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Related Concept Videos

Toxic Reactions: Overview01:26

Toxic Reactions: Overview

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When toxic substances penetrate the human body, they disseminate to various tissues, undergoing metabolic changes. This process yields reactive metabolites that may covalently bind with specific target molecules, resulting in toxicity.
Toxicity falls into two primary categories: local and systemic.
Local toxicity appears at the exposure site, such as protein denaturation caused by caustic substances.
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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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Asthma-I: Introduction01:29

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Asthma is a chronic respiratory ailment that requires careful management due to its varying symptoms and influencing factors. It is characterized by airway inflammation, bronchial hyperresponsiveness, and reversible airflow obstruction, leading to symptoms like wheezing, shortness of breath, chest tightness, and coughing. The symptom frequency and intensity may vary considerably over time. It is also linked to immune system responses to allergens and irritants, highlighting the complex...
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Respiratory Assessment: Purpose and Indications01:19

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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:
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Chemical Factors Affecting Respiration Centers01:31

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Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
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Physical Assessment of the Respiratory Tract I: Health History01:28

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Physical assessment of the respiratory tract is critical to patient care. It allows healthcare professionals to identify and manage various respiratory conditions. The process involves a combination of subjective and objective data collection.
Subjective Data
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Assessment of the Cytotoxic and Immunomodulatory Effects of Substances in Human Precision-cut Lung Slices
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Assessment of the Cytotoxic and Immunomodulatory Effects of Substances in Human Precision-cut Lung Slices

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Developing a framework for assessing chemical respiratory sensitization: A workshop report.

Colin M North1, Janine Ezendam2, Jon A Hotchkiss3

  • 1ExxonMobil Biomedical Sciences, Inc., Annandale, NJ, USA.

Regulatory Toxicology and Pharmacology : RTP
|July 12, 2016
PubMed
Summary
This summary is machine-generated.

Identifying respiratory sensitizers is crucial for health. This workshop proposed a tiered framework and weight-of-evidence approach for better hazard assessment and risk management.

Keywords:
FrameworkHazard identificationInhalationIn vitroIn vivoRespiratory sensitizationSensitizationSkinTiered approachWorkshop report

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Area of Science:

  • Occupational Health and Toxicology
  • Immunology
  • Chemical Risk Assessment

Background:

  • Respiratory tract sensitization poses significant health risks, yet validated methods for hazard identification and characterization are lacking.
  • Current understanding of respiratory sensitization mechanisms, particularly the full immunological pathways, remains incomplete.
  • Existing non-animal testing approaches for skin sensitization offer insights but require adaptation for respiratory hazards.

Framework:

  • A workshop convened experts to discuss the state of science in respiratory sensitizer hazard assessment.
  • Key discussion points included identifying information for developing validated methods and addressing regulatory needs.
  • Participants agreed on a predominant Th2 immunological mechanism and critical steps in respiratory sensitization.

Implementation:

  • Progress in non-animal testing methods (in vitro, omics, in silico) for skin sensitization was acknowledged.
  • Challenges remain in addressing both the induction and elicitation phases of respiratory sensitization.
  • A lack of a unifying dose metric complicates the interpretation of dosimetry across different exposure scenarios.

Implications:

  • Future strategies require a tiered framework for respiratory sensitizer assessment, moving towards a weight-of-evidence approach.
  • Further research is needed, including an agreed list of respiratory sensitizers and asthmagens.
  • Distinguishing between immune-mediated and non-immunological mechanisms is essential for accurate risk assessment.