Overview
How is hypoxemic respiratory failure (type I) characterized?
How is hypercapnic respiratory failure (type II) characterized?
What are the differences between acute and chronic respiratory failure?
What is included in the workup of suspected respiratory failure?
What is the danger of hypoxemia in respiratory failure?
In which component of the respiratory system does respiratory failure originate?
What is the role of ventilatory capacity in the pathogenesis of respiratory failure?
Which processes for respiration are engaged in the pathogenesis of respiratory failure?
What is the role of gas exchange in the pathophysiology of respiratory failure?
What is the oxygen hemoglobin dissociation curve?
In which forms is carbon dioxide transported in the pathophysiology of respiratory failure?
What is the role of blood flow and ventilation in the pathophysiology of respiratory failure?
How is the alveolar-arterial PO2 gradient measured in the pathophysiology of respiratory failure?
What are the pathophysiologic mechanisms for hypoxemic respiratory failure?
What is the benefit of 100% oxygen for patients experiencing respiratory failure?
What is the role of shunt in the pathophysiology of respiratory failure?
What is an anatomic shunt in the pathophysiology of respiratory failure?
When is a shunt a cause of hypoxemia in respiratory failure?
How is arterial carbon dioxide tension (PaCO2) measured in the pathogenesis of respiratory failure?
What is the role of hypoventilation in the pathophysiology of respiratory failure?
How are the etiologies of respiratory failure categorized?
Which metabolic disorders of the central nervous system (CNS) lead to respiratory failure?
Which severe-upper airway disorders cause respiratory failure?
Which diseases of the alveoli can result in respiratory failure?
What are common causes of type I (hypoxemic) respiratory failure?
What are common causes of type II (hypercapnic) respiratory failure?
What is the overall prevalence of respiratory failure?
What are the racial predilections in incidence of respiratory failure?
What is the mortality rate for respiratory failure?
Presentation
How is respiratory failure diagnosed?
Which history findings suggest cardiogenic pulmonary edema resulting in respiratory failure?
What are the risk factors for respiratory failure following kidney transplantation?
What are the signs and symptoms of acute respiratory failure?
Which physical findings are characteristic of type I and type II respiratory failure?
What is the significance of a finding of cyanosis in suspected type I respiratory failure?
What may contribute to dyspnea in respiratory failure?
Which nervous system findings suggest respiratory failure?
What causes cor pulmonale occur in respiratory failure?
What are the diagnostic criteria for acute respiratory distress syndrome (ARDS)?
What are the categories of complications of acute respiratory failure (ARF)?
What are the pulmonary complications of acute respiratory failure (ARF)?
What are the cardiovascular complications of acute respiratory failure (ARF)?
What are the GI complications of acute respiratory failure (ARF)?
Which nosocomial infections are complications of respiratory failure?
Which complications are common in critically ill patients with respiratory failure?
What are the nutritional complications of acute respiratory failure (ARF)?
DDX
What radiographic finding suggests right-to-left shunting in respiratory failure?
When is early intubation indicated for respiratory failure?
What causes of hypercapnic respiratory failure (type II)?
What are the differential diagnoses for Respiratory Failure?
Workup
What is the role of arterial blood gas measurement in the diagnosis of respiratory failure?
What is the role of imaging in the diagnosis of respiratory failure?
How is the clinical diagnosis of respiratory failure confirmed?
What is the role of a CBC count in the diagnosis of respiratory failure?
What is the role of a chemistry panel in the evaluation of respiratory failure?
How is myocardial infarction excluded in the evaluation of respiratory failure?
What is the role of chest radiography in the diagnosis of respiratory failure?
What is the role of echocardiography in the diagnosis of respiratory failure?
What is the role of pulmonary function tests (PFTs) in the diagnosis of respiratory failure?
What is the role of the pulmonary capillary wedge pressure in the diagnosis of respiratory failure?
Treatment
What are the risks of oxygen therapy for respiratory failure?
What should be done once hypoxemia is corrected in patients with respiratory failure?
When is bed rest indicated in the treatment of respiratory failure?
Which specialist consultations are required for treatment of respiratory failure?
What is the first objective for treatment of respiratory failure?
When is inpatient care indicated for respiratory failure?
What is the role of endotracheal intubation in the treatment of respiratory failure?
How is coexistent hypercapnic respiratory failure and respiratory acidosis managed?
What are the benefits of mechanical ventilation in the treatment of respiratory failure?
What is the role of negative pressure ventilation in the treatment of respiratory failure?
What is the evolution of mechanical ventilators used for the treatment of respiratory failure?
Which variables are set for positive-pressure ventilation in respiratory failure?
What is volume-targeted (or volume preset) ventilation for respiratory failure?
What is pressure-targeted (or pressure preset) ventilation for respiratory failure?
How does endotracheal intubation mechanically ventilate patients with respiratory failure?
What is pressure support ventilation (PSV) for respiratory failure?
What is intermittent mandatory ventilation (IMV) for respiratory failure?
What is assist-control ventilation for respiratory failure?
What is volume-control ventilation for respiratory failure?
