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Related Concept Videos

Acute Respiratory Failure-III01:30

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-I01:21

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,...
Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

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:
Pneumonia III: Complications and Assessment01:30

Pneumonia III: Complications and Assessment

Pneumonia poses the potential for numerous complications that warrant consideration. These complications include the following:
Acute Respiratory Failure-V01:29

Acute Respiratory Failure-V

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...
Acute Respiratory Failure-IV01:23

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...

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Manual Muscle Testing: A Method of Measuring Extremity Muscle Strength Applied to Critically Ill Patients
09:44

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Published on: April 12, 2011

Weakness on the intensive care unit.

R S Howard1, S V Tan, W J Z'Graggen

  • 1National Hospital for Neurology and Neurosurgery, London, UK. robin.howard@uclh.org

Practical Neurology
|September 18, 2008
PubMed
Summary
This summary is machine-generated.

Critically ill patients often experience profound weakness, making ventilator weaning challenging. Critical illness polyneuropathy and critical illness myopathy are the most common causes of this weakness.

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Last Updated: Jun 30, 2026

Manual Muscle Testing: A Method of Measuring Extremity Muscle Strength Applied to Critically Ill Patients
09:44

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Published on: April 12, 2011

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10:38

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Area of Science:

  • Critical care medicine
  • Neurology
  • Intensive care unit (ICU) management

Background:

  • Patients recovering from critical illness frequently exhibit profound weakness.
  • This weakness complicates ventilator weaning and is often difficult to assess due to severity and potential encephalopathy.

Purpose of the Study:

  • To outline a systematic approach for evaluating weakness in critically ill patients.
  • To identify the primary causes of neuromuscular complications in the ICU setting.

Main Methods:

  • Meticulous patient review, including assessment of septic, hypoxic, and metabolic derangements.
  • Detailed analysis of medication dosage and duration (antibiotics, neuromuscular blockers, sedatives).
  • Exclusion of primary neurological causes or intercurrent events.

Main Results:

  • Critical illness polyneuropathy (CIP) is an acute axonal neuropathy associated with sepsis or multi-organ failure.
  • Critical illness myopathy (CIM) is identified as the most frequent cause of critical care-related weakness.
  • Neuromuscular junction blocking agents and steroid use are implicated in CIP development.

Conclusions:

  • A thorough evaluation is crucial for diagnosing weakness in critical care survivors.
  • CIP and CIM are the principal neuromuscular complications leading to prolonged critical illness and ventilator dependence.
  • Early identification and management of these conditions are essential for patient recovery.