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Related Concept Videos

Classification of Illness01:17

Classification of Illness

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The meaning of illness is individualized to each person who experiences an alteration in health. In contrast, disease is a medical term indicating a pathological change in the structure and function of the body or mind. It is a condition that has specific symptoms and boundaries.
An illness is a response to a disease in which the person's level of functioning is changed compared with a previous level. The general classification of illness includes acute and chronic.
Acute illness is severe...
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Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

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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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Factors Affecting Illness01:18

Factors Affecting Illness

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When a person's physical, emotional, intellectual, social development or spiritual functioning is compromised, this deviation from a healthy normal state is called illness. Illness creates stress that in turn harms individuals. Irritation, anger, denial, hopelessness, and fear are behavioral and emotional changes an individual experiences in the phases of illness. A variety of factors influence a person's health and well-being.
For instance, risk factors are connected to illness,...
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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-III01:30

Acute Respiratory Failure-III

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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...
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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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Related Experiment Video

Updated: Oct 20, 2025

Author Spotlight: Evaluating the Adjuvant Efficacy and Safety of Angong Niuhuang Pill in Viral Encephalitis Treatment
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COVID-19 Critical Illness: A Data-Driven Review.

Jennifer C Ginestra1,2, Oscar J L Mitchell1,3, George L Anesi1,2

  • 1Division of Pulmonary, Allergy and Critical Care Medicine, Hospital of the University of Pennsylvania, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania 19104, USA; email: jennifer.ginestra@pennmedicine.upenn.edu, oscar.mitchell@pennmedicine.upenn.edu, george.anesi@pennmedicine.upenn.edu, jason.christie@pennmedicine.upenn.edu.

Annual Review of Medicine
|September 14, 2021
PubMed
Summary

The COVID-19 pandemic challenged critical care, with acute respiratory distress syndrome (ARDS) being common. Improved familiarity and evidence-based care have reduced mortality rates for critically ill COVID-19 patients.

Keywords:
ARDSCOVID-19acute hypoxemic respiratory failureacute respiratory distress syndromecritical caremechanical ventilationnoninvasive respiratory support

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Area of Science:

  • Critical care medicine
  • Infectious diseases
  • Pulmonology

Background:

  • The COVID-19 pandemic presented significant challenges to critical care, including high demand for intensive care unit (ICU) resources.
  • A substantial proportion of hospitalized COVID-19 patients develop critical illness, frequently manifesting as acute hypoxemic respiratory failure or acute respiratory distress syndrome (ARDS).

Purpose of the Study:

  • To review the challenges and management strategies for critically ill COVID-19 patients.
  • To discuss the role of respiratory support and mechanical ventilation in COVID-19 critical illness.

Main Methods:

  • Review of current literature and clinical practices regarding COVID-19 critical care.
  • Analysis of common organ failures and prognostic factors in severe COVID-19 cases.

Main Results:

  • Acute hypoxemic respiratory failure, often presenting as ARDS, is the predominant organ failure in severe COVID-19.
  • Noninvasive respiratory support is increasingly utilized, but optimal intubation timing remains a challenge.
  • Management of mechanically ventilated COVID-19 patients is similar to non-COVID-19 ARDS, with organ failure indicating a poor prognosis.

Conclusions:

  • Mortality rates for critical COVID-19 have decreased due to increased understanding, data-driven treatments, and adherence to evidence-based critical care protocols.
  • Continued research and adaptation of critical care strategies are essential for managing future pandemics.