the Study:

  • To compare clinical outcomes of bronchiolitis caused by SARS-CoV-2 versus Respiratory Syncytial Virus (RSV).
  • To conduct a subgroup analysis of outcomes during two disrupted RSV seasons amidst the pandemic.

Main Methods:

  • Retrospective study utilizing the US TriNetX database from March 1, 2020, to January 1, 2023.
  • Employed propensity matching to control for confounding variables between patient groups.

Main Results:

  • After propensity matching 3,592 patients (1,796 per group), SARS-CoV-2 bronchiolitis showed increased risk for oxygen saturation ≤95% and ICU admission.
  • However, SARS-CoV-2 bronchiolitis had decreased risks for hospitalization, and respiratory rates ≥60 or ≥70 compared to RSV.
  • During the second delayed RSV season, RSV bronchiolitis patients had a lower risk of ICU admission than SARS-CoV-2 patients.

Conclusions:

  • Patients with SARS-CoV-2 bronchiolitis experienced more severe outcomes, evidenced by a higher risk of ICU admission.
  • SARS-CoV-2 bronchiolitis demonstrated greater severity than RSV bronchiolitis during the second delayed RSV season.