Related Experiment Video
Updated: Jul 28, 2026

09:58
A Reversible, Non-invasive Method for Airway Resistance Measurements and Bronchoalveolar Lavage Fluid Sampling in Mice
Published on: April 13, 2010
Reactive airways dysfunction syndrome (RADS): fact or fantasy?
1Division of Allergy and Clinical Immunology, Oregon Health Sciences University, Portland 97201-3098, USA.
Allergy
|March 29, 2000
Summary
Reactive Airways Dysfunction Syndrome (RADS) appears to be a distinct condition, not just worsened airway hyperresponsiveness. However, evidence for "low-level RADS" is currently weak and requires more robust data.
Area of Science:
- Pulmonary Medicine
- Occupational Health
Background:
- Reactive Airways Dysfunction Syndrome (RADS) is a condition characterized by airway hyperresponsiveness.
- The distinction between RADS and exacerbation of pre-existing conditions is debated.
- Limited data exists on the concept of
- low-level RADS
- .
Purpose of the Study:
- To evaluate the evidence supporting RADS as a distinct syndrome.
- To assess the validity of claims regarding "low-level RADS".
Main Methods:
- Review of existing scientific literature and evidence.
- Critical analysis of anecdotal reports versus empirical data.
Main Results:
- Current evidence strongly suggests RADS is a distinct syndrome.
- RADS is not merely an exacerbation of pre-existing airway hyperresponsiveness.
- Data supporting "low-level RADS" is anecdotal and lacks scientific rigor.
Conclusions:
- RADS is recognized as a unique clinical entity.
- Further research is needed to fully elucidate the pathogenesis of RADS.
- Claims of "low-level RADS" should be approached with caution due to insufficient evidence.
Related Concept Videos
Pulmonary Cycle: Exhalation
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...
Acute Respiratory Failure-I
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,...
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,...
Acute Respiratory Failure-III
Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without causing...
Acute Respiratory Failure-IV
Respiratory failure can manifest suddenly or gradually, characterized by a rapid decline in PaO2 and a rapid rise in PaCO2. This situation indicates a severe respiratory problem that may quickly become a life-threatening emergency. One of the early signs of hypoxemic Acute Respiratory Failure (ARF) is a change in mental status due to the brain's sensitivity to oxygen levels and changes in acid-base balance. Symptoms such as restlessness, confusion, and agitation suggest inadequate oxygen...
Rheumatic Heart Disease I: Introduction
Rheumatic heart disease or RHD is a chronic condition that results from rheumatic fever, causing permanent damage to the heart valves.Etiology and Risk FactorsIt primarily arises from rheumatic fever, an inflammatory disease that can develop after untreated or inadequately treated group A streptococcal (GAS) pharyngitis. Streptococcus spreads through direct contact with oral or respiratory secretions. While the bacteria are the causative agents, factors like malnutrition, overcrowding, poor...
Asthma I: Introduction
Asthma is a chronic inflammatory disorder of the airways characterized by variable airflow obstruction and heightened bronchial responsiveness to a wide range of triggers. The underlying inflammation leads to airway swelling, mucus hypersecretion, and smooth muscle constriction, all of which narrow the airway lumen and impede airflow. Clinically, asthma presents with recurrent episodes of wheezing, shortness of breath, chest tightness, and coughing, symptoms that typically vary in intensity and...

