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Related Concept Videos

Mechanical Ventilation I: Indication and Settings01:29

Mechanical Ventilation I: Indication and Settings

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Mechanical ventilation is a life-saving technique for managing acute respiratory failure and other respiratory complications. The process involves using a machine known as a ventilator to supply oxygen to the lungs and assist in removing carbon dioxide. It serves as a bridge to long-term mechanical ventilation or a temporary measure until ventilatory support is discontinued. The ventilator can maintain this function for a prolonged period, providing critical support for patients until they can...
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Mechanical Ventilation III: Noninvasive Ventilation01:23

Mechanical Ventilation III: Noninvasive Ventilation

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Noninvasive positive-pressure ventilation (NIPPV), continuous positive airway pressure (CPAP), and bilevel positive airway pressure (BiPAP) are essential methods in respiratory care. These ventilation techniques offer unique benefits for patients with various respiratory conditions, providing adequate support without requiring intubation. Let's explore how each method is crucial in improving patient outcomes and enhancing respiratory therapy.
Noninvasive Positive-Pressure Ventilation...
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Mechanical Ventilation II: Invasive Ventilation01:23

Mechanical Ventilation II: Invasive Ventilation

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Ventilators are essential medical equipment used to aid patients with respiratory difficulties. Their primary function is to assist or replace spontaneous breathing by providing mechanical ventilation. There are two general classes of mechanical ventilators: negative-pressure and positive-pressure ventilators.
Negative-Pressure Ventilators
Negative-pressure ventilators create a vacuum around the chest or body to draw air into the lungs, simulating breathing. This method does not require an...
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Ventilatory Modes01:14

Ventilatory Modes

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Mechanical ventilators are life-saving devices that support or replace spontaneous breathing. They deliver breaths to patients through varying methods known as ventilator modes. Understanding these modes is critical for healthcare providers managing patients with respiratory failure.
There are three ventilatory modes: full support, partial support, and spontaneous. These are described below.
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Full support modes include controlled mechanical ventilation, continuous mandatory...
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Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

Assessment of Ventilation II: Respiratory Depth and Rhythm

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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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Factors Affecting Pulmonary Ventilation01:19

Factors Affecting Pulmonary Ventilation

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Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
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Related Experiment Video

Updated: Jan 7, 2026

Author Spotlight: Unraveling the Impact of Mechanical Ventilation on Diaphragm Function and Patient Outcomes
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Mechanical ventilation patterns and outcomes in patients with right ventricular (RV) dysfunction: A cohort study.

Elizabeth Joyce1, Vincent D Marshall2, Aaron Lopacinski1

  • 1University of Michigan, Department of Internal Medicine, United States of America.

Heart & Lung : the Journal of Critical Care
|December 29, 2025
PubMed
Summary

Lung-protective ventilation (LPV) in right ventricular (RV) failure patients improved survival, though low starting positive end-expiratory pressure (PEEP) did not significantly impact outcomes. Most patients received LPV, but few met low PEEP guidelines.

Keywords:
Cardiac intensive care unitLung-protective ventilationMechanical ventilationRight heart failureRight ventricular dysfunction

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Area of Science:

  • Critical Care Medicine
  • Cardiology
  • Mechanical Ventilation

Background:

  • Lung-protective ventilation (LPV) with low tidal volume (TV) and plateau pressure (Pplat) improves mortality.
  • Right ventricular (RV) failure management with invasive mechanical ventilation (IMV) lacks extensive data.
  • ACC guidelines recommend LPV and low positive end-expiratory pressure (PEEP) for RV failure.

Purpose of the Study:

  • To describe IMV patterns in cardiac ICU patients with RV dysfunction.
  • To compare IMV practices against ACC Critical Care Working Group recommendations.
  • To evaluate the impact of LPV on two-year survival in this population.

Main Methods:

  • Retrospective, single-center study of intubated cardiac ICU patients with RV dysfunction (2017-2022).
  • Included patients with RV dysfunction confirmed by echocardiography and requiring fraction of inspired oxygen ≥50%.
  • Collected data on median PEEP in the initial 24 hours and subsequent measurements during IMV or 28 days.

Main Results:

  • 77.6% of patients (2014/2594) met LPV criteria (TV <8ml/kg, Pplat <30cmH2O).
  • LPV was significantly associated with decreased two-year mortality (HR 0.2, p < 0.001).
  • Only 42.4% (59/139) received starting PEEP ≤5cmH2O, which showed no association with survival.

Conclusions:

  • Most RV dysfunction patients received LPV, aligning with guidelines, but few had low starting PEEP.
  • LPV demonstrated a significant survival benefit at two years.
  • Low starting PEEP did not show a significant positive or negative association with two-year survival.