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Related Concept Videos

Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

923
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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Acute Respiratory Failure-IV01:23

Acute Respiratory Failure-IV

459
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...
459
Acute Respiratory Failure-V01:29

Acute Respiratory Failure-V

374
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...
374
Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

Assessment of Ventilation II: Respiratory Depth and Rhythm

2.3K
Respiratory Depth
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:
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Acute Respiratory Failure-I01:21

Acute Respiratory Failure-I

715
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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Assessment of Ventilation I: Respiratory Rate01:20

Assessment of Ventilation I: Respiratory Rate

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Assessment of Ventilation
A Ventilation assessment is critical for monitoring a patient's health status. Respiration, one of the most accessible vital signs, provides insights into the function of numerous body systems and can indicate serious health issues, such as brainstem injuries from head trauma.
Critical Guidelines for Assessing Ventilation:
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Updated: Dec 25, 2025

Surfactant Depletion Combined with Injurious Ventilation Results in a Reproducible Model of the Acute Respiratory Distress Syndrome ARDS
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Surfactant Depletion Combined with Injurious Ventilation Results in a Reproducible Model of the Acute Respiratory Distress Syndrome ARDS

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Microcirculatory dysfunction and dead-space ventilation in early ARDS: a hypothesis-generating observational study.

Gustavo A Ospina-Tascón1,2, Diego F Bautista3, Humberto J Madriñán3

  • 1Department of Intensive Care, Fundación Valle del Lili - Universidad ICESI, Av. Simón Bolívar Cra. 98, Cali, Valle del Cauca, Colombia. gusospin@gmail.com.

Annals of Intensive Care
|March 27, 2020
PubMed
Summary
This summary is machine-generated.

In acute respiratory distress syndrome (ARDS), impaired microcirculation is linked to increased dead-space ventilation (VD/VT). This study found sublingual microcirculatory changes correlate with VD/VT, suggesting a potential mechanism for ventilation/perfusion mismatching.

Keywords:
Acute respiratory distress syndromeDead-space ventilationMicrocirculationMicrocirculatory blood flowVD/VTVentilation/perfusion mismatch

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Area of Science:

  • Critical Care Medicine
  • Respiratory Physiology
  • Microcirculation Research

Background:

  • Ventilation/perfusion (V/Q) inequalities are key in acute respiratory distress syndrome (ARDS), impairing gas exchange.
  • The mechanisms behind increased dead-space ventilation (VD/VT) in ARDS are not fully understood.
  • Altered microcirculation, common in severe inflammation, may influence V/Q mismatching and VD/VT in early ARDS.

Purpose of the Study:

  • To investigate the relationship between dynamic changes in VD/VT and sublingual microcirculatory blood flow in ARDS patients.
  • To determine if microcirculatory alterations contribute to ventilation/perfusion mismatching in early ARDS.

Main Methods:

  • Forty-two early ARDS patients were studied, with PEEP optimized for respiratory compliance.
  • Volumetric capnography measured VD/VT, while sidestream dark-field imaging assessed sublingual microcirculation (PPV, MFI).
  • Measurements were taken at baseline and 24 hours post-recruitment maneuver and stabilization.

Main Results:

  • Percentage of small vessels perfused (PPV) and microcirculatory flow index (MFI) were inversely correlated with VD/VT at baseline and 24 hours.
  • Changes in PPV over 24 hours significantly correlated with simultaneous changes in VD/VT.
  • No significant correlation was found between VD/VT and respiratory mechanics or oxygenation parameters.

Conclusions:

  • Increased heterogeneity of sublingual microcirculatory blood flow is associated with elevated VD/VT in ARDS.
  • Microcirculatory dysfunction may play a role in dead-space ventilation in ARDS.
  • Future research is needed to establish a causal link between microcirculatory dysfunction and VD/VT in ARDS.