When is pressure-control ventilation indicated for respiratory failure?
What is pressure-control inverse-ratio ventilation (PCIRV) for respiratory failure?
What is patient-initiated (assisted) ventilation for respiratory failure?
How is a pressure triggering ventilator used to treat respiratory failure?
How is a flow triggering ventilator used to treat respiratory failure?
What is positive end-expiratory pressure (PEEP) ventilation for respiratory failure?
How is positive end-expiratory pressure (PEEP) used for treatment of respiratory failure?
What is the role of positive end-expiratory pressure (PEEP) in the treatment of respiratory failure?
What is the role of inspiratory flow in volume-targeted ventilation for respiratory failure?
Which flow patterns are commonly used in mechanical ventilation for respiratory failure?
What is the role of inspiratory flow in pressure-targeted ventilation for respiratory failure?
Which factors increase the risk of lung damage from mechanical ventilation for respiratory failure?
What is the benefit of low tidal volumes in the mechanical ventilation for respiratory failure?
How is the mode of ventilation selected for the treatment of respiratory failure?
What is the recommended ventilation regimen for patients with respiratory failure?
What is the traditional ventilation strategy for acute respiratory distress syndrome (ARDS)?
Why is the prone position beneficial in the treatment of acute respiratory distress syndrome (ARDS)?
How is severe dynamic hyperinflation treated in patients with respiratory failure?
When is measurement of end-inspiratory volume indicated in the treatment of respiratory failure?
When does asynchrony in the mechanical ventilation occur in the treatment of respiratory failure?
How is synchrony achieved during mechanical ventilation for respiratory failure?
How is patient-ventilator asynchrony minimized in the treatment of respiratory failure?
What are ventilation-related recommendations and suggestions for adults with COVID-19?
When is noninvasive ventilation (NIV) considered for the treatment of respiratory failure (ARF)?
How is weaning from mechanical ventilation initiated in patients with respiratory failure?
How might a weaning protocol be designed for patients with respiratory failure?
What is included in the long-term monitoring of respiratory failure?
Guidelines
Medications
Which medications are used in the treatment of respiratory failure?
Which medications in the drug class Beta2 Agonists are used in the treatment of Respiratory Failure?
Which medications in the drug class Nitrates are used in the treatment of Respiratory Failure?
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Bilateral airspace infiltrates on chest radiograph film secondary to acute respiratory distress syndrome that resulted in respiratory failure.
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Extensive left-lung pneumonia caused respiratory failure; the mechanism of hypoxia is intrapulmonary shunting.
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A 44-year-old woman developed acute respiratory failure and diffuse bilateral infiltrates. She met the clinical criteria for the diagnosis of acute respiratory distress syndrome. In this case, the likely cause was urosepsis.
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This patient developed acute respiratory failure that turned out to be the initial presentation of systemic lupus erythematosus. The lung pathology evidence of diffuse alveolar damage is the characteristic lesion of acute lupus pneumonitis.
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A Bilevel positive airway pressure support machine is shown here. This could be used in spontaneous mode or timed mode (backup rate could be set).
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Headgear and full face mask commonly are used as the interface for noninvasive ventilatory support.
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Bilevel positive airway pressure (BiPAP) and inspiratory positive airway pressure (IPAP) settings are shown. IPAP or expiratory positive airway pressure (EPAP) and frequency can be preset.
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Noninvasive ventilation with bilevel positive airway pressure for acute respiratory failure secondary to exacerbation of chronic obstructive pulmonary disease.
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Wave forms of a volume-targeted ventilator: Pressure, flow, and volume waveforms are shown with square-wave flow pattern. A is baseline, B is increase in tidal volume, C is reduced lung compliance, and D is increase in flow rate. All 3 settings lead to increase in peak airway pressures. Adapted from Spearman CB et al.
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The cause of respiratory failure may be suggested by spirometry.
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A 65-year-old man developed chronic respiratory failure secondary to usual interstitial pneumonitis. Loss of normal architecture is seen upon biopsy. Also seen are varying degrees of inflammation and fibrosis.
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Lung biopsy from a 32-year-old woman who developed fever, diffuse infiltrates seen on chest radiograph, and acute respiratory failure. The lung biopsy shows acute eosinophilic pneumonitis; bronchoscopy with bronchoalveolar lavage also may have helped reveal the diagnosis.
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Lung biopsy on this patient with acute respiratory failure and diffuse pulmonary infiltrates helped yield the diagnosis of pulmonary edema. Therefore, cardiogenic pulmonary edema should be excluded as the cause of respiratory failure prior to considering lung biopsy.
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Pressure-volume curve of a patient with acute respiratory distress syndrome (ARDS) on mechanical ventilation can be constructed. The lower and the upper ends of the curve are flat, and the central portion is straight (where the lungs are most compliant). For optimal mechanical ventilation, patients with ARDS should be kept between the inflection and the deflection point.
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Surgical lung biopsy was performed in the patient described in Image 3. The histology shows features of diffuse alveolar damage, including epithelial injury, hyperplastic type II pneumocytes, and hyaline membranes.